2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
European gooseberry powdery mildew sometimes affects red currants. In the past few years, European powdery mildew has been encountered much less frequently than American. Nevertheless, if an infection with it did occur, this attack spreads very quickly during the growing season. The appearance of white berries on the gooseberry bushes should be an alarm bell - if any were found, you should start fighting the harmful disease immediately
A few words about the disease
On the leaves of red currants and gooseberries affected by European powdery mildew, a light white bloom is formed, which looks like a cobweb.
A loose white bloom gradually turns into a dense brownish crust. The leaves, quickly turning yellow, begin to curl up and break, the infected shoots bend and die, and the cracked berries crumble without ripening.
The entire berry crop can easily die from European powdery mildew. And if you neglect the measures to get rid of this ailment, then literally in a few years you can lose all the berry bushes.
The causative agent of European powdery mildew is a pathogenic and very dangerous fungus that spreads by conidia throughout the summer.
How to fight
Berries and shoots affected by European powdery mildew should be picked or cut and immediately destroyed. Both in the fall and in the spring, the soil under the gooseberry bushes should be dug up, and in the spring it is also mulched.
To increase the resistance of berry plantings to European powdery mildew will help to take good care of them in combination with high agricultural technology. A good solution would be the selection for growing the varieties that are most resistant to this scourge, among which it is worth noting such as Chernomor, Eaglet, North Captain, English Yellow, Consul and some others. It is also generally accepted that the fewer thorns on the gooseberry bushes, the less resistant they are to European powdery mildew.
In most cases, fungicide spraying is used against European powdery mildew. Before the start of blooming of gooseberry buds, the soil and berry bushes are sprayed with "Nitrafen" (such spraying is called eradicating). It is also allowed to process gooseberry bushes with iron vitriol (three percent solution: for ten liters of water - 30 g). By the way, a solution of ferrous sulfate can be replaced with a one percent solution of copper sulfate (ten grams of the product are taken for ten liters of water to prepare it). Such drugs as "Topaz", "Horus" and "Fundazol" will also be excellent helpers.
Immediately, as the gooseberry fades, as well as when the first signs of an illness are detected, soda ash treatments are carried out twice or three times, observing a ten-day interval. To prepare such a solution, it is necessary to combine 5 g of soda with ten liters of water and 50 g of soap.
The bacterial control method has also proven itself quite well in the fight against European gooseberry powdery mildew. Well-rotted manure should be poured with water (in three parts) and this mixture should be infused for three days. Next, the resulting infusion is diluted with water in a ratio of 1: 2, after which it is filtered and you can start processing the affected berry bushes. This method is based on the ability of bacteria living in manure to suppress powdery mildew and destroy it. If the need arises, such processing is allowed and repeated, but only after the harvest of juicy berries has been removed. And it is better to try to carry out such spraying in cloudy weather or in the evening.
There is another rather interesting "grandmother's method" of dealing with European powdery mildew: first, three liters of milk are fermented, and then the sour milk is placed in a water bath. The whey is separated from the resulting curd mass and diluted with water in a ratio of 1: 3 or 1: 5. In principle, you can simply pour all the resulting whey into a bucket of water - its concentration in this case will also be quite acceptable. Then gooseberry bushes are sprayed with the resulting solution to the very ground, without missing a single twig and not a single leaf. Often, one such treatment is enough, however, for preventive purposes, it is still better to carry it out two or three times. It is especially pleasant that such a recipe is not capable of harming even berries growing on the bushes.
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