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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 > Forest tent caterpillar

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Forest tent caterpillar

Malacosoma disstria

Forest tent caterpillar

Jeff Hahn, University of Minnesota Extension


Description: 2 inches long. Light blue head and blue and black body with yellow to white footprint-shaped spots on each segment and fine hairs on each side.

Where/When: Many hardwood trees including quaking aspen, birch, linden, and oak. Present May through June.

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