For prevention should irrigate the land properly. Moisture is favorable for the spread of most insects, but only dry soil is suitable for a tick. Garlic or onion infusions (10 l of water and 200 g of husk) will cope with the destruction of colonies. It is necessary to spray bushes 4 times a season.
This disease can be widespread, and spread by foci in vegetable gardens and greenhouses without proper heating. Fungal diseases of cucumbers affect plantations at various points in their growth. The problem of fusarium is that the infection may not manifest itself externally until the plants enter the fruiting phase, when they begin to wilt and die. Anthracnose is expressed in yellow-brown spots
Mealy dew of cucumbers
The soil needs to be loosened and properly fertilized.
An effective and reliable way to control powdery mildew on cucumbers is spraying with Topaz. This tool can be used for the prevention of disease.
Treatment of cucumbers for peronosporoza - the most effective recommendationsAnd, of course, the plant itself must be sprayed on a green leaf. For this, Planriz, based on an extract from herbs, which prevents disease, is well suited.Of course, our breeders take measures not only to combat this disease, but also derive such plant varieties that will be more resistant to downy mildew. When buying seeds, pay attention to the description of the variety. Gardeners should independently take some measures to avoid the appearance of this disease.
Symptoms of the diseaseDetermine peronosporoz on cucumbers is easy. It is expressed in the form of massive brown and yellow spots on the foliage of the plant and affects it at all stages of development. Visually, peronosporosis in cucumbers you can see in the photo, laid out by gardeners on the Internet.
The most common disease of cucumber is powdery mildew. In addition, these plants also affect infections such as mosaic and root rot. Against each of them has its own methods of struggle, as well as preventive. Consider them in more detail.
To burn the tops and to process the earth Hom
Gluttonous larvae of the whitefly
- Fusarium cucumber wilt whose treatment does not bring proper results, it is necessary to prevent even at the planting stage. To avoid infection, you can:
- Yellow-brown spot on the foliage and pink bloom on the rest of the bushes are most often the result of anthracnose, which develops to a greater extent with excessive moisture. At the beginning, a barely noticeable mucus appears on the culture, but in the places of its concentration small ulcers are almost always formed, which lead to the death of the bush.
- It is this disease of cucumbers is considered the most common. Its signs are noticeable not only on the sheets (small spots of white color, gradually covering the entire surface), but also on the stems with petioles. The disease paints whips completely brown, they dry and fall off.
- From the beds you need to remove the remnants of last year's plants, because they may be insect larvae and viral bacteria.
Treatment and prophylaxis of cucumber peronosporosis is also carried out using chemical preparations.
For example, plant early varieties, which makes it possible to get a crop before the onset of cold weather, during which a peronosporosis develops. Since there is a risk that the seeds are already infected with this disease, they are recommended to be treated with a 0.1% solution of potassium permanganate before sowing.
These spots tend to grow very quickly, which ultimately leads to drying of the cucumber foliage. The disease affects both plants that grow in the greenhouse and those that are grown on open ground.Root rot is a dangerous disease caused by a fungus. Infected plants begin to rot in the area of the root collar. As a result of this whip die off. This disease of cucumber, like most infections, is easier to prevent than to cure. Most often, plants are affected as a result of excessive moisture in the soil and air, for example, in greenhouses, as well as during sudden temperature changes. Therefore, do not water cucumbers too often. In addition, if a cooling is expected in the spring, in the open field the plants are covered with a film.
I would not like to be sad, but I think powdery mildew on cucumbers will be loved. As said on the box specials - if the first spots appeared on the leaves - the plant is 70% affected.
The microscopic insect moves and lives no more than a day in the air, but it manages to postpone the gluttonous larvae on the leafy part of the cucumber. They suck the juice from the culture, which leads to the development of soot fungus.
What it is necessary to adopt methods of struggle with downy mildew
- The virus is transmitted with planting material and plant residues left in the ground, and rainy weather and humidity create favorable propagation conditions for the pathogenic bacteria.
- The causes of powdery mildew are almost the same as those that cause other diseases of cucumbers with a photo - temperature fluctuations, excessive humidity, excess weeds and neglect of plantations. Cold irrigation water, drafts and strong wind can also lead to its development.
- It is important to observe the turnover of crops and plantings (should be alternated with legumes), regularly weed cucumbers, timely remove unhealthy plants, carry out treatment from pests.
- Selection of a suitable site
- If we talk about seed treatment, then it is most often used drugs containing metalaxyl and mefenoxam. As soon as the first signs of the disease appear, fungicides are used. For the purpose of prophylaxis, strobilurin preparations are used: Strobe and Quadris. For the entire season, only two irrigations are carried out. Immediately after treatment with these preparations, the sporulation is destroyed and the spots on the affected leaves dry up.
- Since harmful pathogens may remain in the soil for several years, it is recommended to burn the plants themselves after harvesting rather than add to the humus.
Moreover, peronosporosis can spread to nearby located related cucumber plants, such as:If such a disease of cucumber, like root rot, still manifested itself, at its first signs a stem of two internodes from the root is added dropwise with earth. And, of course, care for such plants should be especially careful: weed, loosen, feed. Strong cucumbers will better resist the disease. This is one of the main preventive measures. In addition, you should not leave last year's garden leaves on the garden. It needs to be raked and burned.
Focus on PREVENTION !!
It is difficult to neutralize the whitefly because of its fertility. The methods of breeding insects themselves are not so complicated, it is enough to regularly wash the larvae from the bushes and loosen the soil and then add peat or humus to it. Spraying the drug Inta-Vir will help get rid of already gathered on the leaves of the colonies.
Maintaining the necessary humidity and temperature in greenhouses,
To prevent cucumber disease in the greenhouse and on the plots, it is necessary to sow only the tested seeds in a sufficiently heated and treated soil. Seed material is better to buy from friends, from official agrotechnical companies or to harvest independently. With anthracnose that has already proved itself, the treatment of cucumbers for diseases with folk remedies helps:If powdery mildew appeared on cucumbers, the control measures against it will consist in pruning the affected parts of the stem and disinfecting the soil. Recommended treatment:
Do not forget that the disease of cucumbers in the greenhouse and their treatment requires a thorough approach. In greenhouses, as in open gardens, frequency and fertilization rates are of great importance. It is not recommended to exceed the composition of the elements: urea (6-12g), superphosphate (approximately 10 g), potassium chloride (approximately 8 g) and ammonium nitrate (not more than 6-7 g) per 10 l of water.
Methods of dealing with powdery mildew on cucumbers
Preparation of seedlings and inoculum,
As soon as you notice peronospora on cucumbers, urgent treatment of the plant is necessary.
It will be a real breeding ground for downy mildew fungi. Another very important point - never plant cucumbers, pumpkins, zucchini every year in the same place. Choose a different site - this will certainly help to avoid recurring outbreaks. Now as for the soil in the greenhouse: after the end of the season and harvesting the plant, you need to remove the top layer of earth. And then this section of the greenhouse needs to be treated with a 0.1% solution of potassium permanganate.
Another disease of cucumber - powdery mildew - affects the leaves of plants.
Diseases of cucumbers photo, description and treatment in the greenhouse, in the open field
Good question I am also looking for an answer to it. Particularly interested in downy mildew. When young leaves of cucumber, green, beautiful, 5 -7 pcs. and here this disease attacks. How to protect them, how to effectively spray, water. Who from gardeners have this experience.
- Ants bred aphids on cucumber foliage
- Thorough disinfection of the earth and processing of the material with Trichodermine (5 g per 1 kg) will not interfere.
- A mixture of milk of lime and copper sulfate,
Ground gray to 30 g per each 10 sq.m. vegetable garden,
Signs of defeat cucumber powdery mildew
The first symptoms of powdery mildew are white or light gray patina, resembling flour. This is the mycelium and spores of the colonized colon. First, the plaque covers the entire surface of the sheet, then it thickens and turns black. As a result, the leaves dry out, wrinkling and curling. The ends of the shoots become crooked. With extensive damage, the bush dies completely.
Usually powdery mildew first infects the lower leaves on the ground. If you do not take action, the disease spreads to the top of the bush. The fungus has not yet reached the fruits, they can be harvested healthy. If cucumbers are already infected, they will not be stored - if they do not rot, they will crack.
The reasons for the spread
Spores of the fungus live in the soil up to 6 years. Therefore, powdery mildew of cucumbers often develops when crop rotation is not observed. At the same site can not plant pumpkin seeds for at least 6 years. But the mushroom in a small amount can live on other garden beds. If his argument is small, the disease develops only under conditions that favor it:
- Cold (below 20 degrees),
- Watering with cold water or heavy cold rain,
- Excessive humidity of air and soil,
- Non-compliance with the landing interval (bushes sit thickly)
- Excess nitrogen in the soil.
Powdery mildew in open ground is particularly susceptible if there is no protection against cold rain. People say that it is from the "acid" water. But in fact, low temperatures are harmful to plants. That is why the fungus often covers the bushes in August, when the sun is still hot and without it is very cold.
Ways to fight
Powdery mildew on cucumbers includes three types of measures:
- Treatment by folk methods
- Treatment with chemicals.
When choosing methods, not only your choice matters, but also the timing. While there is no disease, prevention is needed. If started, treatment. Folk methods will help with a small lesion, and chemical - with extensive. If the fruits are already ripening, the treatment of powdery mildew from cucumbers with chemicals is unacceptable. Therefore, once again have to turn to folk tricks.
Prevention start with the selection of the variety. Need powdery mildew resistant cucumbers:
- Aquarius (this is a variety, only hybrids are listed below),
- F1 farmer,
- Sultan F1,
- Emerald F1,
- Mazai F1,
- Moscow evenings F1,
- True friends F1.
Other preventive measures for powdery mildew include:
- Presowing seed treatment,
- Irrigation with warm water,
- Compliance with the principle of crop rotation,
- Careful use of nitrogen supplements,
- Exception of temperatures below 20 degrees
- After the last harvest - destruction of plant residues by burning.
Attention! Even if cucumbers grow in a greenhouse, powdery mildew can strike them from a low temperature at night, when it is only 1-2 degrees higher than outside. Therefore, the plants are covered additionally. In Japan, growing vegetables in tunnels located inside one large greenhouse is very popular.
Folk methods of struggle
The popular treatment of powdery mildew for cucumbers is effective at the initial stage of fungal reproduction. And this is the only acceptable method of struggle if fruits are already ripening on the bushes. Use any of the methods you like:
- Spraying a decoction of horsetail. 1 kg of fresh grass or 10 times less dry pour water on the wind and leave for a day. Then determine the fire and boil no more than 100-120 minutes. Then cool. You can store 7 days. For spraying, dilute the broth with warm water: 1 liter of broth per 5 liters of water,
- Spraying infusion of marigolds. Grind flowering bushes to get 5 liters of raw materials. Put them in a bucket and fill with warm water. Infusion is prepared 2 days. Before use, it is filtered and diluted in it 40 g of soap,
- Spraying a solution of mullein. For 1 part of manure take 3 parts of water. Insist for 3 days. Before use, 1 part of the infusion is diluted in 2-3 parts of water and filter the resulting solution.
Spraying for preventive purposes is better than treating powdery mildew on cucumbers. Therefore, herbal remedies can be used without symptoms after each cold rain and more often. Since the ingredients used in traditional methods do not adversely affect the plants, they can be used very often.
Use of drugs
Effective preparations for powdery mildew on cucumbers:
Attention! Before treating cucumbers for powdery mildew, read the instructions for the preparation selected for this purpose: they need to be diluted and sprayed according to it. And due to the fact that the fungus produces resistance to chemicals, change them regularly. Otherwise, cucumbers will receive a portion of chemistry, but the disease will not recede.
Signs of defeat cucumber powdery mildew
Powdery mildew on cucumbers with the following symptoms:
- On the lower surface of the sheet a gray bloom is formed with a violet hue,
- On the upper surface of the sheet, oily spots of an angular or round shape of a light green color with a yellow tint are formed,
- Over time, the spots grow larger and begin to cover the entire surface of the leaves,
- Each infected leaf becomes brown and fragile. As a result, the leaves crumble, exposing the stalks.
The difference between downy mildew and simple mildew is the color and nature of the spots formed. With a simple powdery leaves look as if sprinkled with flour. The spots are small, white. With downy powderiness, the leaves look as if they were burned by the sun from dew drops. But each of the diseases is equally dangerous for cucumbers - if left untreated, the bushes die.
While the cucumbers have not yet been hit with downy mealy, they are preventing the disease. This will keep the harvest whole and healthy. Traditional methods of struggle are suitable for the elimination of the first symptoms and extensive lesions, if the results have already started. The use of chemicals is permissible only before fruiting.
It is easier to prevent the development of downy mildew than to treat cucumbers and put up with the consequences of the disease. For this:
- Water only with warm water and only in the morning, so that before the night cooling the air humidity has decreased,
- Try to keep the temperature day and night flat, without sudden drops. The temperature is about 25 degrees during the day and 18-21 at night.
- Observe the principles of crop rotation,
- Ventilate the greenhouse often.
One of the measures to prevent mildew on cucumbers is the selection of varieties that are resistant to this fungus. But the most resistant to it are hybrids: Annie F1, Delpina F1 and Vicenta F1. If your choice still fell on high-quality plants, then the seeds must be soaked before sowing in a dark solution of potassium permanganate for disinfection.
Use of chemicals
It is possible to use chemicals and biochemical preparations at the stage of seed preparation for sowing. This is better than treating the powdery mildew on cucumbers, which always suffers losses in the harvest:
In the solution of the fungicide, cucumber seeds, for the prevention of downy mildew, must be kept for 100-120 minutes. After the procedure, the seeds are rinsed under running water and dried. Then you can sow them on seedlings or in open ground. The consumption of liquids - 1.5 liters per 1 kg of seed.
In the period of growth of the stem to combat downy mealy on cucumbers you need to spray the bushes with one of the following preparations:
- Vitaplan (consumption - 2-3 liters per ap, frequency - 2-3 weeks),
- Фитоспорин-М (расход – 10 литров на ар, периодичность – 1,5-2 недели),
- Протон Экстра (расход – 10 литров на сотку, периодичность – 1-1,5 недели),
- Профит Голд (расход – 5 литров на сотку, периодичность – 1-2 недели),
- Hamair (consumption - 10 liters per ap, frequency - 2 weeks).
After the use of chemical preparations for the treatment of cucumbers from false mealy, the condition of the plants may worsen. To keep them viable, first test the solution on several bushes. If they haven’t gotten worse in a day, feel free to spray it all over the plantation.
If your cucumbers do not breed annually due to the defeat of the vegetable garden with simple or downy mildew, do not neglect chemicals even during the period of ovaries and fruiting. You will not be able to harvest at least a week because it will be inedible. But this way you save the opportunity to enjoy the fruits of the rest of the season.
Diseases of cucumbers photos and their treatment: prevention
The most dangerous for plants is the treatment with the wrong means and the fertilizer with the wrong drugs, therefore it is important to determine the disease by external signs and to know preventive and curative methods.
Careful leaving during active growth.
- Now for this widely used combined fungicides: Copper Oxychloride, Efal, Ridomil Gold. These drugs are more suitable for spraying in the greenhouse. On the open ground, Acrobat MC has proven itself well.
- The most important rule is to avoid seed contamination. For this purpose, it is recommended to plant cucumbers in those places where the occurrence of peronosporoza is unlikely or even impossible. For the disinfection of seeds is very good heat treatment method. To do this, place the seeds in water with a temperature of +50 degrees for 15 minutes.
- At the first stage, a characteristic white bloom appears on their surface. Then the leaf blades begin to darken and eventually die. The disease is caused in the same way as in the first case, by a fungus of a special type. The development of this infection contributes to increased humidity and insufficient care for the plants.
- On a bucket of water a liter of cheese and 1h. l iodine, sprinkle copiously foliage of cucumbers, no diseases, harvest by October.
- These are pests that dig millions of underground tunnels and promote the emergence of aphids on leaves and stems.
- Most infections are transmitted by insects, so it is important to monitor their spread and take preventive measures in time.
Peronosporosis of cucumbers in a greenhouse: photos and methods of treatment
The first signs of cucumber peronosporosis in the greenhouse or in the open field are oil spots of green color, then they turn brown and the leaves dry out. With favorable conditions for the disease - low temperature, combined with high humidity and night fogs - the incubation period lasts 3-4 days. Spores overwhelming in plant debris are laid inside the affected tissue. The infection is carried by wind and on clothing.
In order not to resort to the treatment of cucumber peronospora, use film covers, especially for early varieties with a friendly return of the crop. In addition, a set of techniques for the protection of crops from the powdery powdery mildew includes:
- maintaining a high level of agro-technology using crop rotation and returning cucumbers to their former place no earlier than in 4-5 years,
- using a seedling method
- the use of trellis culture,
- compliance with the specifics of watering, fertilizing,
- preventive spraying,
- disinfection of seeds.
The garter of a cucumber to a trellis is now widely used - the stretched wire on supports. In this case, less drip-liquid moisture is formed on the underside of the leaf, which favors the development of the disease, since the plants are better blown out.
As shown in the photo, against the peronosporosis of cucumbers will help the combined cultivation of plants under shelters, followed by tying to the trellis:
You yourself have to experiment, what form of trellis to choose: whether to use the tent, or pull the wire in rows. The second method provides better airing, which prevents the development of the disease. However, the presence of drafts is in conflict with the biological requirements of the cucumber, which does not like the movement of air. And maybe the tent will be good - as a compromise?
Practice has shown that the trellis cultivation method is justified only in areas protected from the wind. It is recommended to gradually remove the lower leaves at a height of 25-30 cm from the soil surface.
Infection with downy mildew of cucumbers is facilitated by the presence of drip-liquid moisture on the underside of the sheet for at least 6 hours. To avoid this, it is better to water cucumber in the morning and not in the evening, then all the moisture will have time to evaporate.
Once every 10-15 days to increase the resistance of plants to disease and accelerate the growth of lateral shoots give foliar feeding. Sprayed in cloudy weather or early in the morning. 15 g of urea or 40 g of calcium nitrate, 3 g of boric acid, 3 g of copper sulphate, 5 g of potassium permanganate are used on 10 l of water. Urea contributes to the rejuvenation of the plant, calcium accelerates the appearance of side shoots, copper and manganese inhibit the development of downy powdery mildew, boron promotes better fruit set. When the first signs of downy mildew appear on cucumbers, you can use such a measure to combat the disease as spraying with a serum solution (3 liters of serum per 7 liters of water + 1 tsp. Of copper vitriol).
Practice has shown that the well-known Bordeaux liquid is effective for combating cucumber diseases in the greenhouse, such as peronosporosis and bacteriosis, when brown small ulcers appear on the leaves first, which then dry out and fall off, making the leaf resemble a sieve. But it must be fresh and properly cooked - 10 grams of copper sulphate and hydrated lime are taken for 10 liters. Separately dissolve the vitriol (preferably in hot water), separately - lime. A solution of copper sulphate is poured into the filtered lime solution, which by this time should be cold, mix well, and bring to a specified volume with water. Properly prepared liquid for the treatment of peronosporoza cucumbers in the greenhouse has a blue color, a neutral or slightly acid reaction. Green indicates an acidic reaction and can cause burns. Collecting cucumber after processing can be no earlier than 5 days.
In case of massive lesion with peronospora, it is necessary to immediately stop watering and top dressing for a week and spray the plants with a warm (25 ° C) solution of Bordeaux liquid.
Then planting should be treated with a weak solution of nitrogen fertilizers, better than urea, at the rate of 1-1.5 g per 1 l of water to stimulate the growth of lateral shoots. 2-3 treatments in 5 days will prolong the fruiting period.
After harvesting, the contaminated bed must be thoroughly cleaned of plant residues, and the remains must be burned and the soil treated with copper sulphate (3 tbsp per 10 liters of water). If possible, calcine the surface of the soil with a blowtorch or remove the top 5 cm layer of earth.
Some gardeners increased powdery mildew resistance using tablets metronidazole, which suppress pathogens of a number of diseases (2 tablets per 10 liters of water).
These photos show the treatment of cucumber peronospora:
Fight against other diseases and pests of cucumbers
The use of infusion ash can help in the fight against powdery mildew (white bloom), but cucumbers do not save from the powdery mildew.
Against the powdery mildew, a mullein infusion is used: 1 kg of mullein pour 3 liters of water. After 3-4 hours, filter and spray. If you insist for three days, then diluted with water 3 times. Potassium permanganate solution (5 g per 10 l) or soda ash (30–40 g per 10 l) can also be used against this disease. When any spraying need to add soap - 50 g per 10 liters.
Applying measures to combat the powdery mildew of cucumbers, it is advisable to use fermented weeds (not sick) instead of water when spraying. They are poured with water in the ratio 1: 2, after 5-7 days they are filtered and diluted with water 1: 8-1: 10. Against all fungal diseases, spraying with the following solution is effective: add 1 cup of milk, 10 drops of iodine, 10 tablespoons of 10 liters of water. l drinking soda and 50 g of household soap.
From askohitoza, olive spot effective feeding with 0.5% solution of potassium sulfate and a decrease in humidity. When white or gray rot appears, the affected parts of the stem are sprinkled with crushed coal or chalk, diseased fruits are removed, and the plants are sprayed with a solution consisting of 1 g of zinc sulfate, 2 g of copper sulphate and 10 g of urea per 10 l of water.
See a photo of how the fight against perinospora and other cucumber diseases in the greenhouse is conducted:
Against aphids and thrips, it is effective to spray a two-day infusion of wood ash (3 kg per 10 l of water), infusion of garlic (150 g of crushed cloves per 3 l of water + 10 drops of ammonia + 1 tbsp of baking soda and 40 g of soap).
In the fight against aphids effective and safe is fumigating plants with tobacco smoke. Use biologics to protect cucumber from diseases and pests.
Why does peronosporosis of cucumbers develop?
Peronosporosis can affect cucumbers and melons in the garden only under certain conditions. The thing is that the fungi that cause this disease can infect a plant only when they are in a wet and warm environment, therefore, in most regions, infection of plants, as a rule, does not provoke a serious decrease in yield.
Predisposing factors for the development of perinospora include:
- frequent rains
- high humidity
- greenhouse conditions
- cold watering,
- heavy dew,
- frequent fogs,
- rich condensate in greenhouses,
- poor ventilation of the greenhouse,
- a large number of weeds.
In dry weather, as a rule, the development of perinospora is not observed. When favorable conditions are created for the spread of a pathogenic fungus, almost all cucumbers in the area can be infected with them as soon as possible. Damage to the leaves by a fungus is often supplemented by a condition such as bacteriosis of cucumbers, for which pathogenic fungi create a favorable environment for reproduction. The affected plants begin to look sick, leaf after leaf is covered with brown and yellow spots, as well as white pollen, which is very similar to flour.
Due to the damage to leaf tissues by peronosporosis, the photosynthesis process is disturbed in plants, due to which the forming cucumbers do not receive the necessary substances. As a rule, cucumbers, which are tied and grow on a plant affected by peronosporosis, have a relatively small weight, an irregular shape, and in addition, significantly worse taste.
It is not uncommon for an ovary to appear on a plant completely affected by peronosporosis. The leaves, which are completely covered with traces of fungi, die off quickly and fall on the ground, where the spores of the pathogenic microorganism can persist for a long time.
At present, it is not known whether seeds taken from plants that were affected by peronosporosis can be a source of the disease. It should be noted that when identifying the leaves that were affected by the fungus, they must be plucked and burned, as only in this case it is possible to stop the increase in the number of infected plants.
Methods of struggle with peronosporosis cucumbers
If cases of the incidence of cucumber or melon crops by peronospora were recorded at a particular site, it is best to purchase seeds of the species that are not susceptible to this fungal disease next year.
Nowadays, cucumber species that cannot be affected by peronosporosis have already been developed. In addition, in order to prevent cucumber damage, it is very important to plant these plants every year in a new place, since the spores of this pathogenic fungus can persist in the soil for a long time.
If peronosporosis struck cucumbers that grew in the greenhouse, it is very important to conduct high-quality disinfection.
With the help of special disinfectants, all parts of the greenhouse should be treated, including racks, on which live fungal spores can remain. In addition, it is better to remove the top layer of soil and replace it. Heat treatment before planting can contribute to the elimination of spores of harmful fungi from the soil. As a heat treatment, the soil in the greenhouse or on the site where it is planned to plant cucumbers, is doused with boiling water.
Currently, there are not many tools that can eliminate peronosporosis and cure affected plants. The Bordeaux liquid gives a good effect, which is prepared by mixing 100 g of copper sulphate, sour lime, and 10 liters of water.
Cucumbers like liquid can be sprayed after the end of the active phase of flowering, the fruits can be eaten 1 week after the procedure. In addition, to the chemical means used to eliminate the harmful fungus, are drugs based on fungicide.
There are preventive procedures that prevent the development of peronosporoza cucumbers. A good effect is given by spraying plants that do not show signs of disease with whey. In addition, a good effect gives a mixture of iodine and kefir. As a rule, for the preparation of the mixture is taken 2 drops of iodine per 1 liter of kefir.
Among other things, the prophylactic is ash. Some gardeners have noted that dusting the stems of plants with ashes greatly reduces the risk of developing peronospora. In addition, an ash solution can be used, for the preparation of which approximately ½ cup of ash and 1 liter of boiling water are taken. Processing of this solution of plants is carried out at least 2 times, and the interval between the procedures should be 1 week.
In order to prevent the need to provide high-quality watering plants, and warm water. Full prevention and compliance with the technology of growing plants allows not only to prevent the appearance of peronosporoza, but also bacteriosis of cucumbers, which no less significantly reduces the yield.
Downy Mildew - Description
In plants infected with peronospora from the upper side of the leaves, yellowish-green oily spots of angular or rounded shape appear, limited by veins. Then, on the underside of the leaves, a barely noticeable gray-purple bloom forms. The spots gradually increase, coalesce, and as a result, the leaves wilt, shrivel and dry, crumbling into fragments that can infect neighboring plants. Due to the death of the leaves, the process of tying the fruits and their development slows down - the fruits become pale and tasteless. When severely affected, mildew false disease can kill a plant in a very short period of time.
Downy mildew affects all groups of cultivated plants - vegetables, garden and indoor flowers, fruit trees and shrubs. During one growing season, the pathogen forms up to 20 generations and disperses millions of zoospores. The spread of downy mildew is promoted by insect pests - whiteflies, aphids and others.
Treatment of peronosporoza.
The treatment of peronosporosis is carried out with a solution of sulfur - 50-80 g of the substance is dissolved in 10 l of water and the plant and the soil under them are treated with this composition. Powdery mildew treatment is also carried out with Fitosporin-M, Gamair, Planriz, Alirin-B or Glyocladin fungicides, treating them with a garden or vegetable garden with an interval of two weeks. One month before harvesting, the treatment with fungicides is desirable to stop and switch to folk remedies for downy powdery mildew.
However, the fight against peronosporosis is not only the treatment of plants with medicinal preparations. You can save your site from infection by observing the agrotechnical conditions of growing plants and carrying out preventive measures against diseases and pests.
Downy mildew - prevention.
Plant protection against peronosporoza begins with preventive measures. You can significantly reduce the risk of fungal diseases in your plants if you clean the area from plant residues and dig the soil to a depth of 25-30 cm in the fall. If you had to get rid of harmful microorganisms during the past growing season, treat the soil with a one percent solution in the spring potassium permanganate or a two-three percent solution of copper sulphate, then be sure to dig the soil. The soil can also be disinfected with Fitosporin-M, Gamair or Alirin-B.
For prophylactic treatment from peronosporosis of plants in early spring, before bud break, a seven percent urea solution, a ten percent ammonium nitrate solution or a fifteen percent ammonium sulfate solution is used. In the phase of the green cone, the trees are treated with a one-percent solution of Bordeaux mixture, then the spraying with this preparation is repeated after flowering and in the phase of ovary formation. Also, after flowering, biological products Integral, Gaupsin, Mikosan, Gamair, Fitosporin-M or Planriz are used for spraying plants - a preparation from peronospora, which can be used to process plants even a day before the fruits are removed.
To reduce the risk of plant diseases, it is very important to observe crop rotation at the site, returning cultures to their former places no earlier than in 3-5 years. Если же вы из года в год будете выращивать культуру на одном месте, это приведет к накапливанию в почве инфекции и, как к следствию, к ослаблению и болезням растений.
Обрабатывайте семена перед посевом – держите их в течение четверти часа в термосе с водой температурой 45-50 ºC или в однопроцентном растворе марганцовки. Roots of seedlings before planting in open or protected ground for 2-3 hours immersed in a solution of Trichodermine, prepared according to the manufacturer's instructions. Grow fungus-resistant varieties and hybrids. Do not compact landings, and crown trees and shrubs in time, thin out - the fungi are comfortable in crowded. Follow all agrotechnical requirements, carry out plant care activities on time. Strongly affected specimens immediately remove and burn.
Most often, the disease peronosporosis appears on cucumbers in August - just at this time the night temperature begins to fall, and condensate forms on the cucumbers, which is an ideal medium for the propagation of peronospora spores. Downy mildew on cucumbers can occur against the background of a lack of potassium, phosphorus or excess nitrogen in the soil. Peronosporosis of cucumbers is especially rapidly developing in the greenhouse, where there is a favorable environment for the formation of dew. What are the measures against peronosporosis on cucumbers? When the first signs of disease are detected, treat the plants in the greenhouse with a solution of fungicides Ridomil Gold, Efal, or copper oxychloride. In the open field it is better to apply a spraying of cucumbers with Strobe, Quadris or Acrobat MC preparations.
However, remember that if you are late for a couple of days, you may not have time to save the plants from death, so at the beginning of the growing season make a plan of preventive measures and follow it strictly. If you take preventive measures, your cucumbers will be protected not only from peronosporoza, but also from most fungal diseases. To protect cucumbers from downy mildew you need:
- - grow cucumbers that are resistant to downy mildew - for example, varieties Katyusha, Kumir, Photon, Zodiac, Rodnichok, Debut or Darling,
- - to conduct preplant heat treatment of seeds for 15 minutes in water at a temperature of 50 ºC,
- - to prepare the ground for planting - to treat the soil with Fitosporin-M or Gamair and then carry out a deep digging,
- - in the greenhouse it is necessary to regulate the humidity of the air. As soon as spots begin to appear, the affected leaves should be removed immediately, without leaving petioles,
- - increase the resistance of plants to pathogenic microorganisms by the introduction of potassium-phosphorus fertilizers. Do not overload the soil with nitrogen,
- - process cucumbers on a green leaf with a solution of a biological preparation Planriz, made on the basis of an extract from herbs.
This number does not pass with tomatoes, from personal experience - there is no 100% remedy for phytophtoras, I process 2 times "redomil-gold", I try to plant early superearly varieties and when I am tied up with 4-5 brushes of tomato I break off the gourds so that we can produce a crop before mass phytophthora invasions - it turns out by 90%
To fight them is simple: with the help of sweet baits (syrup) and dusting the ground with ashes or lime. Noticing the nests of ants, you can pour them with boiling water, dig up or pour plenty of kerosene (also used waste oil).
Cucumber pests - melon aphid
- Dark brown and olive spots are a sign of cladosporia
- Deep stripping of beds, scrupulous destruction of plant residues, systematic introduction of potassium fertilizers will also not be superfluous for prevention.
Most often, cucumbers are affected by diseases of the leaves, covering over time their shoots, tendrils, flower stalks and ovaries. When white rot plants are completely covered with mucus and bloom. The infection develops especially fast in greenhouses with thickened plantations, high humidity and stagnant air.
At the first signs of the disease, it is necessary to immediately exclude organic and nitrogenous onions feeding, continuing to apply only phosphorus-potassium fertilizers to the soil. It is also necessary to stop watering the area temporarily to reduce the level of humidity. How to deal with downy mildew on the bow? For this purpose, treatment of the bed with a one-percent solution of Bordeaux liquid, suspension of Arbamide or Polycarbacin is used. For the preparation of suspensions in 10 liters of water add 30-40 g of Polycarbacin or Arbamide. After a week or two, the treatment for peronosporosis is repeated. Spraying Bordeaux liquid should be stopped 3 weeks before harvest.
If you are processing onions with chemicals, you can not eat its greens.
Downy mildew on sunflower.
The sunflower struck by peronosporosis begins to lag behind in growth, its stems do not thicken, the root system remains undeveloped, chlorotic spots are formed on the upper side of leaves, and a whitish bloom on the lower side. Few of the affected plants reach the flowering phase and form reduced inflorescences with small, non-developing seeds. In total, there are six forms of destruction of this culture by downy mildew.
You can save the sunflower from peronosporoza by treating the plant with Pictor, Ridomil Gold, Abacus, Amistar Extra and others. In the case of sunflower for protection against peronosporoza, it is very important to observe the agrotechnology of the crop and crop rotation.
Downy mildew on grapes.
Downy mildew on grapes is called mildew. This is the most dangerous disease of European varieties of culture, imported to the south of France from North America in 1878. If not deal with this disease, it can cause serious damage to the vineyard. Peronosporosis, or mildew, infects the leaves, the tops of the shoots, inflorescences, tendrils, ridges and young grapes.
It is necessary to begin the treatment of grapes with mildew before the first symptoms of the disease appear, that is, it is necessary to carry out preventive treatment of the plant with Acrobat TOP, Cabrio TOP, Delan and Poliram. Treatments are carried out before flowering, and then with heavy and frequent dews, rains and high humidity once a week, and in dry weather once every two or three weeks. From two to eight sprays are carried out during the season.
Downy mildew on roses.
The defeat of rose bushes with downy powdery mildew, unlike powdery mildew, which first affects the leaves of plants that are in close proximity to the ground, starts from the top of the bush. This happens at a time when rosebuds are still the size of a pea, and the disease progresses rapidly: yesterday everything was fine, but today everything became awful - the leaves from the roses crumble, the flowering wave is broken. Peronosporosis appears on the rose with brown spots on the leaves, and if a yellow border forms around them, the leaves from the bush fall off instantly.
And yet it is not a deadly disease. If the roses grow in the greenhouse, first of all start to turn on the heating at night to reduce the humidity of the air. You cannot do this in the open field, but you can treat the bushes with Ordan, Thanos, Ridomil, Previkur, Acrobat, Consento or Revus.
Downy mildew on houseplants
Downy mildew and houseplants may suffer - yellow spots of irregular shape appear on the upper side of their leaves, with the development of the disease darkening and acquiring a necrotic nature. On the underside of the leaves a gray, gradually blackening bloom forms. Leaves turn yellow and die. Disease progresses in acidic and heavy substrates, poor ventilation and tightness on window sills or shelves exacerbate the situation.
Measures to combat peronospora on indoor plants are the same as on garden plants:
- - hydrothermal treatment of seeds before sowing (aging of the seed for 15 minutes in water at a temperature of 50 ºC),
- - removal of diseased leaves from the plant,
- - conducting five sessions of flower processing at weekly intervals with one percent Bordeaux liquid or fungicides Oxyh, Kuproksat, Ordan, Bravo or Quadris.
Powdery Mildew Remedies (preparations)
Means from downy mildew can be chemical and folk. Of the chemical preparations for perinosporosis, the most popular are:
- – Acrobat MC - dangerous for human health fungicide of system-local and contact action,
- – Alirin-B - biological drug suppression of fungal diseases on plants and in the soil, similar in its action to Fitosporin-M,
- – Bordeaux mixture - hazardous to human health, contact fungicide with a broad spectrum of activity,
- – Hamair - a biological bactericide that suppresses fungal and bacterial diseases in the soil and on plants,
- – Glyocladin - A biological fungicide that suppresses fungal pathogens. Analogue of Trikhodermin,
- – Oxy - systemic contact fungicide of a wide spectrum of action, dangerous to human health,
- – Polycarbacin - systemic fungicide of protective and therapeutic action for fruit and vegetable crops,
- – Bravo - protective and contact fungicide with a duration of 10-14 days,
- – Previkur - a systemic fungicide with a wide spectrum of activity against root rot and peronosporoza,
- – Ordan - fungicide of contact-systemic action, moderately dangerous to human health,
- – Ridomil Gold - contact-systemic fungicide, dangerous to human health,
- – Trichodermin - biological fungicide for the treatment and prevention of root diseases of ornamental and houseplants,
- – Fitosporin-M - microbiological fungicide of contact action to protect plants from fungal diseases,
- – Kvadris - fungicide of systemic therapeutic and prophylactic action, with a unique property to prolong the fruiting of crops for 2-3 weeks,
- – Revus TOP - a fungicide that protects and cures plants from fungal diseases.
Folk remedies to combat downy mildew
When the fruits on the trees, berries and vegetables begin to ripen, the treatment with chemicals that are toxic to humans should be stopped and the plants should be sprayed with folk remedies for the fight against peronospora.
What means, time-tested, you can use to destroy the powdery mildew?
You can pour one liter of skimmed milk into 9 liters of water, add 10 drops of 5% iodine to the solution and spray the plants with this composition.
Two glasses of wood ash to brew two or three liters of boiling water, then strain the liquid through a napkin folded 3-4 times and pour into a bucket of water.
Effective against peronosporoza on plants is a solution of 1-2 g of potassium permanganate (potassium permanganate) in 10 liters of water.
In the initial stage, you can influence the development of the disease by treating plants with onion peel extract: 200-300 g of onion peelings are poured with a bucket of water, brought to a boil, infused for two days, filtered and used for spraying.
Since manure develops a large amount of beneficial microflora destroying pathogenic microorganisms, it is possible to prepare a medicine for peronosporosis from it: one part of the mullein is poured with three parts of water, drawn for 3-4 days, carefully filtered, the amount of liquid is adjusted to 7-8 liters and carried out processing leaves in the evening or in cloudy weather.
Professional gardeners recommend to follow some rules of planting and cultivation to avoid problems and additional care afterwards. It is from these simple tips that one should begin to consider the diseases of cucumbers and the struggle with them will not seem terrible and endless.
Plants are prone to dangerous diseases at different stages of development. Cucumbers are no exception. Powdery mildew is a common cucumber disease. Prompt treatment and prevention will help preserve the harvest.
Grow those hybrids that are less susceptible to this disease (Katyusha, Debut, Rodnichok, Honey, Idol, Zodiac and Photon). These varieties are grown both in open field and in the greenhouse. The most popular variety of cucumbers grown on open soil is Phoenix 640.
Diseases of cucumbers photo leaf treatment for fusarium
Diseases of cucumbers in pictures you can see on this page. In addition to the above, there are other, no less unpleasant infections. In order to minimize the risk of infection, it is necessary to comply with agricultural practices: time to feed, weed, loosen the plants, as well as to prevent thickening. In this case, the cucumbers will remain healthy, and you will get just a great harvest both in the greenhouse and in the open field.
Do not pour tomatoes. Cut all the lower branches and ventilate the greenhouse. And this cup will pass you by)
- Insects are afraid of daylight, so they choose to feast on fresh greens and flesh at night. Dark litter and the characteristic shiny traces of slugs also do not contribute to improving the quality of the crop.
- When the aphids have already attacked the plantings, spraying them with fermented herbal infusion will help (1 kg is infused in 10 liters of liquid within 24 hours) or a suspension of ash (10 liters of water, 50 g of soap chips, 200 g of ash).
- This ailment is also called olive blotch, which can spread directly through the air, infecting areas with cucumbers during irrigation events or during rains.
In order for cucumber diseases, which photos are in the article, do not prevent rooting and growth, it is necessary to give preference to resistant varieties.
Mildew is a common disease. To detect the disease on the plant, you can look at the leaves - they are covered with white bloom. At first the leaves turn white, then they dry out and die. Mealy dew spreads quickly when the temperature drops and when watering with cold water. It is necessary to fight the disease at the first signs.
Since peronosporosis is a fungal disease, its reproduction occurs through the spread of spores, or more precisely, zoospores. Their unique flagella shape allows them to move in a liquid. And each watering of a plant promotes their favorable reproduction and infection of all new plants.
Cucumber is a very ancient vegetable. He appeared more than 6 thousand years ago. Initially, it was grown in the tropics and subtropics of China and India. This product is a real storehouse of vitamins. It contains vitamins of group B, C, potassium, phosphorus, iron, magnesium, and also contributes to the rapid absorption of animal fats. Therefore, meat dishes are very well combined with salads or cuts, which include this useful vegetable. But, sadly enough, every year cucumber growing becomes more and more difficult process.
To destroy pests will help regular digging sites and their pollination with ash or chalk. You can also try to lay out special shelters in which slugs will find refuge, and collect them during the day. It is also recommended to treat cucumber beds with Metaldehyde.
Spider mite breeds in hot weather
Downy mildew, as they call peronosporosis, is capable of rapidly spreading due to frequent fogs, large amounts of dew, too cool watering and temperature changes.
The disease is dangerous for the measles system, since part of the rhizome dies off, and the stem itself becomes rotten, and the plant dies just before the eyes. Root rot is caused by cold weather, heavy and too wet soil and poor quality seeds. Almost all diseases of the cucumber of infectious nature are dangerous because the pathogen can be on the beds, in greenhouses or not harvested plant residues for a long time.
To cope with the disease will help spraying a special solution. 10 liters of warm water, you must take 1 liter of liquid mullein and 1 tbsp. urea spoon. The solution must be well stirred and filtered. The leaves are sprayed from both the lower and the upper side.
It is very important to increase the plant resistance to possible diseases by fertilizing with mineral and organic substances.
The spores of this fungus can even be the seeds of a plant. And even worse, pests can successfully survive the winter on last year’s leaves that have fallen on the ground. Perinospora can affect a plant at all stages of its development, starting from the growth of the first leaflets and ending with the ripening period.
There are many diseases, and new ones appear that prevent its growth, productivity, and even lead to the death of the plant. Infectious diseases inhibit the growth of a plant, and it does not matter whether it grows in the open field, or in a greenhouse. Today we will discuss this disease as perinospora.
what preventive measures are needed so that next year there will be no late blight on tomatoes and downy mildew on cucumbers
Fungal and viral diseases in plants arise from the thickening of plantings, high humidity and poor aeration of the soil. Eliminate these problems and you will forget not only about the phytophthora and powdery mildew, but many other diseases. And of course, prevention is needed - seed preparation, post-planting treatment of seedlings, loosening. Go
Treatment of various diseases of cucumbers and pest control is not an easy process, but a serious approach to all measures and timely prevention will significantly simplify it and result in an excellent harvest.
Обустраивается на нижних сторонах листьев и, оплетая их тонкой паутиной, питается соком, чем может нанести существенный урон всем насаждениям. Жаркая погода идеальна для размножения клещей.
Болезни растений: мучнистая роса и пероноспороз
The development of plants and the emergence of the crop often interfere with not only insect pests, but also various diseases: powdery mildew, peronosporosis, kagatnaya rot, coccomytosis, anthracnose, rust and many other fungal diseases.
In this article we will talk about how to deal with powdery mildew and about the treatment of downy mildew (resuspension).
Mealy dew is one of the most common fungal diseases affecting pumpkin crops. It is usually found in greenhouses and hotbeds, but under favorable weather conditions (high air temperature and humidity) quickly spreads in open ground.
Perinosporosis affects cucumbers, melons, pumpkins, watermelons, as well as plants of the haze family. More often than other plants, parsley, parsnip, celery, dill, as well as cucumbers, zucchini, cabbage, peas, onions, and beets become infected with this disease.
How to deal with downy mildew and photo peronosporoza
Peronosporosis affects the leaves of plants. It develops both in closed and open ground and often leads to the death of plants.
Pay attention to the photo powdery mildew - at first it is oily spots on the leaves, which then turn into brown. On the underside of the visible visible purple spore mushroom spores. The pathogen can be stored in the soil and plant residues for 5-6 years. No disease resistant varieties.
High humidity and temperature of the air contribute to the spread of perinosporosis, therefore, an optimal microclimate should be maintained for the protection of greenhouse plants. Humidity should not be higher than 80%, and the temperature at night should not be lower than 20-22 ° C. Downy mildew can be stored in the soil and on plant residues; therefore, it is necessary to carry out autumn soil digging and burn plant residues.
To protect pumpkin crops from peronosporosis, they are sprayed with 0.4% copper oxychloride solution, 0.4% polycarbacin solution, or Bordeaux mixture. For its preparation mix 100 g of lime and 100 g of copper sulfate with 10 liters of water. Before planting in open ground, seedlings are recommended to feed ammonium nitrate.
When growing crops in greenhouses, it is important to avoid sudden changes in temperature.
High humidity is also harmful to plants under the film.
Photo gallery: powdery mildew and perinospora (click to enlarge):
Fight against cucumber diseases
The fight against cucumber diseases remains relevant for gardeners in those regions in which there is a predominant cultivation of this vegetable in greenhouse conditions. At the slightest violations of agrotechnology and rules of care, numerous diseases of cucumber arise. These can be root rot, powdery mildew, olive blotch, bacteriosis and much more.
Diseases of cucumbers and their treatment: cucumber ascochitis
Diseases of cucumbers and their treatment require thorough preliminary diagnosis. Ascochitis cucumber - is one of the most dangerous diseases of cucumber. It manifests itself in the form of drying of the stem with the appearance of dark perforations (longitudinal cracking), which is especially dangerous in the root part. Small points of pycnidial sporulation are visible on the affected areas. Conidiospores fly through the air, causing damage to healthy plants everywhere or healthy parts of the plant. The source of infection can be seeds, plant debris in the soil, as well as the affected parts of plants already planted. The disease is systemic, that is, the infectious principle develops inside the plant. The pathogen is stored on plant residues mainly in the form of pycnidia. Seed infection is also possible. In the latter case, the disease develops from the root of the cervix up the stalk, causing its individual parts and lashes to dry out. If the conditions for growing cucumber are generally unfavorable, the infection will go not only up, but also down the root, causing root rot, which leads to the rapid death of the plants. Harmfulness of askohitosis is expressed in the desiccation of leaves and stems, which leads to a reduction in the period of fruit formation and to a drop in yield.
The development of the disease is promoted by high air humidity against the background of a general weakened state of the plants, while the incubation period can be 4 days. With the intensive development of ascohitosis, a gray mycelial coating appears on the tips of the fruit, which is mistakenly taken as gray rot. In fact, plants weakened by ascochytosis, and in particular fruits, are affected by a secondary infection in the form of sporification of saprotrophic fungi from the genus Penicillium or from the genus Botrytis.
Often on the cucumber plants affected by ascohitoz, the appearance of turbid exudate droplets caused by the secondary lesion of cucumber by bacteria from the genus Ervinia is noticeable.
To combat the pathogen, as a rule, special pastes containing contact preparations (Rovral and Strobilurins) are used. Paste is applied to the affected area with the capture of the healthy part of the plant, and thus affect not only the pathogenic onset, but also prevent the formation of spores (sporulation), which will prevent the spread of spores in the greenhouse.
Protection of cucumbers from disease: downy mildew of cucumbers
Protection of cucumbers against diseases also requires close attention. Among them is found down powdery mildew of cucumbers (peronosporosis). This is one of the most dangerous diseases of cucumber. It manifests itself first in the conditions of open ground, especially in years with wet unstable weather, in particular, with sharply changing daily temperature variations for 5 days (in the daytime 25 ° C and higher, and at night 12 ° C), and then it is detected in the structures of the protected ground. The removal of the plastic film from the shelter at this time, the precipitation of cold rain and watering with cold water - all this leads to the defeat of plants in greenhouses and shelters, as well as a subsequent increase in the disease.
On the leaves, symptoms of the disease appear from above in the form of yellowish angular-round spots, and on the lower side - in the form of a whitish-grayish bloom from the organs of fungus spider. Ripe spores are picked up by air currents, spread throughout the entire volume of the beds, shelters or greenhouses, and cause infection of new leaves and new plants. Soon the leaves shrink, turn brown, dry out and fall off. With increased humidity, especially in greenhouses, the disease also manifests itself in the form of leaf rot.
Harmfulness of the disease is expressed in the premature dying off of the leaves, because of which the period of fruit formation sharply shortens, which naturally leads to a decrease in plant productivity and a drop in yield. At the first signs of illness, watering and feeding are stopped (they should not be given at all for 7 days), and the plants should be sprinkled with oxyhom (2 tablets or 20 g per 10 l of water).
You can actively restrain the development of the disease by spraying with a biological drug - pseudobacterin (rhizoplan) - in seedlings and at the beginning of fruiting (2 tablespoons per 10 liters of water) in the afternoon. The infection persists on plant debris up to 7 years old, therefore it is necessary to carefully remove plant debris, and also to destroy every part of them. It is also desirable to return the greenhouses and shelters for cucumbers to the previous place of cultivation not earlier than in 7 years.
Anthracnose cucumber. The disease manifests itself in all above-ground organs of cucumber plants at any age, both in open ground and in greenhouses. Leaves form rounded, vague yellowish-brown spots, which after drying dry out. In wet conditions, pinkish pads can be formed from the sporulation organs of the fungus (conidia) on the spots. On the stems and petioles stains in the form of ulcerations, depressed and oblong - in these places the stem is often cracked, causing the plant to die. The spots on the fruit are depressed, at first they are small, but as they increase they turn into ulcers, settling on a cucumber in concentric circles. The harmfulness of anthracnose is manifested in a decrease in the area of assimilation and loss of plants, which leads to a drop in yield and a deterioration in product quality.
High humidity (90% and above) and high temperature (up to 27 ° C) contribute to the development of anthracnose. In this case, the symptoms of the disease begin to appear after 4 days. When the air humidity decreases, the development of the disease is inhibited, and when the air humidity is 55% and below, no infection occurs at all.
Direct sunlight also dramatically slows down the development of the infection, which is why the infection most often manifests itself in thickened landings and shaded areas.
The causative agent of infection remains on the remains of plants, therefore, greenhouses and beds should be carefully removed from them and then burned.
Also, the onset of infection is detected in seeds harvested from diseased plants. Therefore, the seeds should be taken either only from healthy plants, or purchase them in specialized stores.
The protective measures here are basically the same as those against powdery mildew, peronosporoza and ascochytosis.
Cucumber bacteriosis (angular spotting). The causative agents of infection (bacteria from the genus Pseudomonas) infect all aboveground organs throughout the growing season. The disease is especially pronounced in film greenhouses or under film covers. Angular spots appear on the leaves, bounded by veins. At first they seem to be oily, and then they become light brown. On the underside of the sheet, droplets of turbid liquid appear in places of spots (turbidity is due to the accumulation of bacteria). When it rains or improperly irrigated, splashed bacteria spread through other leaves and plants, which can lead to a massive destruction of plantings. During the growing season, bacteria are also spread with the help of wind and insects. The pathogen enters the plant through natural passages (for example, through the stomata) or through small wounds inflicted, including by insects.
In dry conditions, the droplets with bacteria dry up, and the spots become, as it were, covered with a whitish crust (dead tissue may fall out under it). On the petioles of the leaves and on the stems brown longitudinal spots are formed, which leads to the suspension of growth, the falling off of the leaves and the broken stalks. Shallow watery, colorless spots appear on the fruits, which soon turn into rounded ulcers. In them, in humid conditions, turbid droplets are also noticeable. The affected area does not grow, the fetus becomes ugly.
Harmfulness is expressed in the loss of seedlings (they rot), in a sharp decrease in the area of the photosynthetic surface and, as a result, in the deterioration of the processes of assimilation, in the lag of growth, as well as in a decrease in yield and deterioration in the quality of fruits. The causative agent of infection persists in plant residues on the soil surface. If the remains are buried or plowed, then they rot faster, causing the death of bacteria.
Cucumber Olive Spot
Brown or olive spot of cucumber. This disease affects the fruits of different ages, especially in film greenhouses. On them appear rounded, in-depth spots (ulcers), initially yellowish, then black, the fruits become bent, lose their presentation.
The disease develops strongly with a periodic drop in temperature in the greenhouse to 17 ° C and at high humidity (92–97%). For example, in the open field, signs of the disease usually appear by the end of the growing season with a strong cooling and the appearance of abundant dew.
The infection is stored on plant debris, in the soil, on the inner floors of greenhouses, on the inventory.
Restrains the disease, and with careful implementation prevents the appearance of the disease. The following set of activities: the alternation of cultures (crop rotation). Destruction of plant residues, annual greenhouse disinfection (with checkers or sulfur - 100 g / m3), removal of fruits with the first signs of illness, maintaining the temperature in the greenhouse since the transplantation of the seedlings at a level not lower than 18 ° C, drafts should not be allowed when ventilating.
Cucumber Root Rot: Treatment
Root rot of cucumber. Adult fruit-bearing plants in greenhouse conditions are the most affected by this disease. Cucumber leaves, starting from the lower tier, fade, turn yellow and hang. The basal part of the stem and the roots turn brown and shredded, while the young fibrous roots are not formed. Plants dry out and die completely.
The root rot of cucumber can be found on the seedlings in the form of browning and thinning of the stems and roots, while the cotyledons and young leaves wither, which also leads to the death of the plants.
Pathogens, mainly fungi of the genus Fusarium, settle only on plants weakened for some reason. As a result of sharp fluctuations in day and night temperatures, when watering with cold water, when making excessive doses of nitrogen fertilizers, at high temperatures (35 ° C) and high soil moisture, with a sharp decrease in soil temperature less than 17 ° C, etc.
The infection can be carried to greenhouses with soil mixtures during soil replacement or when entering the greenhouse in dirty clothes and shoes. Later it is stored and accumulates in the soil.
Of the protective measures that limit the infectious potential in the greenhouse, it is necessary to carry out either soil disinfection (which is very troublesome and expensive), or replace the soil (which, although difficult, is quite affordable). For the treatment of root rot of cucumber and increase the fungistasis of the soil in order to prevent root rot, it is necessary to make a biological product "Trichodermin" (produced on the basis of the fungus Trichoderma, which is a tough antagonist for the fungus Fusarium). Also it is necessary to strictly observe the necessary modes of cultivation of plants.
Photo gallery: cucumber diseases (click to enlarge):
How to deal with downy mildew (peronosporosis)?
The main symptom of downy mildew on cucumbers (see photo) is the yellow-green specks that cover most of the leaf. They are still taken for traces of acid rain. A purple-gray bloom appears from the bottom of the sheet, as a result of which it dries out completely and crumbles. Downy mildew of cucumbers affects plants regardless of age. It is characteristic in most cases when growing cucumbers in open ground.
Prerequisites for the emergence and development of perinospora is high humidity and air temperature up to 16-180С. The disease develops with small droplets on a leaf.
Disputes are able to maintain their dangerous activity in the soil for a long time, so it is very difficult to fight them. If perinospora or downy mildew on cucumbers is manifested, control measures should include the use of certain drugs containing copper (Bordeaux liquid, Ridomil Gold, Oksihom). These agents are effective as a prophylactic agent.
If cucumbers are affected with downy mildew, the treatment is carried out with the “Rizoplan” preparation. It is based on living cells of some bacteria. They are absolutely harmless to humans, but disastrous for the disputes of downy powdery mildew. The drug also does not accumulate in the soil, but immediately decomposes.
In addition to traditional drugs, you can apply mildew for cucumbers and folk remedy - whey. She sprayed the leaves.
How does olive blotch (cuodosporiosis) appear on cucumbers?
The emergence of olive cucumber spotting (see photo) should be observed in the second half of summer, when cucumbers have already fully formed a bush. Manifests an olive spot on fruits in the form of spots of olive (brown) color with bloom. The disease spreads quickly and if you do not carry out treatment, you can lose the entire crop.
This type of disease is more characteristic of greenhouse conditions. Spores of cladosporia are resistant to the microclimate of the greenhouse, so you should immediately begin the fight against this disease.
If olive cucumber spotting is observed, control measures should include thorough wiping all surfaces of the greenhouse with a disinfectant that does not contain chlorine. In no case do not water cucumbers with cold water, and at the first detection of the disease in general, you should stop watering the plant for 3-4 days.
Treatment of cucumber disease in the open field is carried out through the use of solutions that contain copper - Bordeaux mixture with the addition of liquid soap.
In order to prevent the occurrence of olive blotch, a crop should be replaced in the affected areas.
What is a common field cucumber mosaic?
Ordinary cucumber mosaic (see photo) most often develops in open soil. Symptoms of the disease are yellow-green spots in the form of a mosaic. With the development of the disease, the leaves of cucumbers curl, grow dull, dry out and fall off. Fruits become heavily pimply. Under the influence of the disease, the plant's immunity is so weakened that with a sharp decrease in air temperature, the bush simply stops growing and soon dies off.
The danger of this disease lies in its resistance to cold. Spores of an ordinary field mosaic can easily survive the winter and cold in the root systems of reserve plants (sow thistle, quinoa, wood louse, bindweed, wheat grass). Это трудновыводимые сорняки, поэтому бороться с данным вирусом очень сложно. Можно применить способ выращивания огурцов в пластиковых бутылках. Он абсолютно не сложный и растения при этом не поражаются полевой мозаикой в 94% случаев.
Чем обрызгивать огурцы от болезни? При обыкновенной мозаике огурца лечение заключается в опрыскивании кустов молочной сывороткой. In severe cases, this is done with a concentrated substance, and in prophylactic measures and in the initial stages of the disease, serum should be diluted with water in proportions of 1: 2. Treatment of cucumbers from diseases of folk remedies very often gives a positive and lasting result.
Green and white speckled mosaic
Green and white mosaic cucumber (speckled) - one of the most common infections. Symptoms of the disease are shriveled leaves with blown-up places, there are also areas with green or white color. White spots are in a progressive stage. In this case, to deal with the disease is very difficult.
When the stage is neglected, cucumber bushes dull their growth. The leaves weaken and begin to wilt in places. Fruits, accordingly, become very soft, and their tastes deteriorate. An outbreak of the disease can trigger a sharp increase in temperature from 220 ° C to 300 ° C.
This dangerous viral disease is transmitted through untreated tools, plant residues, and it is simply stored in the soil. To fight this disease, gardeners choose varieties that are resistant to the disease (mainly hybrids for open or closed ground).
The best measure for getting rid of this cucumber disease is care. It is necessary to remove the affected shoots and leaves in time and burn them immediately. Also, for the prevention can be sprayed bushes with a light solution of whey.
How to deal with gray cucumber rot?
Gray rot on cucumbers (see photo) is a type of viral disease that manifests itself during the period of their active fruiting. Leaves, stems, and fruits may appear gray in color, especially in the internodes. The most favorable environment for its development is a densely planted area of a vegetable garden or a bed.
The fact is that cucumbers that grow in close proximity to each other, begin to rot because of the inability to grow in cramped.
How to deal with gray mold on cucumbers? The medical event is the timely removal of diseased leaves and entire sections of the stem. In some cases, it is necessary to remove the entire bush. The fight against gray mold on cucumbers also consists in applying a specially prepared substance (chalk with manganese) to the wounds of the removed leaves. The consistency of such a remedy should be viscous and have a light pink tone.
Cucumber Root Rot
The danger of root rot of cucumbers (see photo) is that the signs of the disease are not immediately visible, because it affects the root system of the plant. The first sign of this disease is a sharp wilting of the bushes. In this case, you can not begin to water the plant, it will hurt him even more.
How to save cucumbers from root rot? In the early stages of the manifestation of the disease, the root system should be slightly exposed (to do this, slightly loosen the soil around it). Treatment of root rot of cucumbers consists in sprinkling the affected parts with a specially prepared composition (charcoal, chalk and ash). A solution of copper sulphate and copper oxychloride may also help from the root rot of cucumbers.
After therapeutic measures, the roots and part of the stem should be sprinkled with clean, dry and not affected soil. Watering can begin at the first sign of improved plant growth.
Pests and diseases cause great harm to cucumbers, especially when growing them indoors. This is mainly due to the specific features of their cultivation in small amateur greenhouses. This lack of elementary crop rotation, a limited set of cultivated crops, the lack of necessary drugs and elementary skills to combat major pests and diseases.
Mealy dew is a widespread harmful disease of cucumbers in greenhouses. It causes especially great damage in high humidity, especially with frequent dew and sharp temperature fluctuations, poor ventilation, watering with cold water, etc. The disease causes a strong decrease in yield and a significant reduction in the vegetation period.
Disease often affects fruiting plants. First, on the upper side of older leaves, and then on the bottom, rounded spots are formed, covered with a white powdery coating. Then they increase in size, appear on the underside of the leaves, covering the entire leaf. Diseased leaves become light, fragile, turn up and dry quickly. With a strong defeat, a patina may also appear on the petioles and stems. At the same time, individual lashes may even dry out.
Mealy dew develops especially quickly if there is drip moisture in the greenhouse. That is why often the first foci of the disease appear near the vents, broken glasses, where droplets of moisture fall on the surface of the leaves. In greenhouses, the disease progresses rapidly at a temperature of 20-25 ° C and a relative humidity of more than 80%.
Defeating powdery mildew is difficult, but possible, if you use the entire set of preventive and eradication agents.
First of all, it is the observance of garden crop rotation when growing cucumbers in open ground, and in greenhouses with two greenhouses - alternately growing cucumbers and tomatoes in them. It is very important to grow varieties and hybrids of cucumbers, relatively resistant to powdery mildew. By the way, the set of such varieties in the trade is pretty solid. But let's be honest and let's try to remember - did this interest us when choosing a variety?
No less important is the cleaning of greenhouses and greenhouses in the autumn from plant residues and weeds and their immediate destruction, followed by disinfecting the entire greenhouse with bleach or fumigating them with sulfur briquettes. Of great importance is also a deep autumn digging of the soil ...
When the first signs of powdery plaque appear on the leaves, they must be sprinkled with a solution of mullein: 1 liter of liquid mullein and 1 tbsp of 10 liters of warm water (25 ° C) are taken from the water. urea spoon. The solution should be well stirred, drain and spray the leaves in the morning in warm weather. Leaves should be processed from the sprayer from both the bottom and the top side. Helps pollinate plants finely ground gray. To do this, pour sulfur into a bag of three-layer gauze and pollinate the plants during the day in sunny weather at an air temperature of 23 - 28 ° C. When processing in a greenhouse, it is necessary to close the vents and doors, and cucumbers in the garden in the open ground cover with a film for 2 hours. A good result is obtained when spraying the plants with a solution of potassium permanganate (1.5 g per 10 liters of water). An effective way against powdery mildew is spraying of plants with colloidal sulfur, 40 g. Of the preparation per 10 liters of water. In this case, the treatment is carried out in cloudy weather.
A more reliable way to combat powdery mildew on cucumbers is spraying with Topaz. To do this, take 1 ampoule (2 ml), diluted in 10 liters of water (room temperature), stirred and poured into the sprayer with a fine spray.
Spraying is carried out both at the first signs of the disease, and for prevention. Sprayed cucumbers 2 times. The first spraying is carried out at the appearance of 8-10 true leaves, the second - at the beginning of flowering (approximately 10-12 days after the first).
Signs of the disease: white scurf appears on the leaves, which quickly spreads, as a result, the leaves turn white (as if sprinkled with flour), then they dry out and the plants die. And the causes of the disease are that when the temperature changes sharply (day 25, and 12-15 at night), when watering with cold water or during cold rain, the causative agent of the disease develops. Control measures: spray your plants with drugs such as TOPAZ or FOUNDAZOL. Good luck!
Diseases of cucumber leaf photo treatment for fusarium
Peronosporosis of cucumbers whose treatment is recommended by experts using a milky iodide solution (10 drops per 10 liters) or urea (1 g per 1 liter) will not interfere with the production of beautiful ripe fruits. The main thing is not to forget about the disinfection of seeds, warming up the soil and mandatory dressings.
If you have noticed that the root rot of cucumbers has begun, the treatment is carried out with the help of mulch bushes with clean sand, peat mixture, chalk (limestone) or sawdust. Already contaminated - should be ruthlessly cut and disinfect the soil with dry bleach in the amount of up to 200 g per square meter. It is desirable to use warm irrigation water.
Seeds are sown exclusively in heated soil. At a depth of 10 cm, the temperature should be at least 12 degrees Celsius.
To defeat powdery mildew, you can use useful herbs. It is necessary to place chopped nettle, willow-herb, coltsfoot, plantain, wood lice, celandine, dandelion in a large container. All herbs must be thoroughly mixed. Pour half of the resulting mixture with a small amount of hot water, carefully rub and mix, add water so that you get 10 liters. After 2 days, the infusion is filtered and added to it 1 tbsp. spoon of urea and 1 tbsp. spoon of liquid soap. The mixture should be sprayed cucumber leaves, repeating the procedure after 6 days.
A rather effective way to fight is treating seeds before planting with biological substances. Trichomerdin preparation in this case is ideal. The main thing is not to overdo it with the dosage, which can lead to deformation of the seeds and in the future - to the inhibition of plant growth. Trichomerdin paste from 40% of the main drug is also well used. Its application is made in places cut the affected leaves and stems of the plant.
But most often the peronosporosis of cucumber can appear in the period of August, because at that time the night temperature goes down. The plant produces condensate, and this is the ideal moist environment for the propagation of spores of this disease. Especially quickly this occurs in the greenhouse, where even more favorable environment for the loss of dew. In addition, unbalanced soil can serve as the appearance of peronosporoza. For example, there is a lack of phosphorus, potassium, or an excess of nitrogen in the earth.
Peronosporaz cucumbers or downy mildew - one of the most common diseases of this vegetable. This is exactly the disease that can lead to the death of the plant, as well as significantly reduce its yield. For the first time in Ukraine, this disease appeared on the garden plots of Kharkiv in 1972. Until today, breeders have not managed to find a cure for this disease.