Great, armyworms have arrived. As if the weeds and nutsedge aren’t enough hassle! They prefer to eat Bermuda, however, they will also eat fescue seedlings, once fall seeding completed. They will eat the whole lawn seedlings in 24 hours. What about the turf insect control you applied in June? Why doesn’t that kill them? We use imacloprid and bifenthrin at that time. Imacloprid will give about a years control for grubs, because it is systemic. bifenthrin gives a no quick knockdown of surface feeding turf insects that are present at time of treatment, and will also knock out fleas, ticks, chiggers, etc. However, it doesn’t kill insects NOT present. Fall armyworms fly up from the gulf coast areas as moths. They don’t lay their eggs in the turf. They lay eggs on fences, poles, tree limbs, etc. They have to be controlled after they arrive. They don’t show up every year. Please call if you notice areas (especially bermuda) that turn brown in about 1 day, so we can stop the armyworms from doing more damage. Please watch video on other post about armyworm damage. Thanks!
Robert Stroud The Turf Doctor