Brie Williams
Fall Armyworms Are Invading The Southeast—Here's How To Keep Them From Destroying Your Lawn
14.08.2024 - 02:34 / southernliving.com / Arricca Elin SanSone
Fall armyworms (Spodotera frugiperda) are not a welcome visitor in the Southeast. They often appear in large numbers inlate summer to early fall and make the ground appear as if it’s moving as they devour every bit of vegetation in their paths. “They will march across your lawn, just like an army,” says Clint Waltz, PhD, turfgrass extension specialist at theUniversity of Georgia. “The adult moths are not a turf issue, but they lay eggs which become voracious caterpillars that can decimate a lawn and heavily damage certain types of turfgrasses.”
- Clint Waltz, PhD, is a turfgrass extension specialist at the University of Georgia.
Fall armyworms cannot survive winters in most of the Southeast, says Waltz. Instead, the moths hitch a ride every year on storms coming up frombalmy tropical regions, including Central and South America, southern Florida, and southern Texas. In some years, their numbers are worse than others.
Knowing what fall armyworms look like and how to treat them is your best defense against these destructive pests. Although they attack a variety of crops and grasses, their favorites arebermudagrass and tall fescue. While bermudagrass usually can recover from an attack, surviving a fall armyworm invasion is iffy for tall fescue. “It’s particularly risky for tall fescue in years when the turf is already suffering from heat and drought stress,” says Waltz.
Identifying Fall ArmywormsAdult moths are ash-gray and about 1 ½-inches wide. The front wings are smaller and gray and brown, while the back wings are larger and white with a brown edge. The moths are active at night and may be seen near porch lights. Once the female moth lays eggs, the masses hatch in a few days, depending on temperature.
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