You do not know why red and brown spots appeared on the leaves of your current? We will tell you what is the cause of this ailment and how to eliminate it. If red spots on currant leaves appeared in spring or summer, then it is likely that your berry bushes attacked diseases and pests. Let’s see what kind of adversity leads to the reddening of the leaves.
Reason 1: Gall Aphids on Currant
If red convex (swollen) spots appeared on the leaves of the current, and young shoots curved, then most likely the plant attacked the aphid, which sucks the juices from it. As a result, currant leaves are covered with red-brown spots and swellings. The leaf plate is deformed, the young leaves coarse, the plants stop growing.
Colonies (larvae) of this insect are easily found on the underside of leaves (especially young ones), as well as on shoots where the pest hibernates. The winged female aphids fly to other plants in the garden and live there until the end of summer. Then they again return to the currant bushes, lay eggs on it (in the bark, where leaf buds are outlined) and in the spring destroy the bush again.
How to Deal With Aphids on Currants?
All damaged leaves must be cut off immediately. If you noticed aphids on the current at the time of ripening, then chemical preparations are not recommended. It is better to use decoctions and infusions of plants: chamomile, yarrow, tobacco or shag, garlic, and others. For better adhesion of infusions to 10 liters of water, add 40 g of soap.
To destroy aphid eggs, bushes before budding need to be abundantly poured with hot water or treated with an insecticide (you can use Fufanon, Decis, Iskra, Inta-Vir, Kinmiks, etc.). Aphids are destroyed by ladybugs, two-tails and lacewings. So that these insects often looked into your garden, plant nectar-bearing plants.
After the autumn pruning, all places of the cuts need to be covered with garden varieties, since it is in the cracks on the bark that these pests love to lay their eggs. For the prevention of aphids on currants in the spring after the appearance of young leaves (but before flowering), it is recommended to spray the plants with a 1% solution of Bordeaux fluid.
Reason 2: Currant Anthracnose
Red spots on the leaves of red, black and white currants may appear due to anthracnose. This fungal disease inhibits the growth of shoots on a shrub, reduces the yield and taste of berries.
At the first stage of this disease, red spots on the leaves or plaque with shiny tubercles appear on the current. Then these spots merge and become brown, and the leaves on the shrub turn yellow and dry. The leaves of the red currant soon fall off, while the black currant can hang on the branches in such a damaged form until late autumn. Over time, the disease spreads to the fruits.
Fungal spores winter in fallen leaves and spread in rainy weather. In hot and dry summers, currants rarely get sick.
The Fight Against Current Anthracnose
In the spring, before buds open, it is necessary to treat the bushes and the soil beneath them with a 1% solution of Bordeaux fluid. Repeated spraying should be carried out 2 weeks after harvesting. In autumn, you should destroy all plant residues (fallen leaves, damaged and old branches) and mulch, burn them and dig the soil under the bushes. And after these procedures, spray the bushes and soil with 3% Bordeaux fluid.
Now you know how to treat the bushes if red spots appeared on the leaves of the current. We hope these tips will help save your plants and not lose your crop.