Armyworm Control in Lawns Armyworms in Turf by Drs. During the past three weeks there have been reports of severe armyworm infestations in turfgrass throughout the state. Most of these infestations appear to be armyworms, most likely the fall armyworm. Some species of armyworms and cutworms can cause serious damage to all types of turfgrass. The adult noctuid moths have forewings with a rather common background color of dull brown, gray, and black, with no outstanding prominent identifying marks.
Black cutworms feed at the base of the turfgrass plant.
Leaves and stems are cut off but may not be eaten. This feeding forms brown spots, 1-2 inches in diameter. Birds feeding extensively in a grassy area may indicate the cutworm's presence. Cutworms excavate a hole into the ground to hide during the day. During the night they leave the holes to feed on plant material.