Reasons for appearance
Powdery mildew fungus prefers the first hot days of summer, when the spores finally wake up after winter. It is spread by direct contact, wind or droplets of water. Currants suffer more from changes in humidity, after improper pruning or due to an excess of nitrogen.
Photo: 2sotki.ru
Fungicide Quadris: description, instructions for use
Consequences
Powdery mildew is a dangerous disease for black currants. If you do not attach importance to its first signs and do not eliminate the problem in the early stages of the development of pathogenic microflora, then you can lose not only the crop, but also the entire bush, and if spores spread massively, an entire crop plantation. Read about currant diseases here.
Eating berries from an infected bush can be dangerous for humans. With high sensitivity to fungi, allergic reactions of varying intensity are likely to develop.
How to recognize the disease
The symptoms of powdery mildew correspond to its name. The leaves are covered with a white and powdery coating - these are mycelium. It spreads in spots and gradually spreads to shoots and fruits.
Most often, powdery mildew is first noticeable on the lower leaves, and then rises from there. Later, small drops appear on the spots, and then they turn completely brown. Currant shoots become bent and leaf blades become smaller.
Photo: 2sotki.ru
Diseases of grape leaves: descriptions with photos, treatment
Chemicals: how to treat?
Although powdery mildew spreads easily through currants, fungicides effectively control it. Any specialized drug will do, so we’ll talk about a few of the most common and effective ones!
Copper sulfate
This is the main remedy for combating powdery mildew on currants, so it can be used in its pure form. You will need 100 g per bucket of water, and the prepared liquid can be used for irrigation.
Photo: sanpros.ru
inkstone
Iron sulfate can also be used to kill powdery mildew. But its concentration should be higher - up to 300 g per bucket, but otherwise the rules of application are the same.
Photo: vseprodachu.ru
Bordeaux mixture
This is the most universal drug that every gardener probably has in his arsenal. It helps not only against powdery mildew, but also against a number of other fungi, diseases and parasites.
Photo: ferma-biz.ru
Score
A broad spectrum fungicide suitable for all types of crops and is not afraid of rain. But it must be used at least 3-4 weeks before harvest.
Photo: fermerss.ru
Topaz
An effective and versatile fungicide that stops the development and spread of spores. You only need 2 ml per bucket, but check the instructions first. Topaz is used prophylactically at the beginning of the season, and then as needed.
Photo: voteregion-ntf.ru
Fitosporin
A drug with a mild effect is gentle, but at the same time gives a good result. For convenience, it is available in liquid, powder or paste form.
Photo: ya-fab.ru
Byleton
The fungicide has average toxicity to humans, but is safe for bees. In addition to destroying powdery mildew, Bayleton improves the immunity and resistance of currants to stress.
Photo: maja-dacha.ru
Fundazol
The drug is very good for berry bushes, and is also suitable for prevention and treatment. The first treatment must be carried out before flowering, and the last one after harvesting the currants.
Photo: greensotka.ru
Resistant and unstable varieties
Currant varieties react differently to the sphere library: some do not get sick at all, others show high or medium resistance, and some show strong susceptibility.
Expert opinion
Stanislav Pavlovich
Gardener with 17 years of experience and our expert
Ask a Question
IMPORTANT! The most effective way to get rid of powdery mildew is to plant plants with absolute genetic immunity or high resistance to infection. Many modern varieties of black, white and red currants have this quality.
Resistant to powdery mildew
Black currant:
- Belarusian sweet;
- Venus;
- Hercules;
- Glariosa;
- Dobrynya;
- Fun;
- Mystery;
- Kanahama;
- Creole;
- Ksyusha;
- Kudmig;
- Lama;
- Litvinovskaya;
- Lucia;
- Mila;
- Myth;
- Orlovia;
- Natasha;
- Nika;
- Nyursinka;
- Pygmy;
- Bow to Borisova;
- Rachel;
- Mermaid;
- Sadko;
- Sevchanka;
- Selechenskaya 2;
- Sibylla;
- Nightingale Night;
- Sagittarius;
- Black stork;
- Shaman;
- Vigorous.
Belarusian sweet
red currant:
- Valencia;
- Valentinovka;
- Dana;
- Gift of the Eagle;
- Jonker Van Tets;
- Red Andreichenko;
- Ilyinka;
- Cream;
- Marmalade;
- Beloved;
- Lights of the Urals;
- Osipovskaya;
- Gift of Summer;
- Jumper;
- Ural beauty;
- Ural souvenir.
White currant:
- Bayan;
- White Fairy;
- Belyan;
- Minusinsk white;
- Ural white.
Bayana
Folk remedies: how to fight?
If you don’t want to treat your garden with chemical pesticides or powdery mildew has just appeared, then you can get by with folk recipes. We tell you some of the most effective ones specifically for currants!
Ash
Pour half a glass of ash with a liter of boiling water, let it brew for 2 days, add a little soap. You can process currants at intervals of a week as many times as needed.
Photo: postroykundo.ru
Potassium permangantsovka
Add 5 g of potassium permanganate to a bucket of water and spray the currants as the disease develops. Such a solution will not destroy powdery mildew, but will stop its spread.
Photo: biobirsk.ru
Green manure
Fill half a bucket of green manure and garden weeds with hot water to the edge of the container and mix. The solution should sit for a couple of days and begin to ferment, and then strain it and spray the currants.
Photo: zen.yandex.ru
Kitchen soda
A solution of ordinary soda is not very effective for treatment, but it will be a good prevention. You need 2 tbsp per bucket of water. and a little grated soap so that a film remains after spraying. This product can be used up to 5-6 times a season.
Photo: homestratosphere.com
Soda Ash
For a liter of liquid you only need less than a teaspoon of soda ash and the same amount of soap. Mix the solution well and spray the currants twice with a week's break.
Photo: npks.su
Iodine
Dilute 10 ml of pharmaceutical iodine in a bucket of water and use the solution to treat currant leaves. If powdery mildew has spread, then you can increase the concentration a little.
Photo: nadoremont.com
Mullein
Fill a third of a bucket of mullein with cold water to the brim and put it in a dark place for 3 days. In order for the medicine to infuse faster, it must be stirred periodically. Filter the solution, dilute 1:10 with clean water and immediately use for evening treatment.
Photo: 1xbet.monster
Fermented whey
Whey from kefir or sour milk is diluted with water 1:10 and stirred thoroughly. That's all - the solution is ready for use against powdery mildew!
Photo: vk.com
Why do eggplant leaves turn yellow and dry?
Preventive measures
Prevention of powdery mildew is:
- compliance with recommendations regarding the planting pattern of blackcurrant seedlings, as well as the distance between bushes (1-1.5 m) and rows (2-3 m);
- choosing the right site for growing crops;
- disinfection of cuttings or seedlings to be planted in a solution of copper sulfate;
- loosening the soil around the plant in autumn and spring;
- timely removal of weeds;
- moderate watering taking into account weather conditions and soil conditions;
- mandatory annual pruning of bushes;
- timely removal of parts of a plant or an entire bush at the first signs of serious diseases;
- recycling of crop waste;
- the use of antifungal agents on diseased bushes;
- correct selection of crops growing near currant bushes.
Prevention of powdery mildew is mandatory even if there are no signs of it on currant bushes. Read about ash as fertilizer on the site at this link.
Prevention of powdery mildew on currants
Fungal spores overwinter safely in old leaves, so plant debris should always be removed at the end of the season. Carry out anti-aging pruning on time and carefully, because it temporarily reduces the plant’s immunity. When planting, do not plant the bushes too close, so that in the future they will not be crowded.
Apply nitrogen fertilizers at the time recommended by the manufacturer and strictly according to the dosage. Their excess also contributes to the development of powdery mildew, especially during budding. But the resistance of currants is increased by planned fertilizing with potassium and phosphorus.
All affected and frozen currant shoots must be cut out. At the beginning of the season, before flowering and after harvesting, carry out routine spraying with fungicides.
Photo: luckclub.ru
Did you like the post? Subscribe to our channel in Yandex.Zen, it really helps us in our development!
