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The large orange, white and blue striped brown caterpillars of this moth feed in groups and can consume large areas of foliage on a wide range of deciduous trees. The damage usually not serious and the caterpillars can be tolerated.
Common name Lackey moth Scientific name Malacosoma neustriaPlants affected A wide range of deciduous trees and shrubsMain symptoms Defoliation, webbing and orange, white and blue striped brown caterpillarsMost active April to July
Lackey moth adults are mid-brown in colour and have a wingspan of approximately 30mm. They lay eggs in bands of 100-250 that encircle the stems of a wide range of deciduous trees and shrubs.
The hairy orange, white and blue striped brown caterpillars are up to 50mm long. They feed gregariously under webbing and can cause a significant amount of defoliation on their deciduous tree hosts.
The egg bands of this moth are often noticed on deciduous tree hosts in late summer. These hatch in April and the caterpillars feed gregariously under silk webbing and can be present until July when they pupate in leaf litter. The silk webbing and defoliation can be obvious at this time.
The adults emerge from July to September and soon lay eggs.
Defoliation is most severe on small trees, however it should not affect the long term health or vigour of host plants. If the eggs or caterpillars are spotted early on small trees they can be destroyed or removed to a larger tree. On larger trees whilst some parts of the plant may be defoliated this will have no effect on the long term health of the host. Therefore as the caterpillars and associated moths can be considered an important part of garden wildlife they can be tolerated.
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