White rot on cucumbers in a greenhouse: treatment with folk remedies, photos, what to do

Symptoms of occurrence

White rot, or sclerotinia, is a fungal disease of cucumbers that develops in conditions of high humidity. You can recognize the disease by several symptoms:

numerous white spots with a “fluffy” surface on leaves and stems;
softening and wateriness of plates and shoots;
the presence of mucous growths that secrete a translucent liquid;
flaky white plaque on the foci of infection.

Over time, the spots left by rot become covered with small black dots, or sclerotia - fungal spores. The tops of cucumber bushes wither and die.

Reasons for development

White rot gets on cucumbers mainly through contaminated tools, along with wind and water for irrigation, as well as when poor-quality soil is added to the beds. The disease spreads quickly throughout the plantings. Cucumbers with mechanical damage to the stems and leaves are especially vulnerable to it.

White rot feels best in high humidity. The disease affects greenhouse cucumbers and bushes growing in open ground during rainy summers. The development of the disease is facilitated by low air temperatures in the range of 20-22 ° C and poor ventilation of plantings. White rot is caused by too much watering with cold and hard water, as well as infrequent or complete lack of pruning.

White rot on cucumbers most often develops in greenhouses

How to fight infection

The principles of combating harmful microflora are simple. The following measures should be applied:

observe the principles of crop rotation;
collect and destroy remnants of vegetation;
loosen the soil, allowing access to oxygen;
disinfect greenhouse frames and interiors of greenhouses by spraying them with a 4% bleach solution;
To grow cucumbers, you should use a mixture of fresh turf and humus, adding well-decomposed peat.

If you apply these tips and promptly carry out preventive work in the greenhouse, you can completely defeat these dangerous diseases that affect cucumbers and significantly increase yields.

Source: sadteplica.ru

Why is white rot dangerous?

Fungal disease poses a real danger to cucumbers. White rot spores are very tenacious and can remain in the ground for a long time, waiting for favorable conditions. The disease in the active phase affects all parts of the plant from roots to fruits, harming both adult bushes and seedlings.

If left untreated, white rot quickly leads to wilting of cucumber plantings. The bushes turn yellow, their leaves become watery and die, and over time the entire plant dies.

Attention! White rot on ripening fruits makes cucumbers completely unfit for consumption.

How to treat cucumbers in a greenhouse against white rot

There are several ways to treat white rot on cucumbers in a greenhouse. If the plantings are severely damaged, aggressive chemical solutions are used; at the first symptoms, folk remedies may be sufficient.

Chemicals

Chemical preparations for white rot quickly eliminate the fungus even when cucumbers are seriously infected. Several products are especially popular:

Abiga Peak. The fungicide is supplied in the form of a liquid suspension; to prepare a working solution, you need to mix 50 ml of the drug in 10 liters of water. Spraying is carried out in early spring or from the moment the first symptoms of white rot appear. In total, up to four treatments are performed over the summer with breaks of two weeks.

The last time Abiga Peak is used for cucumbers is three weeks before harvest.
Topaz. To spray greenhouse cucumbers, prepare a solution at the rate of 2.5 ml of the drug per 10 liters of liquid. In open ground, a more concentrated product is used - a similar volume of fungicide is diluted in 8 liters of water. Spraying is carried out at the first symptoms of white rot. If signs of the disease persist, repeat the treatment after 3-7 days.

Topaz not only helps with white rot, but also protects cucumbers from powdery mildew
Acrobat MC. The universal fungicide is diluted in an amount of 20 g per bucket of water, the product is mixed and the crops are sprayed up to five times per season. The protective effect of the drug lasts up to 14 days, so the treatment is repeated from time to time.

The composition of the drug Acrobat MC includes the active ingredients mangozeb and dimethomorph

Spraying cucumbers against white rot is carried out only in the morning or evening hours, so that the bright sun does not leave burns on the leaves. First, the preparations are sprayed at the base of the bushes, and then gradually rise up. It is necessary to treat not only the surface of the leaf plates, but their reverse side, where the bulk of fungal spores accumulate.

Biological control methods

Unlike chemicals, biological drugs have a milder effect. They are allowed to be used, including during the period of harvest ripening; the working components do not accumulate in the tissues of cucumbers. Among the reliable and proven means are several:

Fitosporin. The biological product is recommended for use both for the prevention of white rot and for its treatment. In the first case, you need to dilute 20 g of the product in a bucket of water for open ground and 7 g in 10 liters of liquid for greenhouse cucumbers. If the bushes have already suffered from fungus, the dosage of the drug is increased to 30 g.

Spraying cucumbers against white rot with Fitosporin is carried out once every ten days.
Read also: Characteristics of Atlantis f1 cucumbers and growing a hybrid
Gamair. For white rot, you need to dissolve 10 tablets of the product in 20 liters of water and treat the plantings at the rate of 1 liter per 10 m2. Spraying is carried out twice a season.

It is necessary to use the biological product Gamair for cucumbers before flowering and after it at the beginning of the formation of ovaries
Screening To eliminate white rot on cucumbers, you need to dilute a couple of caps of the liquid preparation in 1 liter of water and spray generously over the leaves and stems of the bushes. After three weeks, re-treatment is carried out.

It is allowed to use the Barrier for cucumbers against white rot up to 3-4 times per summer

The first effect from the use of biological preparations becomes noticeable 1-2 days after spraying. The products cope well with white rot in the early stages; they can be used, including at the stage of fruit ripening.

Attention! Biological preparations do not harm soil microorganisms, but only increase the nutritional value of the soil.

Folk remedies

You can spray or water cucumbers against white rot with homemade preparations. In case of severe infection, it is not recommended to use folk remedies, as they may give too little effect. But with the initial symptoms of the disease, solutions bring real benefits and help restore the health of cucumbers:

Milk-iodine infusion. To treat white rot on cucumbers in a greenhouse with whey, you need to dilute 1 liter of milk in a bucket of water. Add 10 ml of pharmaceutical iodine to the components, and then stir thoroughly.

Spraying with milk-iodine whey for cucumbers is carried out once a week.
Soap and wood ash. In 10 liters of liquid you need to dissolve about 300 g of crushed laundry soap and add a glass of ash powder. The resulting preparation is sprayed on cucumbers when the first symptoms of white rot appear.

Cucumbers can be sprayed with ash and soap weekly - the product does not harm the plantings
Soda and potassium permanganate. The following solution has a good effect on white rot - stir eight large spoons of soda powder in a bucket of water and add an equal amount of potassium permanganate. The resulting product is sprayed on bushes in windless and sunny weather.

To increase the viscosity of the soda-manganese solution, you can add 15 g of soap shavings to it

It is best to use folk remedies for white rot of cucumbers for preventive purposes. Treatments can begin in early spring, especially if conditions on the site and weather are favorable for the development of the disease.

Attention! After spraying cucumbers in the greenhouse, the greenhouse must be thoroughly ventilated to prevent a sharp increase in humidity.

Cucumbers resistant to white rot

Some varieties of cucumbers demonstrate increased resistance to white rot:

Zozulya. The hybrid variety bears cylindrical fruits with a slight bend and sparse large tubercles. Cucumbers are juicy, sweetish, up to 24 cm in length and up to 300 g in weight.

When planting Zozulya cucumbers, you can harvest up to 20 kg of crop per 1 m2
Claudia. The hardy variety bears short fruits up to 12 cm in length with an average weight of 80 g. Well suited for salads and pickling; the peel of cucumbers is delicate and thin.

Claudius cucumbers produce up to 25 kg of fruit per 1 m2 in greenhouse conditions
Connie. The productive variety is capable of producing up to 16 kg of fruit per 1 m2, and ripens on average, approximately 50 days after germination. Cucumbers are short, up to 70 g in weight, juicy and without bitterness.

Connie cucumbers are often used for pickling

When growing varieties resistant to white rot, it is still necessary to carefully follow all the rules of agricultural technology. Bushes are less likely to suffer from fungi, but in the absence of ventilation and in conditions of high humidity they can still get sick.

Preventive actions

White rot of cucumbers is not always treatable, so it is easier to prevent the development of the disease. When breeding a crop it is necessary:

control the volume of watering and ensure that the soil under the cucumbers does not become waterlogged;
use only settled and slightly lukewarm water;
regularly thin out the plantings and ventilate the greenhouse;
before transferring seedlings to the ground, disinfect the soil with fungicidal agents;
soak cucumber seeds in antiseptic solutions.

When the first signs of white rot appear, severely damaged plants must be urgently removed from the beds. Spraying is carried out for healthy and slightly affected bushes.

You cannot plant cucumbers in a greenhouse or garden after celery and parsley. These crops also suffer from white rot, and the soil after them may be contaminated.

Useful tips for gardeners

Gardening specialists offer the following useful tips to prevent rotting in cucumbers:

Purchase high-quality seed material for planting.
To maintain crop rotation, use several greenhouses to alternate plantings of different crops. You can also purchase a portable greenhouse.
Carry out preventive spraying against fungal diseases.
Ventilate the greenhouse.
Avoid planting areas where groundwater is close to ground level.
Fertilize regularly using organic fertilizers to create good microflora. Adding wood ash to the soil helps especially against the appearance of fungus.

If rot is detected on cucumbers, the diseased parts must be removed and treated, sprayed, and the cause of their occurrence must be determined and eliminated. A set of preventive measures should also be taken.

White rot of cucumbers in a greenhouse: treatment, photo, fight