Figure 1. Mature fall cankerworm larva in a classic “looper” position. Note reduced proleg on fifth abdominal segment. Fall cankerworm, Alsophila pometaria (Harris), is an insect that feeds on the foliage of many species of broadleaf trees. It is native to North America and populations periodically build to outbreak levels that cause extensive

2023年4月14日 · When more dark colored caterpillars are seen, it may be a sign of a heavy infestation. Larvae have three pairs of legs on their thorax and three pairs of prolegs on their abdomen. The first pair of prolegs, when looking back from the head, is …

Fall cankerworm (Alsophila pometaria) is a common native pest in Massachusetts. The caterpillar (larval) stage feeds on the leaves of hardwood trees, and the adults emerge as moths in the fall (thus the name fall cankerworm). Populations of fall …

Alsophila pometaria, the fall cankerworm, is a moth of the family Geometridae. It is found in North America from Nova Scotia west to Alberta, south to Colorado and California and zones of Spain. The caterpillars grow to about 25 mm long. In color, …

Fall cankerworms emerge as adult moths in late fall. The wingless females crawl up tree trunks onto branches, are mated by winged males, and then lay single‑layered masses of flower‑pot shaped eggs on limbs and trunks.

The fall cankerworm is a closely related defoliator of many deciduous trees and shrubs in various types of rural and urban tree stands and plantings. Infestations occur often and affect both large and local areas. Damage by the fall cankerworm usually begins in late May when young larvae chew small holes (shot-holes) in the developing leaves.

The fall cankerworm, Alsophila pometaria, is a native defoliating insect found throughout much of North America. The caterpillar stage of these insects is often referred to as inchworms or loopers.

Cankerworms are caterpillars of several North American moths that have wingless females. Cankerworms feed on the buds and leaves of trees in early spring and can be a major pest. Elm, oak & apple are favorites. However, wide varieties of tree species may be susceptible.

Fall cankerworm caterpillars have three pairs of abdominal legs; spring cankerworms have two. Caterpillars of both species feed on oaks, maples and hickories. Both species hatch in the spring. While young larvae only make holes in leaves, older caterpillars consume most of the leaf.

Also known as inchworms or spanworms, cankerworms are commonly confused with caterpillars, but there are some stark differences between the two insects. Like caterpillars, cankerworms have unique characteristics and eating habits, which include: Cankerworms have what is described as a …