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These caterpillars can completely defoliate your lawn unless you stop them in their tracks.
Armyworms are the larvae of a moth that primarily eat grass blades, but will also eat some vegetables, like beans, cabbage, corn, onion, pepper, pea and radish. A large armyworm infestation can defoliate an entire lawn in a few days.
Armyworms aren't the only larvae you may find living in your lawn. Here's how to identify them:
Largely found in the South, especially on bermuda grass, armyworms can infest lawns and cause severe damage. Adult armyworm moths sometimes ride storm fronts into the North, though, so it's important to keep an eye out in any region. Look for small patches of brown grass with the edges of the blades chewed. Some blades may be completely eaten.
If you notice an increase in adult moths or spot a mass of furry-looking eggs, you may want to prepare for an infestation. Here's what to look out for and what to do.
Watch for Moths, Eggs, and Damage
Treat Early for Best Control
Unusual shifts in weather or variations in insect migration patterns can increase armyworm development while decreasing the amount of natural armyworm predators. The result? An armyworm infestation. If this happens in your yard, you can control armyworms with an insecticide.
If you find armyworms in your lawn, apply granular Ortho® Bugclear™ Insect Killer1 using a spreader or Ortho® Bugclear™ Insect Killer for Lawns & Landscapes Ready-to-Spray using your garden hose. Armyworms are surface feeders, so you should be able to spot them in the turf. Under small to moderate infestations, although the grass blades may be chewed, the crowns are not damaged by the feeding and can recover if the damaged area is kept well fed and watered. The most severe damage occurs during hot, dry weather, so don't delay armyworm treatment if you think they're attacking your grass.
How you help your lawn recover from an armyworm infestation depends on how big of an infestation you're dealing with and where you're located.
The key to stopping armyworms is keeping an eye out for their presence. Follow these tips and you'll be ready to fight back if armyworms try to invade your lawn.