As reports of fall armyworms continue to emerge across the Southeast, an entomologist from the University of Tennessee Institute of Agriculture urges residents to monitor their properties for this migratory pest.
“Fall armyworms migrate north from Texas, traversing Tennessee and neighboring states annually,” explains Midhula Gireesh, assistant professor and UT Extension entomologist. “Given the increasing number of reports, landowners should regularly scout their properties for signs of infestations, particularly over the coming weeks.”
Gireesh notes that one of the first signs of an infestation is grass that appears “frosted,” a result of newly hatched armyworms feeding on the underside of the leaves. Other indicators include dead plants, brown patches in lawns, and large groups of birds gathering to feast on the worms.
“It’s crucial to scout every few days to detect infestations early,” Gireesh advises. “If armyworms are found, it’s essential to initiate control measures immediately.”
Chemical treatment options, available at farm supply and lawn and garden stores, can effectively eradicate most infestations. However, these treatments are not preventative and should only be used if worms are already present. Many insecticides can also endanger beneficial insects and other organisms, so Gireesh encourages applicators to always follow label instructions and contact their local Extension office with any questions before applying treatments.
The armyworm is the caterpillar of the fall armyworm moth, primarily feeding on grass, fresh sod, and hay fields, with rare instances of impacting summer and fall crops. An armyworm’s lifespan is about 30 days, with late-stage caterpillars consuming the most food.
Gireesh reassures residents to remain calm despite ongoing reports. “The severe infestations we experienced in 2021 were an unusual occurrence, and it’s important to remember that this is a yearly migration. While warm-season grasses like bermudagrass can be vulnerable to significant damage from fall armyworms, such feeding typically does not lead to the death of established lawns. Many grass varieties in our region have rhizomes, or belowground stems, which enhance their recovery from damage. Early identification is key for effective control of armyworms, so stay vigilant in scouting and don’t hesitate to seek help if needed.”
To learn more about armyworms and the available treatment options, please contact your local county Extension office.
Tate Cronin serves as a Marketing and Communications Specialist at the University of Tennessee Institute of Agriculture (UTIA). The Institute encompasses the Herbert College of Agriculture, the UT College of Veterinary Medicine, UT AgResearch, and UT Extension. Through its land-grant mission of teaching, research, and outreach, UTIA impacts lives and delivers Real. Life. Solutions. to the people of Tennessee and beyond. [utia.tennessee.edu](https://utia.tennessee.edu/)
