Rahul Sharma (Editor)

Alsophila pometaria

Updated on
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Kingdom  Animalia
Class  Insecta
Family  Geometridae
Scientific name  Alsophila pometaria
Phylum  Arthropoda
Order  Lepidoptera
Genus  Alsophila
Rank  Species
Alsophila pometaria Fall Cankerworm Moth Alsophila pometaria BugGuideNet
Similar  Alsophila, Paleacrita vernata, Operophtera bruceata, Operophtera, Campaea perlata

Fall cankerworm moth geometridae alsophila pometaria gravid female

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.


Alsophila pometaria Alsophila pometaria Guide to Nursery and Landscape Arthropod Pests

Fall cankerworm moth geometridae alsophila pometaria female with eggs


Alsophila pometaria mothphotographersgroupmsstateeduFiles1LiveCL

The caterpillars grow to about 25 mm long. In color, they vary from light green to a dark brownish-green. Light green caterpillars have white lines running down the body from the head to the tip of the abdomen while the darker caterpillars have a black stripe the length of their back. Larvae have three pairs of legs on their thorax and three pairs of prolegs on their abdomen. The first pair of prolegs is much smaller than the last two pairs. The pupa is wrapped in a silk cocoon and is buried just beneath the surface of the ground.

Alsophila pometaria Alsophila pometaria Fall Cankerworm Moth Discover Life

Adult males have a 25–35 mm wingspan. The forewings are glossy brown and crossed with irregular white bands. The females are brownish-gray, wingless, and 10–12 mm long. Eggs are grayish brown with a dot and ring on the top and are less than 1 mm in diameter.


The larvae feed on a large variety of deciduous trees and shrubs, including Ulmus, Fraxinus and Acer. Other recorded hosts include hackberry, oak, various members of the rose family, walnut and willow. The larvae hatch and are active in the spring. These insects are called fall cankerworms because the females emerge from the soil in November, mate and lay their eggs in clusters on hardwood trees.

There are some natural enemies of this species. Many birds eat the caterpillars. The ground beetle, Calosoma frigidum also feeds on the caterpillars. The wasp, Telenomus alsophilae, parasitizes the eggs.

Economic Importance

The larvae, called loopers or inchworms, are considered a serious pest of many tree species because they can cause major defoliation in the new spring growth. If defoliation occurs two years in a row, the tree can die, especially if it has been stressed by drought.


Alsophila pometaria Wikipedia

Similar Topics
Campaea perlata
Operophtera bruceata