The caterpillars are capable of causing serious stress to their host trees; newly planted trees are particularly vulnerable. Leaves lost to caterpillar feeding this spring must be replaced using energy stored from last season. Small nests can be eliminated digitally using five-fingered "smash and/or smear" techniques. Less hands-on methods include applications of the naturally occurring bacterium, Bacillus thuringiensis (Bt), applied to early instar stages, as well as standard insecticides labeled for general caterpillar.
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