It’s that magical time in North Florida — your Southern Charm Crape Myrtles have finally leafed out with gorgeous, lush, bright-green new growth. One morning you step outside, coffee in hand, and smile at how perfect they look.
The next morning? It looks like a caterpillar buffet exploded overnight. Leaves are skeletonized, ragged edges everywhere, and you’re left wondering what on earth just happened.
Don’t panic. This is super common every May, and here’s the good news: caterpillars almost never permanently damage a healthy crape myrtle. The tree will push out a fresh flush of leaves and still bloom like crazy all summer. It’s just heartbreaking to watch your perfect new foliage disappear in 48 hours!
There are over 180,000 known species of Lapidoptera that munch of leaves. Yours might be different than the ones described here.
The Usual Suspects: 3 Common Caterpillars That Love Your Crape Myrtles
In the South (especially North Florida), these three troublemakers show up like clockwork every spring:
1. Io Moth Caterpillar These catarpillars are jerks. Bright green with bright red and white stripes and clusters of stinging spines. They line up along the edges of leaves and eat in neat little rows (super creepy to watch). Touch one and you’ll know why they’re called “stinging” — those spines can leave a painful welt. They’re generalists but absolutely love tender new crape myrtle growth.
2. Tussock Moth Caterpillar These catarpillars are bigger jerks. Fuzzy, with distinctive tufts of hair (the “toothbrush” look) in black, white, and orange. These are the hairy ones you see everywhere in Florida right now. The hairs can irritate skin and even cause itchy eyes if they blow around. They’re voracious eaters and can strip a young tree fast.
3. Saddleback Caterpillar Biggest. Jerk. Ever. This one looks like it’s wearing a little saddle — brown with a bright green center and venomous spines around the edges. They’re smaller but pack a serious sting. They feed on a wide variety of plants, including crape myrtles, and are another classic spring culprit in the Southeast.
Do You Even Need to Treat Them?
Short answer: Usually no.
These guys are seasonal. They show up in big waves when the new growth is most tender, feast for a week or two, then disappear just as fast as they arrived. Birds, wasps, and beneficial insects usually clean up the rest. Your crape myrtle will rebound beautifully with no long-term harm. But man, the stings are seriously ouchy.
When It’s Time to Fight Back (The 1 Million to 1 Rule)
If the caterpillars have outnumbered you so badly that your tree looks like it’s waving a white flag… it’s time for Thuricide.
Thuricide is a naturally occurring bacteria called Bacillus thuringiensis subsp. kurstaki (Bt for short). It’s completely safe for:
- Honey bees
- Earthworms
- Ladybugs
- Birds
- You and your pets
It only affects caterpillars (and a few other leaf-munching larvae). They eat it, stop feeding within hours, and die in a couple of days. Super targeted and organic-friendly.
Pro tip: Apply at the first sign of munching, following the label instructions. Evening sprays work best so the product stays moist longer on the leaves.
Final Thought
Your crape myrtles are tough — they’ve survived worse than a spring caterpillar party. A little patience (or a quick bottle of Thuricide) is all it takes to get them back on track for those spectacular summer blooms you planted them for.
Have you spotted any of these fuzzy (or spiny) troublemakers on your trees this month? (these are mean little jerks, did I mention that??) Let us know! Misery love company lol!
Next up in the “Ugh, What a Pest!” series: Aphids, crape myrtle bark scale, and the best organic vs. chemical options for every common problem. I'll get to them when I start to see 'em.
Until then… happy (mostly) pest-free gardening! 🌳🐛
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