Armyworm caterpillars are a less common culprit.
However, these cool-season grass lovers can cause widespread lawn damage when left unchecked.
We spoke with an entomologist to learn how to get rid of armyworms so your lawn stays looking lush.
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What Are Armyworms?
Armyworms are larvae (caterpillars) of moths that can be grass and crop pests.
They also feed on some edible garden crops, ornamental plants, and weeds.
Want more gardening tips?
Tip
Regularly inspect your lawn or other plants prone to armyworm damage.
Early detection and prompt action minimize damage, making it easier to get rid of infestations.
Setting up moth traps can also help prevent armyworm larvae from being laid.
She suggests mixing 1 oz of quality liquid dish soap per gallon of water.
Use a couple of gallons to pour over one square yard of lawn, she says.
Below are four strategies for getting rid of armyworms.
Weed Your Landscape
Keep your lawn, flower beds, and vegetable plot weed-free.
Weeds are potential harborages for eggs and young armyworm larvae, Dr. Ellis says.
It’s easy toapply beneficial nematodesusing a watering can or a sprayer at rates advised by manufacturers.
Even then, it can be challenging because of insecticide resistance development in armyworm populations.
Dr. Ellis advises to only use methods recommended by your local extension service or a pest control professional.
Armyworms aren’t nocturnal, but they tend to be more active at night and on overcast days.
Vinegar isn’t effective for killing armyworms.
According to Dr. Ellis, using vinegar will likely only result in damaged plants rather than killing the armyworms.
She recommends sticking with methods approved by local extension services or pest control professionals.
Iowa State University Extension and Outreach.
