Three different kinds of caterpillars are invading Michigan this fall that you should keep your eyes open for.  Here's what you need to know about these venomous caterpillars.

Unsurprisingly, we have a couple of venomous spiders to watch out for in Michigan.  But...Caterpillars?  The word poisonous is thrown around a lot when it comes to spiders, snakes, and even caterpillars.  Technically, they're venomous, not poisonous.  And when we say venomous, we don't mean caterpillars can kill humans.  It's usually more of an extreme irritation.  However, they are very toxic to your pets.  Do not let your dogs or cats near the little buggers.

 

3 Venomous Caterpillars In Michigan

American Dagger Caterpillar

The American Dagger Caterpillar is mostly yellow and white with a few black hairs.  Back in 2019 Click on Detroit reported on the dangers these little critters pose to humans,

Symptoms include the following: stinging sensation followed by a burning, itching sensation on the skin which can develop into a rash.

 

These caterpillars grow to about 2 inches long and can be found on the ground and in many different types of trees in Michigan between July and October.

American Dagger caterpillars in Michigan are poisonous
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Hickory Tussock Moth Caterpillar

This caterpillar is most common along the East Coast states from Maine down to the Carolinas.  The Hickory Tussock Moth caterpillars peak from July to September each year, according to MSU.  These little furry guys are relatively harmless. You might get a rash if you get stung by them.  However, some people are allergic to them.

Hickory Tussock Moth caterpillar in Michigan are poisonous
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Spongy Moth Caterpillar

These invasive caterpillars can cause a rash and a stinging sensation if they come into contact with your skin, according to CottageLife.com.

Spongy Moth Caterpillars in Michigan are poisonous
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Michigan's 5 Most Common Winter Bugs: How to Keep Them Out

Michigan's Falls may be filled with color, but while we're looking up and admiring the trees, bugs are slipping in through tiny little crevices in your home that are essentially little welcome mats for the state's top 5 winter pests. When you're battling bugs, you go to someone who's in the trenches, so I asked Bob Yoakman, Mason, Michigan's Bug Man, for tips on how to keep Michigan's 5 Most Common Winter Bugs at bay.

Gallery Credit: Scott Clow

 

 

America's 50 Most Bed Bug Infested Cities in 2025

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Gallery Credit: Scott Clow

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