The Turf Zone Podcast
Alabama Turfgrass Association – Are you Getting Residual Control of Fall Armyworms from your Insecticide Applications?
The fall armyworm (Spodoptera frugiperda), is a significant pest of all turf and pasture grasses throughout the eastern United States. There are several species of armyworms in our area, but this species develops faster (21 days from egg to adult) than the others and has 4–5 generations a year in Alabama. Fall armyworms have a white wishbone on the head and four distinct dots on the end abdominal segment. They do not overwinter in Alabama; however, moths arrive every spring from southern TX and FL and have continuous generations through fall. Outbreaks of fall armyworms are most common in mid to late summer. By then, multiple generations are overlapping leading to large populations that cause significant damage. Fall armyworms feed in large numbers and, in urban lawns, these masses of larvae can easily scalp a lawn in a day. Despite their small size, they can move between lawns in a typical subdivision, between fields, or from rough to fairway in a short time.