Blister Beetle

Blister Beetle

A few of many beetles in the blister beetle family. The beetle is part of the Meloidae family, they are called blister beetles for a good reason.

Today, I stumbled onto another blister beetle.  I heard parts of Wisconsin were experiencing visits from these nasty little critters.


A Well Deserved Name

You more than likely guessed how they got their name by now?,

The beetles is so-called because their juices cause blistering of the human skin, and when dried and powdered they were formerly much used by physicians for blistering. The beetle releases a secretion as a defense mechanism, the secretion causes blisters on animals and humans. There are about 7,500 species that are known worldwide and each looks differently.


What Do They Look Like?

They are soft-bodied beetles with the head prominent and attached to the thorax by a very distinct neck. The elytra are flexible and rounded posteriorly so that usually they do not cover the tip of the abdomen, while in some forms the wing-covers are quite short and the wings are lacking.

Lifecycle of blister beetle


Our common species are about half an inch long, dull gray or blackish, often marked with yellow stripes, while others are of a brilliant metallic bronze, green, or blue. The adults often appear in immense swarms and ruin garden crops

The female beetle deposits from four to five hundred of her yellowish eggs in irregular masses in loose ground, and in about ten days there hatch from these eggs some ” very active, long-legged larvae, with huge heads and strong jaws, which run about everywhere seeking the eggs of locusts and grasshoppers. Which they devour in large numbers, and are quite beneficial in spite of the bad habits which they later acquire as adults.


How Does a Human Come in Contact?

Striped beetle called a blister beetle.  Causes blisters on skin when you come in contact them them.
Striped variety on wildflower.

When heading through fields some people come into contact with them and have no idea why they are blistered later in the day. 

It can, and does happen that the insects feel threatened. Thus leaving you blistered a few hours later.



Livestock Word of Caution

As a word of caution, sometimes, hay, and crops can be extremely toxic to horses and cattle that have an infestation with this or any additional blister beetle family member. There are cases in the Midwest of harvested feed crops, that crushed beetles have released the agent into the food source.

The toxin has caused blistering on horse and cattle mouths and inside the intestinal tract. An extreme number of beetles can be fatal to livestock.

Interesting little bugger, huh?.  One that isn’t always a garden pest.  But, certainly can be found in vegetable and flower gardens too.

Never know what critters I’ll run into on my walks with wildlife and gardening.

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