Red spots on currant leaves: how to treat
Currants are not only tasty and healthy berries, but also some not very pleasant surprises. Like all plants, it can turn yellow and dry. But sometimes the leaves become covered with red spots, which drive inexperienced gardeners into a real panic. To save your nervous system, we hasten to tell you what it is and how to process the bush!
A fungal disease affects the leaf plates with small and chaotic red spots. Gradually they become larger, change their shade and become covered with a brilliant coating. At later stages, small spots merge into one, the leaves dry, and the disease passes to the crop.
Although anthracnose begins with leaves, it can affect all parts of the plant. For example, on berries it appears in the form of brown small spots with a purple border. The bushes are prematurely exposed, the yield decreases many times, and in the worst case, currants can die. Due to anthracnose, bushes become more sensitive to frost.
What to process?
In the autumn, be sure to remove plant debris, because this is how spores winter, and not only anthracnose. In the spring and after harvest, treat the currants with Bordeaux liquid. For treatment, use specialized fungicides - Fundazole, Previkur, Profit Gold and others.
Gall aphid on currant
If red spots are deformed and swollen, and young shoots are lagging behind in development or are bent, turn several leaves on the back side. Most likely, you will see feasting colonies of aphids, which sucks all the juices out of the plant.
Gall aphid is also called redcurrant, therefore, it practically does not occur on black. But blackcurrant is attacked by another pest - gooseberry aphids. Because of it, young leaves are first curled at the tops of the shoots.
Visually seeing aphids is quite difficult, because it is very small. Therefore, few people manage to detect the pest on time - usually there are already too many of them.
Swelling on the leaves is formed due to the reaction of currants to damage, and in essence they are neoplasms. Young leaves suffer the most, because the old ones are harder and it’s harder for aphids to pierce the surface.
What to process?
Aphids can first be carefully washed off with water or a soap solution, and then treat the currants with insecticides - Fitoverm, Aktofitom or analogues. Flushing may seem like a dubious method, but in fact it can kill up to 90% of the colony. We recommend removing too damaged leaves and shoots, and treat the cuts with charcoal or garden varieties.
Most often, aphids do not require strong pesticides, because its shell is very soft. Safe organic compounds are suitable for destruction. For example, herbal infusions, essential oils, infusions of garlic or tobacco. So that the liquid envelops the leaves and lingers on them longer - add about 40-50 g of soap to the bucket of the solution.
Spring treatment of currants from red spots
In spring, treat the garden with a weak solution of Bordeaux fluid twice with an interval of 2 weeks. For the first time, it is important to catch up to the moment when the buds begin to bloom - this is the prevention of fungi. But the second treatment after the appearance of young leaves will protect against overwintered aphids.
Summer processing of currants from red spots
When currant berries begin to form on the bushes, pesticides should never be used. Otherwise, they will accumulate in the structure of the fruit and then will go straight to your table. If the harvest is already close, and the problem is just beginning, we recommend that you wait, gradually removing the damaged leaves.
If shrubs still need to be treated, use the mildest. An infusion of dandelions, celandine, tomato tops, onions or garlic is suitable. Plant small flower beds of aromatic herbs near the currant to attract ladybugs and lacewings - natural aphid enemies.
For anti-anthracnose treatment, use fungicides no later than two weeks before harvesting. Be sure to loosen and weed the beds so that there are no weeds and air can circulate.
Autumn processing of currants from red spots
In the autumn, first of all, collect and burn all the dry leaves from under the currant bushes. Dig the soil for the last time, carry out sanitary pruning and thin out crowns that are too thick. Treat slices with garden varieties, spray shrubs and the ground around with insecticides or copper-based products.