Leaf miners are basically the
larvae of a small moth species called Caloptiliasyringella. These pests bore
tunnels between the leaf layers, thereby giving a blotched appearance to the
leaves during the start of summer. Subsequently, lilac leaf miners turn over
the leaves and feed on them externally. Eventually, the color of the affected
leaves become brown, thereby giving a burnt appearance to the entire plant.
When the first sign of leaf miner
assault becomes evident, you can soak the leaves with neem or a nicotine spray.
However, when you notice the damage, it is already very late to take curative
actions. Nevertheless, you should immediately remove the affected leaves and
clear the area beneath the shrubs of all leaves and debris during the fall with
a view to protect the plants from being infected again. In fact, the damage
caused by lilac leaf miners is more aesthetic compared to physiological. S.
vulgaris or the common lilac is most vulnerable to invasion by leaf miners.
Examples of Insecticides (Acephate – Cyfluthrin – Imidacloprid- Insecticidal