Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Caterpillars, maggots, grubs, and similar immature insects - 1/4 inch - 1/2 inch long > Columbine sawfly
Size: Up to 3/4 inch long
Where/When: Feeds on columbine foliage, starting along the edge of the leaf. Active during May.
Significance: May eventually defoliate columbine except for the larger veins.
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