Armyworms: Identification, Treatment & Prevention
Armyworms are the larvae of moths found in many regions around the world. They move in large groups — or "armies" — and can cause significant damage to crops.
What Are Armyworms?
Armyworms are the larvae of moths and can be found in many different regions around the world. They earned their name because they travel and feed in large groups, or "armies," devastating crops across wide areas in a short period of time.
How to Identify Armyworms
Size & Color
Look for small green or brown worm-like insects that are approximately 1 to 1.5 inches long.
Physical Markings
They have a dark line running down their back and may have small tufts of hair along their body.
Plant Damage Signs
You may notice holes or chewed areas in the leaves of your plants — a telltale sign of armyworm activity.
Treatment Methods
To treat armyworms, you can use a variety of methods depending on the severity of the infestation.
Handpicking
Handpick the worms from your plants and dispose of them to immediately reduce the population.
Biological Control
Use Bacillus thuringiensis (Bt), a naturally occurring bacteria that is toxic to armyworms but safe for other organisms.
Insecticides
Apply insecticides that are specifically labeled for use against armyworms for effective chemical control.
Recovering from an Infestation
Recovering from an armyworm infestation may take some time, as plants need a while to fully recover from the damage. Keep monitoring your plants for further infestation and take appropriate action if worms reappear.
Prevention Strategies
Crop Rotation
Rotate your crops seasonally to disrupt the armyworm lifecycle and reduce the likelihood of recurring infestations.
Trap Crops
Plant trap crops to lure armyworms away from your main crops, making them easier to manage and control.
Good Farm Management
Maintain good farm management practices — including regular monitoring and sanitation — to help prevent future infestations.
Stay Vigilant Against Armyworms
Early identification and prompt treatment are key to protecting your crops. Monitor your plants regularly and act quickly at the first sign of armyworm activity.
