The Virginia Pest Management Guide (PMG) series lists options for management of major pests: diseases, insects, nematodes, and weeds. These guides are produced by Virginia Cooperative Extension and each guide is revised annually. PMG recommendations are based on research conducted by the Research and Extension Division of Virginia Tech, in cooperation with other land-grant universities, the USDA, and the pest management industry.

Fall cankerworm (Alsophila pometaria) is a native North American defoliating insect that feeds on a wide range of broadleaf trees, particularly oaks in Virginia. This publication explains how to identify adult moths and larvae, distinguish fall cankerworm from the similar spring cankerworm, and recognize signs of infestation and tree damage. It describes the insect’s life cycle, seasonal activity, distribution, and history of outbreaks, including impacts on forests and urban landscapes. The publication also outlines the effects of repeated defoliation on tree health and presents management strategies, including biological controls, insecticide treatments, Bacillus thuringiensis var. kurstaki (Btk), and tree banding for monitoring and control.