What is gall aphid?
Red swellings appeared on the leaves of the red currant. What is it connected with? Currant leaves are obviously damaged by leaf gall aphids, it is also called red gall aphid. Basically, young leaves of red and white currants suffer from it. In spring and early summer, leaf aphids are wingless, later winged females appear, capable of flying over considerable distances. Aphid colonies are usually concentrated on the underside of the leaves. In places of damage, the leaf tissue on the upper side grows in the form of dark red swellings on the upper side. Affected leaves give a weak increase, their yield is significantly reduced. With a mass appearance, the leaves dry up and fall off.
Control measures against leaf gall aphids
To combat the leaf gall aphid, it is necessary to cut and destroy the leaves damaged by it. On blossoming leaves, it is better before the flowering of the berries or immediately after it, a soap solution (300 g per ten liters of water) or tobacco infusion is used against aphids. With a high number of these pests, they are destroyed using one of the following preparations: Spark (ten grams, or one tablet, per ten liters of water, only before flowering), Kinmiks (2.5 ml per ten liters of water), Aktelik (15 ml), Fosbecid, Fufalon – according to the instructions.
Predatory and parasitic insects (ladybugs, lacewings, etc.) destroy a significant number of aphids, therefore, with the mass appearance of these beneficial insects, one should refrain from using chemical agents to combat aphids.