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Extension > Garden > Diagnose a problem > What insect is this? > Trees and shrubs > Caterpillars, maggots, grubs, and similar immature insects - 1 to 2 inches long > Fall cankerworm

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Fall cankerworm

Alsophila pometaria

Colorado potato beetle

Jeff Hahn, University of Minnesota Extension


Description: 1 inch long. Light green with light lines to dark brown with a black stripe on back, 3 pairs of prolegs.

Where/When: Attacks a wide variety of hardwood trees, including apple, ash, basswood, black cherry, boxelder, elm, hackberry, maple, and oak. Present late April to June.

More information on Fall cankerworms

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