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The caterpillars of laburnum leaf mining moth feed within the leaves of laburnum and occasionally lupins. This results in a brown circular blotches on the leaves.
Laburnum leaf mining moth
The adult laburnum leaf mining moth has a wing span of 8-9mm, the forewings are white with yellowish-brown with purple markings at the wing tips. The caterpillars feed within the leaves of host plants, are greyish white and up to 6mm long when fully grown.
The shape of the leaf mine caused by the caterpillars of laburnum leaf mining moth is a circular blotch which, when fully developed, can be seen on the upper leaf surface as a brown area about 10-15mm in diameter. It is the only leaf mining moth likely to affect Laburnum in Britain.
There are usually two generations of the moth during the summer, with caterpillars feeding in late June-July and in September. In hot summers there may be a third generation. Heavily infested leaves can contain several mines which coalesce and so no longer show the typical shape of the mine. If a mined leaf is held up to the light, a spiral grooving can often be seen within the mine.
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.
There are no insecticides that are suitable for controlling leaf mining insects, in home gardens, particularly on large plants.
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