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The caterpillars of lilac leaf mining moth feed within the leaves of lilac, privet and ash. This results in brown blotches on the leaves, the leaves then become rolled up from the tip.
Lilac leaf-mining moth
Adult lilac leaf mining moths have brindled white and brown forewings and the wingspan is 10-13mm. The caterpillars feed within the leaves of host plants and are greenish white and up to 7mm long when fully grown.
The larvae initially cause a large blotch mine which soon goes brown and shrivels. Each mine is occupied by several caterpillars which later leave the mine and cause the leaf to become rolled up from the tip. The leaf roll is held in position by silken threads and the caterpillars complete their feeding inside. The caterpillars pupate in silken cocoons spun on the underside of the leaf and the second generation overwinter as pupae.
There are two generations a year with damage occurring in June and August to September.
Leaf damage from this moth is usually light and can be tolerated. Although leaf mining damage may be considered unsightly, it is unlikely to affect the health or vigour of an established tree or shrub. In addition many leaf miners have parasites and predators which may be killed by spraying leading to a resurgence of the leaf miner or other pests.
If desired light infestations on lilac trees can be dealt with by picking off and disposing of mined or rolled leaves. Attacks on privet hedges can be much reduced by cutting the hedge. In the autumn fallen leaves from a badly infested lilac can be gathered and burnt to reduce the number of overwintering pupae. The waste plant material can be disposed of in council waste.
There are no insecticides that are suitable for controlling leaf mining insects, in home gardens, particularly on large plants.
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