08/28/2026
Is your Houston lawn suddenly turning brown in patches this time of year? π Before you blame the heat, check for fall armyworms.
Fall armyworms are the caterpillar stage of a moth, and late summer into fall is when they march across Texas lawns. They feed in large numbers and move as a group, which is exactly why a green lawn can look scalped in just a couple of days. Texas A&M AgriLife notes that a heavy infestation of six or more per square foot can chew a lawn down in two to three days, and the worms do about 85% of their eating in the last few days before they pupate. Miss that window and the damage is done fast.
The good news: they're beatable if you catch them early. Here's what to watch for and do:
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Scout at dawn or dusk, when they feed β part the grass and look for green-to-brown striped caterpillars
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Watch for a sudden gathering of birds working your lawn β they're feasting on the worms
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Treat while the worms are still small (about Β½ inch); large ones eat the most and are harder to stop
A quick trick: mix a little dish soap with water in a bucket, pour it over a square foot of suspect turf and wait a few minutes, armyworms will surface. If you find them, act quickly. ABC's Houston lawn team can confirm the problem, treat it, and help your turf recover before fall.