Blister Beetle

Blister beetles can be both friend and

Foe: Adults feed on garden plants;

Larvae eat grasshopper eggs.

Last Seen in the Vicinity of . . .

North America.


Large numbers of adults feeding on flowers and foliage of many types of flowers, shrubs, and vegetables rapidly defoliate plants. Larvae of most species are beneficial because they prey on grasshopper eggs.

Blister Beetle


Adults are metallic black, blue, purple, or brown beetles, 3?4 inch long, with soft, elongated bodies, narrow “necks,” and long legs. The youngest larvae are tiny, narrow, elongated grubs with large heads; later stages are progressively fatter with smaller heads and shorter legs.

Crime Prevention

Protect plants with floating row covers or screens in midsummer.


Except in areas where large adult populations do severe damage, tolerate adults to reap beneficial effects of larvae.

In those areas:

To kill adults, knock them from plants into pail or a large dish of soapy water (wear gloves to avoid contact with crushed beetles, which causes skin burns).

For severe infestations, spray pyrethrins.

Blister Beetle