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Sod Webworm damage
(John Obermeyer, Purdue University)
Common Name: Sod Webworm - damage
See also: adult | larva

Scientific Name: Pyralidae: several species

Status: serious pest of turfgrass and other plants

Damaging Stage: caterpillar

Injury: Larvae attack the leaves and stems of turfgrass just above the crown. As webworm larvae mature and continue to feed, large brown patches characterize the injured turf areas. The most severe damage usually occurs in July and August.

Action Threshold: Generally, the action threshold for sod webworm larvae has been four to six per square foot. Like with most turf insects, this number can vary because the more well-maintained turfgrass stands can withstand a higher number of pests before severe damage starts to occur.

Management: Cultural, biological, and chemical controls are all effective at suppressing sod webworm populations. There are also resistant turfgrass varieties that can be planted in areas subject to constant infestations.