June defoliation is seldom sufficiently extensive to cause economic damage to cotton. Insecticide sprays for other pests will disrupt this natural control. The use of Bt cotton. Spot treatments are usually adequate for infested seedlings. When you sweep for other pests, watch for larger loopers in the sweep net.
Smaller loopers feed on older leaves where they are easily sampled using a beating sheet.
Spread a 40-inch square piece of cloth between two rows of cotton and vigorously shake an arm's length of plants from one row on to the sheet. Lay the plants back and look for worms that are looping on the cloth. The following materials are listed in order of usefulness in an IPM program, taking into account efficacy and impact on natural enemies. Not harmful to natural enemies. An insect growth regulator.