The Effect of Late-Season Applications of Insecticides on Diapausing Boll Weevils1

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Abstract
Three insecticides were applied to cotton plants from August 22 through November 20, after the normal control program was completed, to determine the effect on diapausing boll weevil (Anthonomus grandis Boh.) populations under caged conditions. Determinations by dissection indicated relatively large numbers of weevils diapaused in the toxaphene and calcium arsenate treatments but only one diapaused in the plots treated with methyl parathion. These results indicated that properly timed late-season insecticide applications, coordinated with cultural practices, may be effective in reduction of the overwintering boll weevil population.

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