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Blister Beetle Facts & Information

Protect your home or business from blister beetles by learning techniques for identification and control.

Blister Beetle Illustration
1 to 2.5 cm
Ash gray to bright yellow
Black stripes


How do I get rid of blister beetles?

What Orkin Does

Orkin Pros are trained to help manage beetles of all kinds. Since every home or property is different, the Orkin Pro will design a unique beetle treatment program for your situation.

Keeping these beetles out of your home is an ongoing process, not a one-time treatment. Orkin’s exclusive A.I.M. solution is a continuing cycle of three critical steps—Assess, Implement and Monitor.

Orkin can provide the right solution to keep beetles in their place...out of your home.

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Frequently Asked Questions

Behavior, Diet & Habits

Understanding Blister Beetles


There are several species of blister beetles in the U.S.

  • Size: Blister beetles are softbodied beetles that range in size from 1 to 2.5 cm in length.

  • Color: Adults range in color from an ash gray to bright yellow with black stripes.

They usually are seen during the day on flowers and also are attracted to lights at night.


Blister beetles belong to a group of insects with a very interesting and sordid past with people. They get their name from a caustic chemical they produce called cantharidin. When crushed, the beetle can literally bleed the chemical from its joints, and skin contact with it can result in blisters. Even though cantharidin is caustic, it has medical properties that people have long exploited in the form of Spanish fly. People would consume a concoction of dried and crushed blister beetles for ailments such as gout and arthritis, as well as using it as the aphrodisiac Spanish fly. Unfortunately, cantharidin can be fairly toxic and it is no longer widely used in medicine.


Blister beetles are not an indoor infesting pest. They tend to be more of an agricultural/livestock pest. Many species feed on plants which include ornamental and vegetable crops. Horses and livestock also may be affected. Blister beetles, feeding in a hay field, may accidentally be ground up when the hay is harvested. The cantharidin impregnates the hay and can be consumed by the animals, potentially resulting in their death.


Eggs are laid by the female in protected areas like under stones. The initial larvae are highly mobile and usually seek out insects such as bees as they feeds on flowers. The larvae ride back to the nest where they prey on the inhabitants of the nest. The larvae eventually become pupae and then transform into adults.

More Information

Blister Beetle Poisoning

Blister Beetle Larvae

Blister Beetle Bites

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