09/10/2025
It’s been just over a month since we last posted about Fall Armyworms. I just spotted some on a walk this afternoon. Currently, most caterpillars are still small. Now is the ideal time to scout for and control the fall armyworm larvae, before caterpillars get larger and do even greater damage.
As a reminder, Fall Armyworm caterpillars are usually found in large numbers when they are present, and the caterpillars can be identified by:
• Young caterpillars are light green in color
• Older caterpillars are up to 1.5 inches long, tan to olive-green in color, and have stripes extending the length of both sides of the body.
• A light-colored, inverted Y-shaped marking on the front of the head
• Four black tubercles on the back of each abdominal segment
Another option to help test for Fall Armyworms, if you suspect them in your lawn, is to mix one tablespoon of liquid dish soap in one gallon of water. Pour this soapy water solution onto a four-foot by four-foot area of turfgrass near the damage. If fall armyworms are present, they will crawl to the surface and be easier to identify. It’s always a good idea to test several areas to be sure. Fall Armworms are most active in the early morning and evening hours. As a result, Fall Armyworms may be easier to spot in your lawn during these times of day.
Another option to help test for Fall Armyworms if you suspect them in your lawn is to mix one tablespoon of liquid dish soap in one gallon of water. Pour this soapy water solution onto a four-foot by four-foot area of turfgrass near the damage. If fall armyworms are present, they will crawl to the surface and be easier to identify. It’s always a good idea to test several areas to be sure.