The adult of one species of webworm is a small (1.25 cm) white moth which lays eggs at night on hosts such as sorghum.
The other one is with dark gray forewings and the hind wings, fringed with hairs on the anterior margin, are larger than the fore wings.
The young caterpillar of one webworm is dark gray with hairs on its body. The fully grown larva measures about 13.5 mm .
The caterpillars of other webworm measures 12 mm, and is dark brown .
The larval period is 9 to 14 days during which time sorghum seeds in earheads are damaged.
Cropdamage: The caterpillars remain inside the webs formed from excreta and silken threads.
These caterpillars feed on the grain in the sorghum earheads and lower the quality of grains.
Management: No management is required unless the infestation is very severe which is not common. If required, Endosulfan or Carbaryl may be sprayed on the earheads in the early stages.
Submitted by Deepak Hiremath on Thu, 24/09/2009 - 14:57