Eggs are laid on grass during late summer and infestations occur near these areas. There is 1 generation per year. Sod webworm injury is similar to that caused by cutworms. Plants are cut off at or just below the soil surface and holes are chewed in the leaves. Larvae make webbed tunnels near the base of the plant and down into the soil.
Damage is most severe in corn following sod or in very grassy fields.
Larvae are dark brown to black and have a dark head. The insect overwinters as small larvae and there are 2 or 3 generations per year. This information subject to a usage policy .