Army worms can quickly wreak havoc on a healthy, green lawn. These pests, which are caterpillars of certain moth species, feed voraciously on grass, leaving brown patches and thinning your turf. If you’ve noticed signs of army worms in your yard, acting fast is essential to save your lawn. Here’s what you need to know and how to deal with them effectively.
Army worms are the larvae of moths and get their name from their behavior of moving in large groups—like an army—across lawns, gardens, and crops. They are most active during late summer and early fall when warm, humid conditions are ideal for their growth.
Knowing the signs early can save your lawn from severe damage. Look for:
Irregular brown patches or dead spots on your grass.
Grass blades chewed off near the ground.
Visible caterpillars on the lawn, especially in the morning or evening.
Birds or other wildlife feeding heavily on your lawn—they are natural predators of army worms.
Before taking action, confirm that army worms are the problem. Part them from other pests by noting their size, color, and behavior. Army worms are typically green, brown, or black with stripes along their bodies.
For smaller infestations, handpicking can work. Wear gloves and remove the worms in the morning or evening when they are most active. Dispose of them in soapy water to prevent them from returning.
Encourage natural predators in your lawn:
Birds like starlings and sparrows.
Beneficial insects such as parasitic wasps.
A birdbath or nesting area can attract these natural defenders to help control the army worm population.
Watering your lawn in the morning can help spot worms more easily.
Avoid mowing when worms are highly active; mowing may spread them further.
For severe infestations, chemical control may be required. Look for products labeled for army worm control, such as:
Bacillus thuringiensis (Bt) – a natural, environmentally friendly option.
Synthetic insecticides – for larger or persistent infestations.
Follow the label instructions carefully to avoid damaging your lawn or harming beneficial insects.
Keep your lawn healthy with regular watering, fertilization, and mowing. Healthy turf is more resistant to pests.
Remove thatch and debris where worms can hide.
Rotate pest control methods to prevent army worms from developing resistance.
Army worms can be frustrating, but with quick action and a combination of natural and chemical methods, you can save your lawn. Early detection, proper lawn care, and targeted treatments are the key to keeping your grass lush and green.
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