How to Kill Armyworms in Lawn

How to detect armyworms in your lawn and kill the army worms in your Bermuda lawn.
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Doc walks you through armyworm detection and army worm pesticides / treatments.

When a homeowner discovers an army of caterpillars in their lawn, devouring the Bermuda grass, they need to take action. Armyworm caterpillars are incredibly voracious as they feed on Bermuda grass pastures and lawns in August and September.

The first signs are brown patches of Bermuda which rapidly grow bigger. The caterpillars feed at night, so the damage is not explainable at first. Your first sign of a fall armyworm infestation might be several birds clustered on a turf area. Although birds eat the caterpillars, they are no match for hundreds of them in one lawn.

As their numbers grow, entire lawns and fields can be eaten to the ground. The caterpillar is approximately 1 1/2 inch long, with white stripes down its body. There are usually two angled stripes on its head – joined to a longer stripe, the marking looks like a long “Y”.

If you have had army worms before, there is an easy early detection system: a gallon can with both ends removed and a bucket of soapy water. By plunging the can firmly into the turf and filling it with soapy water, caterpillars in hiding will quickly float to the surface. If more than five are found in the water, it’s time to treat.