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Extension > Garden > Diagnose a problem > What insect is this? > Trees and shrubs > Caterpillars, maggots, grubs, and similar immature insects - Longer than 2 inches > Carpenterworm

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Carpenterworm

Prinoxystus robiniae

Carpenterworm

Jeff Hahn, University of Minnesota Extension


Description: 3 inches long. Pinkish to greenish white caterpillar with brown head and black mandibles.

Where/When: Tunnels under bark and into heartwood of hardwood trees. Preferred hosts are ash, boxelder, black locust, elm, oak and willow. Present July through May.

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