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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Beetles, bugs, ants, and other insects without obvious wings - 1/4 inch - 1/2 inch long > Bean leaf beetle

Bean leaf beetle
Photo Credit: Jeff Hahn, Univ. of MN Bean leaf beetle
Photo Credit: Jeff Hahn, Univ. of MN

Bean leaf beetle
Cerotoma trifurcata
Size: 1/4 inch long

Where/When: Feeds on leaves of snap peas (string peas, green beans). Also, on soybean, clover, and other legumes. Adults are active mid-May to early June and mid-July through September.

Significance: Low numbers usually not injurious. High numbers can defoliate plants and kill young seedlings; they can also reduce vigor and yield of plants. Feeding on bean pods later in season is usually just cosmetic.
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