The fall armyworm is a native species that can’t tolerate cold very well. They only overwinter in South Florida and the southernmost regions of Texas. Since they can not tolerate cold, we typically have about four to five generations per year. They begin to show up in late May to early June, but the worst damage typically occurs in August. They migrate north yearly, but their populations are lower for some years, and their damage is minimal. Damage seems worse following droughts.
Question of the Week – Armyworms
28.08.2024 - 11:45 / hgic.clemson.edu / Justin Ballew
What is causing this lawn to turn brown even though it has received over 5 inches of rain so far this month?
This lawn is infested with fall armyworms (Spodotera frugiperda). In just a few days, the armyworms ate all the leaf blades, leaving little more than just stems. While multiple species of warm-season grasses are affected, bermudagrass started showing damage first and seems to be the most significantly affected. Pastures and hayfields can be particularly devastated. Fall armyworms are seasonal pests that move in from areas further south, where they can survive the winter. They usually show up in SC in the late summer and complete their life cycle in about a month before disappearing again. Read more about armyworms and find management information here.
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