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Powdery mildew on black and red currants: how to recognize and fight


For a berry such as blackcurrant, powdery mildew is one of the main pests. Powdery mildew is also called oidium - it is a fungal disease that affects blackcurrant bushes, gooseberries, less often white and red currants. Powdery mildew (namely, this fungal disease was introduced from there) affects the leaves and fruits of the plant, and with prolonged presence can lead to its death.

Causes and signs of powdery mildew

Powdery mildew on currants is a consequence of the presence of a parasite fungus, which most often settles in the ground near the root of the plant. This fungal disease is not afraid of severe frosts, so if you do not try to remove it for the winter, then in the spring it will again begin to spoil the berries and the entire currant bush.

Powdery mildew on the currant appears in the form of a silver coating, which sparkles in the sun with wet drops. If the plant is not treated in time, its leaves will soon begin to curl, the ovary will fade, and the berries will simply fall off before they ripen. The plant affected by powdery mildew begins to weaken greatly by the end of the season and, under adverse conditions, dies in the winter.

Fungal disease has a large number of varieties. For example, if powdery mildew is detected on cucumbers or a rose, then it is not necessary that it will hit nearby growing bushes of berries.

The spores of the fungus fall on the foliage of the plant using the wind. At high air temperatures (in the summer), the spores burst, and the mycelium penetrates directly into the stems of the plant. It is at this moment that a fungal infection begins to destroy the plant, leading to its death.

Powdery mildew is considered one of the most intractable diseases, despite her thorough study and the creation of a large number of drugs aimed at combating it. When a plant is affected by a fungal disease, leaves and branches become covered with a coating that cannot be wiped off manually. After the defeat, the bush begins to slowly fade, ceases to bear fruit. Any top dressing will not save the situation, but only exacerbate it. That is why it is so important to treat blackcurrant from powdery mildew in time in order to preserve the plant and yield.

Powdery mildew on currants: description

Fight with powdery mildew on a plant

Today, there are a large number of tools that help fight mildew in the prophylaxis stage and when the fungus has already appeared on the plant. In particular, solutions are used for processing, which, when used correctly, help prevent the destruction of the plant and remove the fungus from it. Processing must be done on all sides of the currant bush, so that the liquid gets on the upper and lower sides of the leaves. It is possible to spray liquid from a special apparatus, a spray bottle or by means of a large brush for whitewashing the walls. In extreme cases, you can use a broom and a bucket, the main thing is that the plant is processed from all sides.

The berry needs treatment from powdery mildew at different stages of its development. It must be sprayed with chemicals in dry weather, preferably in the evening. A repeated procedure is carried out after 1 week, and so on until the signs of the disease completely disappear.

Effective preparations for powdery mildew are:

  1. "Topaz". Refers to fungicides, aimed at combating fungal diseases. It has a wide range of effects, so it can be used to spray currant bushes, cucumbers, gooseberries, roses, grapes, etc. The drug is sold in ampoules, the contents of which are diluted with water before use. The product protects the treated plant for 2 weeks, after which the treatment must be repeated if necessary.
  2. Sulfaride. It is a universal tool for treating plants from ticks and powdery mildew. Processing is carried out 2 times per season. The first time the currant is processed during the appearance of buds, and the second after the flowering of the bush.
  3. "Tilt KE." Designed to treat plants from powdery mildew as a preventative measure and during infection. The main difference from other drugs is the rapid penetration of substances directly into the plant, so that the product does not wash off even when it rains soon after spraying.

All these drugs have an average degree of toxicity for people, so at the time of working with fungicides, the face and hands must be protected with a mask and rubber gloves.

Folk remedies

People learned how to fight fungus with folk remedies that are not toxic, but are harmful to many pests.

A solution of soap and soda. To prepare the solution, you can take soapy residues, put them in a plastic container and pour warm water. After a day, the soap solution will be ready, after which you need to add soda in the proportion of 50 g per 10 l of water. After preparing the solution, it should be poured into a spray bottle and the whole currant bush should be completely treated. You can take whey, dilute with water 1:10 and treat the plant at least 3 times for 3 days. Copper sulfate (5 g) must be diluted in 250 ml of hot water, add 5 l of soap solution, introducing diluted vitriol with a thin stream, and treat the currant bush.

How to deal with powdery mildew

Dry mustard, diluted with water in a ratio of 1: 5, is used to treat plants from powdery mildew and for feeding. Effectively against other pests. Colloidal sulfur, diluted with water at the rate of 20 g per 5 l, is used to prevent the appearance of pests on currants and to eliminate those. The product is not suitable for processing gooseberries. At the initial stage, you can use folk remedies for powdery mildew on currants, but if the result is not achieved, it is better to use special drugs that act more aggressively on the pest.