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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Beetles, bugs, ants, and other insects without obvious wings - Larger than 1/2 inch long > Blister beetles

Blister beetles
Photo Credit: Mary Lou Marchand Blister beetles
Photo Credit: Jeff Hahn, Univ. of MN

Blister beetles
Lytta sayi
Size: 1/2 – 3/4 inch long

Where/When: Feeds on flower blossoms of iris and lupines. Other species feed on leaves of several legumes such as peashrub (caragana), alfalfa, and also potato.

Significance: Large numbers may defoliate plants. Defensive oil (cantharidin) may be highly irritating when handing beetles, however garden blister beetles generally have lower concentrations.
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