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Signs of infestation are webs wrapped around the foliage, silken threads between leaves and possibly a visible cocoon on the tree. Sometimes the caterpillar may be seen on the undersides of leaves.
Recommended treatment is to cut away infected branches or, before the damage becomes really serious, apply tar oil. Also, halfway through spring, when the caterpillars shed their skins, an application of organophosphate contact insecticide may be applied.
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