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Lilac is one of the most popular ornamental shrubs. Above all, the wonderfully fragrant varieties of common lilac (Syringa vulgaris) are appreciated. The typical damage caused by the lilac miner's moth in May are brown leaves and numerous fine minerings in the leaves. The larger larvae leave the leaf interior and live on the leaf undersides of the leaf tissue. This is where the fight begins: remove the larvae-covered leaves and dispose of them with household waste. If the plant is heavily infested, which occurs only in isolated cases, you can use pesticides such as pest-free Careo or pest-free Calypso Perfect AF against the larvae.
In May, damage to the lilac leaves is visible through the miners (left), during the summer the leaves curl up. The drawings in the middle show the life cycle of the moth from the eggs, via larva and pupa to the butterfly
Life cycle of the miner moth
After wintering as a doll in the ground, the first moth moths appear from about April. The cinnamon-colored inconspicuous animals sit with clearly spread legs in an erect posture on the leaves. Green-colored larvae hatch from eggs deposited on the undersides of the leaves, which feed on the leaves and live there as miners. As a result, the leaves in these places, only visible as a gangway (gangue), later as a larger area (mine space). After growing up, the larvae eat out again, roll the leaves down using their spider threads and live on the undersides of the leaves. They also feed on the leaf tissue and switch to other leaves at night. When unrolling the leaves, the larvae are clearly visible with their dark droppings.
Missing lilac blossoms
If the flowers remain on the lilac, the causes can be manifold. In rainy years bacteria can be the cause of lilac. It leaves stripes on the young shoots, which are getting bigger and blacker. In the end, the tissue rots and the shoots buckle. In addition, brown leaves develop on the leaves, which look like grease stains. At the moment, there are no approved drugs to combat lilac disease. Inquire about resistant varieties when buying. Infested plants should be lightened and cut out diseased shoots. The bud disease, caused by a fungus, suppresses the bud formation or makes the buds brown and die. The leaves and shoots take care of, the branches turn brown and wither. On the other hand, you can inject several environmentally friendly copper compounds such as Atempo Kupfer-Pilzfrei as a preventative measure or at the beginning of the leaf fall in autumn.