How to Manage Pests
Pests in Gardens and Landscapes
Fall cankerworm—Alsophila pometaria
Cankerworm larvae have three pairs of prolegs. They are greenish above, with three narrow, whitish stripes
and one yellow stripe along the side of the body; underparts are light green. Cankerworms frequently stand
on the posterior pair of prolegs in such a way as to resemble a small twig.
Cankerworm larvae are primarily leaf feeders, tending to skeletonize leaves. Occasionally they feed on
young fruit by biting deep holes, which later heal, but leave large scarred depressions similar to the
injury caused by green fruitworms.
On small trees, cut out and destroy infested twigs. If populations
are high, applications of Bacillus
thuringiensis or spinosad may be helpful.