If you’ve noticed patches of your lawn turning brown almost overnight, you might not be dealing with drought stress or fungus. This time of year in Central and South Brevard County, the most likely culprit is the fall armyworm, and they can do serious damage in a matter of days if they go unnoticed.
What Are Fall Armyworms?
Fall armyworms aren’t worms at all. They’re the caterpillar stage of a moth, and they get their name from the way they move across a lawn in large numbers, “marching” from one area to the next as they eat through the grass. In Florida, they’re most active from late summer into fall, which makes September and October peak months for an outbreak.
A single female moth can lay hundreds of eggs, and once those eggs hatch, the young caterpillars start feeding almost immediately. Because they feed in groups, a healthy-looking lawn can show visible thinning or bare patches within 24 to 48 hours once a population takes hold.
How to Spot Them Early
Fall armyworms tend to feed at dawn, dusk, or overnight, so you may not see them crawling around during the middle of the day. Here’s what to look for instead:
- Irregular brown or thin patches, especially ones that seem to spread quickly
- Birds gathering on your lawn more than usual, since they’re often feeding on the caterpillars
- Grass blades that look ragged or chewed, rather than uniformly brown like you’d see with drought stress
- Small green or brown caterpillars with a distinctive inverted “Y” marking on their head, visible if you part the grass and look closely
If you’re not sure what you’re looking at, a quick soap flush test can help. Mix a couple tablespoons of dish soap into a gallon of water and pour it over a suspicious patch of lawn. If armyworms are present, they’ll usually surface within a few minutes.
Why Acting Quickly Matters
Fall armyworms move fast, both literally and in terms of the damage they cause. A lawn that looks fine on Monday can have significant bare spots by the weekend. And because they travel in groups, an untreated infestation in one part of your yard can spread to the rest of your lawn, or even to a neighbor’s, in short order.
The good news is that armyworm damage doesn’t usually kill the grass at the root. With prompt treatment and proper care afterward, most lawns bounce back. Waiting too long, though, can mean more extensive reseeding or sodding to fully recover.
What You Can Do
A few habits can help you catch a problem before it spreads:
- Walk your lawn regularly during September and October, especially after a few dry days that follow rain, which tends to trigger heavier moth activity.
- Keep an eye on neighboring yards. If you notice thinning grass a few properties over, it’s worth checking your own lawn more closely in the coming days.
- Avoid overwatering, since consistently moist turf can make conditions more favorable for egg laying.
- Call in professional help at the first sign of trouble. DIY treatments can knock back a visible infestation, but a licensed lawn care team can identify the extent of the problem and apply treatment that protects the rest of your lawn before it spreads.
Let Flowers Turf & Pest Handle It
Fall armyworm season sneaks up on a lot of Brevard County homeowners every year, and by the time the damage is obvious, the caterpillars have often already moved on to the next section of lawn. Our team knows the signs to look for and the right timing for treatment, so you don’t have to guess.
If you’ve spotted thinning patches or just want a professional set of eyes on your lawn before the season peaks, give us a call at 321-254-1929 or reach out through our website. We’ll help you keep your lawn healthy through the rest of fall.