2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Powdery mildew is a dangerous fungal disease of squash, which occurs in most cases in the non-chernozem zone. In addition to zucchini, this ailment can also affect squash with pumpkin. It is especially harmful in case of insufficient watering, as well as in conditions of high air humidity. And powdery mildew affects mainly stems with leaves. You should deal with it immediately after its identification, otherwise the consequences can be quite dire
A few words about the disease
On old squash leaves attacked by powdery mildew, more precisely, on their upper sides, white, rounded specks begin to form. Gradually, the number of such spots increases along with their size, and they begin to merge and move to the lower sides of the leaves, as a result of which the leaves are completely covered with a thick powdery and whitish bloom. The color of strongly affected leaves changes from dark green to lighter - most often they turn yellowish-greenish, gradually darkening and wrinkling. And young leaves, together with infected stems, become underdeveloped, chlorotic and may even die off entirely.
Zucchini fruits on lashes attacked by the scourge ripen ahead of time and are characterized by insufficient sugar content and a rather bad taste. As a rule, they are tied up late and often remain also underdeveloped.
The causative agent of the harmful disease develops mainly on the tissues of vegetation, affecting the planted crops from the very beginning of their growth. Powdery mildew attacks squash plantings especially strongly in case of frequent dew loss.
How to fight
When growing zucchini, it is very important to follow the rules of crop rotation, returning them to their original places at least three to four years later.
Growing zucchini, if signs of powdery mildew are detected, are treated with a 1% suspension of colloidal sulfur or 3.5% copper sulfate solution. A good effect can be achieved by spraying with a solution of soda ash with the addition of a small amount of soap or ammonium nitrate solution.
Among the effective chemicals for the fight against powdery mildew, marrow can be distinguished such as "Bayleton", "Sulfarid", "Topaz", "Topsin-M". The fruits treated with chemicals should then be thoroughly rinsed with warm water to remove the remnants of the products used from their surface.
There are several bacterial ways to combat zucchini powdery mildew. They consist in spraying zucchini plantings with an ash solution, mullein infusion or hay infusion. To prepare an ash solution, one kilogram of sifted clean ash is mixed with ten liters of water. The mixture, stirring occasionally, is insisted for a week. And in order for the solution to better adhere to the leaves during processing, a little soap is added immediately before it is carried out. To obtain an infusion of mullein, a kilogram of raw materials is dissolved in three liters of water. The composition is infused for three days, after which it is immediately filtered and diluted with plain water (in three liters of water - a liter of infusion). Well, with hay infusion, evening treatments are mainly carried out, and it is better to carry them out even before a mealy bloom appears on the zucchini leaves. A kilogram of well-rotted hay, filled with three liters of water, is also infused for three days, and then the thoroughly strained infusion is diluted with water. After seven to nine days, this spraying is repeated.
You should also not forget about the folk methods of dealing with a dangerous ailment. To prepare a salvage solution, herbs such as woodlice (or stellate), dandelion, ivan tea, celandine, plantain and coltsfoot with nettles are collected. Two kilograms of chopped raw materials are poured with hot water in a small amount, thoroughly ground, mixed, and then added to ten liters with warm water. Two or three days later, the solution is filtered and a teaspoon of liquid soap and urea is added to it. If there is no urea, then it is permissible to replace it with potassium permanganate in the amount of 1 g. The squash plantings are treated with the resulting solution twice, observing an interval of five to six days.
After harvesting, the beds are abundantly sprayed with a solution of copper sulfate (prepared at the rate of three tablespoons per liter of water). The same is done in the case of plant death.
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