Two stinging caterpillars are making headlines across the South this spring and if you have oak trees in your yard, there is a good chance one of them is already overhead.
- Tussock moth caterpillars are swarming Central Florida, dropping from oaks onto cars, porches, and people.
- In Louisiana and the Gulf Coast, a warm winter has entomologists watching for a heavier-than-normal buck moth caterpillar season.
Both species can deliver a painful, venom-loaded sting without any warning.
These two types of caterpillars are making headlines this year, but the South is home to 5 stinging caterpillar species that become active every spring. They are hard to avoid, but tree trimming and yard maintenance can help keep them in check.
Here is what every Southern homeowner needs to know.
| Key Takeaways |
|---|
| • The puss caterpillar is one of the most venomous caterpillars in the U.S. Its fluffy appearance is exactly the trap. • Most stinging caterpillars live in tree canopies and fall on people without warning. • If stung, press tape over the area to remove spines, apply ice, then use a baking soda paste. Never rub. • Spring is peak season. Check outdoor furniture and wear long sleeves before working under trees. |
Why stinging caterpillars are such a big problem this spring
Stinging caterpillars emerge every spring across the South, but 2026 is shaping up to be a worse-than-usual year for two species in particular.
In Central Florida, tussock moth caterpillars are swarming in large numbers, dropping from oak trees onto outdoor furniture, vehicles, and people. One Brevard County woman was hospitalized after contact with one, according to FOX 35 Orlando. Research on the white-marked tussock moth suggests that warmer winters mean earlier, more abundant hatches, and 2026 is delivering exactly that.
In Louisiana and the Gulf Coast, a mild winter produced unusually high numbers of adult buck moths. Tulane University professor Sarah Michaels told nola.com the high moth count over winter could signal a big caterpillar season ahead. Buck moth caterpillars are already active in New Orleans and Baton Rouge neighborhoods lined with live oaks, according to the Audubon Insectarium.
Both outbreaks share a common thread: Warmer winters and longer springs create better conditions for caterpillar populations to build earlier and in greater numbers.
5 stinging caterpillars to know
If you are trying to identify a caterpillar you just found, start with the table below.
| Caterpillars | What it looks like | Risk level |
| Tussock moth caterpillar | Colorful hair tufts (white/yellow/black), long thin projections front and rear | Moderate |
| Buck moth caterpillar | Up to 2.5 inches, black with white dots, branching spines or whitish body, also with white spots, reddish head | High |
| Puss caterpillar | Around 1 inch, oval, soft gray or brown hair hiding stiff spines | High |
| Saddleback caterpillar | Around 1 inch, green saddle with brown oval, spiny ends | High |
| Io moth caterpillar | Chunky, bright green, red and white side stripes, spiny tufts | Moderate |
“Caterpillars that have tufts of hair on their body are generally sending out a message that they are venomous or irritating in some way,” says Molly Keck, board certified entomologist and senior program specialist in Integrated Pest Management at Texas A&M AgriLife Extension Service. “This is an adaptation called aposematism.”
1. Tussock moth caterpillar
- Found on: Oaks
- Where: Swarming Central Florida in spring, found across eastern North America and the Gulf states
Tussock moth caterpillars have colorful tufts of white, yellow, or black hair with long, stiff projections (called pencil hairs) extending from the front and rear, almost like antennae. Their hairs cause skin irritation, redness, and rash. They regularly fall from oak trees and land on people, cars, and porches.
Journal of Integrated Pest Management research suggests tussock moths tolerate warmer temperatures well, and shorter winters could mean earlier and more abundant hatches. ClickOrlando reported on the current outbreak in late March, with UF entomologist Adam Dale urging residents to avoid contact.
Cocoon removal: Their cocoons contain the same stinging hairs. Remove cocoons with tweezers, not bare hands. Caterpillars can be swept into a bucket of soapy water.
2. Buck moth caterpillar
- Found on: Oaks, willows, especially live oak
- Where: Louisiana, Mississippi, Gulf Coast
Buck moth caterpillars grow up to 2.5 inches, and are typically black with tiny white dots and rows of multi-branched spines. A lighter color form also exists. The sting is intense, and pain can last 24 hours or more, sometimes radiating to nearby lymph nodes.
Most abundant from March through May, they are a spring fixture in New Orleans, Baton Rouge, and surrounding Gulf Coast communities with live oak canopy. This year’s warm winter produced high numbers of adult moths. Entomologists say this could mean a heavier-than-normal caterpillar season this spring.
3. Puss caterpillar
- Found on: Oaks, elms, citrus trees, various shrubs
- Where: From New Jersey south to Florida and west to Arkansas and Texas
The puss caterpillar is one of the most venomous caterpillars in the United States. About an inch long, completely covered in soft gray or brown hair, it looks harmless. Kids especially want to touch it. Beneath the hair are stiff spines connected to poison glands. They break off on contact and release venom, causing immediate and severe pain.
How badly a sting affects you depends on the person.
“Everyone is going to react differently to venoms, whether it’s from stinging caterpillars, fire ants, bees, or others,” says Wizzie Brown, senior extension program specialist in Integrated Pest Management at Texas A&M AgriLife Extension Service.
A Texas poison center study recorded 3,484 puss caterpillar stings over 17 years, and 91% happened in the person’s own yard.
4. Saddleback caterpillar
- Found on: Maples, hibiscus, crape myrtles, oaks
- Where: From Massachusetts south to Florida and west to Texas and Missouri
The saddleback caterpillar has a brown body with a bright green band and a brown oval center, with spiny protrusions at both ends. Those bold colors are a warning. The spine clusters are loaded with venom, and contact causes intense burning. Some people experience severe reactions needing medical attention.
5. Io moth caterpillar
- Found on: Oaks, willows, deciduous trees
- Where: Eastern United States from Maine to the Florida Keys, west to Texas. Most active in Florida and the Gulf states (late spring through summer)
The io moth caterpillar is bright green with red and white side stripes and clusters of branching spines. Contact causes a nettle-like burning sensation with swelling and redness. Warmer temperatures support multiple generations per year.
Read more: Common Spring Lawn Pests: How to Identify and Control Them
What to do if you get stung
Most caterpillar stings can be treated at home. For puss caterpillars specifically, research shows nearly 9 out of 10 puss caterpillar stings are managed at home. Here is how to treat a caterpillar sting.
- Press clear tape over the area, then pull it off. Repeat with fresh tape until spines are out. Do not rub.
- Wash with soap and water.
- Apply ice to reduce swelling.
- Apply a baking soda paste (baking soda + water) to soothe irritation.
- Take an antihistamine and apply hydrocortisone cream to help with itching and inflammation.
- Call Poison Control at 1-800-222-1222 if you are unsure how serious the reaction is (available 24/7).
Seek medical attention if you have a history of allergies, asthma, or hay fever, or if you develop swelling beyond the sting site, difficulty breathing, or nausea.
Pro tip: If you were stung on your arm or leg, the rash pattern sometimes mirrors the shape of the caterpillar. That grid or stripe pattern is a telltale sign of a puss caterpillar sting, specifically.
Sting response by caterpillar type
Use this table to gauge how serious your reaction might be based on the type of caterpillar.
| Caterpillar | Pain level | Common symptoms | See a doctor? |
|---|---|---|---|
| Puss caterpilla | Severe, immediate | Burning, nausea, headache, possible fever | Yes, if symptoms spread or in a high-risk group. Seek emergency care if seizures occur. |
| Saddleback caterpillar | High, intense burning | Burning, irritation, redness | Yes, if the reaction is severe |
| Buck moth caterpillar | High, intense | Burning, swelling, pain radiating to lymph nodes | Yes, if severe or pain persists |
| Io moth caterpillar | Moderate, nettle-like | Burning, swelling, redness | Yes, if symptoms worsen or spread |
| Tussock moth caterpillar | Mild to moderate | Redness, rash, itching | Rarely. Yes, if rash spreads |
Sources: UF/IFAS,LSU AgCenter,National Capital Poison Center, Texas Poison Center Network
How to protect yourself and your yard
Look up before you work. If you are pruning, raking, or gardening near oaks or elms, scan the branches above you first. Caterpillars drop from canopies, and mower vibrations can knock them loose.
When working near trees, protect yourself. “I would recommend that they wear protective gear like long sleeves and pants, a wide-brimmed hat, and gloves to protect themselves while working in the yard,” Brown says. “This can also help to protect them from other arthropods such as mosquitoes, wasps, spiders, scorpions, and others.”
Kid safety: The fluffier a caterpillar looks, the more dangerous it probably is. Teach children never to pick up or pet fuzzy caterpillars. The puss caterpillar looks like soft fur but delivers one of the most painful stings.
Check outdoor furniture before sitting, especially under trees.
For severe infestations, Bacillus thuringiensis (Bt) is an organic insecticide that targets caterpillars without harming beneficial insects. It must be ingested, so apply to foliage while caterpillars are still feeding.
Synthetic pyrethroids labeled for caterpillars also work well, but thorough foliar coverage is key.
“A good application covering the plant and leaf material so that the caterpillars encounter the insecticide and receive a lethal dose is important,” Keck says.
For large or mature trees, contact a certified arborist or pest control professional for treatment.
Pro tip: Heavy rain can knock stinging caterpillars out of trees onto furniture, cars, and the ground below. After a storm, check any outdoor surfaces under oak trees before sitting or touching them.
Read more:
How to Get Rid of Caterpillars in Your Yard
Best Organic Pest Control Options for Your Lawn
FAQs
For most caterpillars, burning and redness subside within a few hours. Puss caterpillar stings are the exception: Pain can last 12 hours or more, and systemic symptoms like headache and nausea can persist up to 24 hours. If pain or swelling is still getting worse after a few hours, get medical attention.
Yes. Pets that paw at or mouth a stinging caterpillar can get spines in their paws, lips, or tongue. Use tape to remove visible spines, and call your vet if swelling increases or your pet stops eating. Dogs that play around the base of oak trees in spring are especially at risk.
Yes. The venomous spines stay active after a caterpillar has died or transformed. Cocoons, shed skins, and dried caterpillars can still cause a rash. Use tweezers or disposable gloves when removing any of these from furniture or play equipment.
Stay ahead of stinging caterpillar season
Venomous caterpillars in the Southeast are a fact of spring, but not a reason to skip yard work. Overgrown trees and untended shrubs give stinging caterpillars more places to hide. Check the canopy before you start, keep kids and pets away from anything fuzzy, and have tape and ice ready just in case.
Lawn Love connects you with local lawn care professionals who can help with tree trimming, yard cleanup, and maintenance to help keep these pests away. Get a free instant quote and pick a time that works for you.
Read more:
- Signs of Lawn Pest Damage vs. Disease vs. Drought Stress
- How to Get Rid of Cutworms
- How to Get Rid of Chinch Bugs
Main Image: An io moth caterpillar (Automeris io) stinging a finger. Photo Credit: Hamilton / Adobe Stock, created using Canva Pro
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