Stinging Caterpillars in Florida: The Fuzzy Bugs You Shouldn't Touch

Not every caterpillar in your yard is harmless. Florida is home to several "stinging caterpillars" that carry tiny hollow hairs filled with venom. Brush against one and you'll feel it fast — burning, redness, and swelling that can last for hours or even days.

These caterpillars usually turn up on trees, shrubs, and garden plants from spring through fall. Kids and pets are most likely to run into them because they're curious about the fuzzy or spiky look. Knowing what to watch for helps your family enjoy the yard without an unpleasant surprise.

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Type

Stinging Caterpillars

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Active Season

Spring Through Fall

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Found On

Trees, Shrubs, Palms

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Danger Level

Painful, Rarely Serious

How Do Caterpillars "Sting" If They Don't Have Stingers?

Stinging caterpillars don't sting the way a bee or wasp does. Instead, their bodies are covered in stiff little hairs or spines called urticating hairs. These hairs break off easily and stick right into your skin when you brush against them. Many of these caterpillars also carry a mild venom in the hairs or spines, which is what causes the burning pain, redness, and swelling people feel after contact.

The good news is that most reactions look worse than they are and clear up within a day or two. Still, some people react more strongly than others, and it's smart to know which caterpillars in your yard can cause trouble.

Stinging Caterpillars You Might Find in Your Yard

Saddleback Caterpillar

Look For: A bright green "saddle blanket" patch on a brown body, about an inch long
Where: Maples, hibiscus, palms, and crapemyrtle
Reaction: Intense burning, swelling, and welts; one of the more painful stings

Puss Caterpillar

Look For: Soft-looking brown to gray fur with a small tail, about an inch long
Where: Citrus, oaks, and elm trees; two generations show up each year in Florida
Reaction: Severe pain despite the harmless, fuzzy appearance

Io Moth Caterpillar

Look For: Bright green body with red and white stripes, covered in spiny branches
Where: Hibiscus, elm, maple, wisteria, rose, and azalea plants
Reaction: Sudden burning and itching that fades over several hours

Hag Caterpillar

Look For: Brown body with curved, hairy arm-like spines of different lengths
Where: Oak, dogwood, and apple trees
Reaction: Burning, itching, and redness; severity varies person to person

Buck Moth Caterpillar

Look For: Dark, spiny caterpillar with white dots, growing over two inches long
Where: Oak and willow trees
Reaction: Sudden stinging and swelling that can linger for days

Spiny Oak-Slug Caterpillar

Look For: Small, stout body with clusters of spines along the sides and rear
Where: Oak, willow, and cherry trees
Reaction: Milder sting than most, but still causes burning and redness

When to get medical help: Most stings just need a cold compress and time. But if someone has trouble breathing, swelling spreads beyond the sting site, or a rash keeps getting worse, seek medical care right away. Some people are more sensitive to caterpillar venom than others.

Not Every Fuzzy Caterpillar Stings

It's easy to assume anything hairy is dangerous, but that's not always true. One local look-alike worth knowing is the tussock moth caterpillar, which is common on Tampa Bay trees and shrubs. We cover exactly what makes it different — and why you still shouldn't handle it — in our guide to tussock moth caterpillars in Florida homes.

Comparing the Sting

Caterpillar	What It Looks Like	Typical Reaction
Saddleback	Green "saddle" patch on a brown body	Intense burning and welts
Puss Caterpillar	Soft, furry, tan to brown	Severe pain on contact
Io Moth	Neon green with red and white stripes	Sudden burning, fades in hours
Hag Caterpillar	Brown with curved, arm-like spines	Burning and itching, varies by person
Buck Moth	Dark and spiny with white dots	Stinging and swelling for days
Spiny Oak-Slug	Small and stout with spine clusters	Milder burning and redness

Signs Stinging Caterpillars Are Around

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Chewed or ragged leaf edges on trees and shrubs

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Fuzzy or spiny caterpillars resting on leaves or bark

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A sudden burning sting after brushing against a plant

What to Do If You Get Stung

Remove the Hairs

Press tape onto the area and peel it off to lift out any broken spines still stuck in the skin.

Cool It Down

Apply a cold compress or ice pack to ease the burning and slow the swelling.

Watch for Reactions

Keep an eye on the area for a day or two, and get medical care if symptoms get worse instead of better.

Keeping Stinging Caterpillars Away From Your Family

Teach kids to look but not touch any fuzzy or spiky caterpillar outside
Trim back branches that hang low over patios, play areas, and walkways
Wear gloves and long sleeves when pruning trees and shrubs known to host caterpillars
Check outdoor furniture and toys before kids or pets use them
Have a professional inspect and treat trees with heavy caterpillar activity

InsectIQ has an entomologist on staff who can help identify which caterpillar is causing trouble in your yard and recommend the best way to deal with it.