The adult webworm is a small (1/2 inch) white moth which lays eggs at night on hosts such as sorghum, Sudan grass, johnsongrass, broom corn and rye. These eggs hatch in about five days resulting in green, bristly larvae. Of the three head feeding caterpillars on sorghum, corn earworm, sorghum webworm, and fall armyworm, the sorghum webworm has by far the most hairs and spines.
These insects are primarily head feeders, though some foliage feeding may occur.
| Insectcide | Rate per Acre | Days to Harvest or Forage |
|---|---|---|
| Baythroid 2 | 1.3 to 2.8 fl oz | 14 |
| Dipel ES (Bt) | 1 to 4 pt | 0 |
| Fury | 1.9 - 4.3 fl. oz. | 14 (Grain & Stover) 45 (Forage) |
| Lannate SP | 1/4 to 1/2 lb | 14 (Grain, grazing, or feeding) |
| Lorsban 4E | 1 pt | 30 (Grain, forage, fodder, hay, silage) |
| Mustang Max | 1.76 to 4.0 fl oz | 14 (Grain & stover) 45 (Forage) |
| Sevin 80 WSP | 1.25 to 2.50 lbs | 21 (Grain or fodder) |
| Tracer (Naturalyte) |
1.5 to 3.0 fl. oz. | 7 (Grain or fodder) 14 (Forage or hay) |
| Warrior | 2.56 to 3.84 fl oz | 30 (Grain) Do not graze or harvest for feed |