Seasonal Occurrence of Diapause and Hibernation of the Boll Weevil in North Carolina12

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Abstract
Investigations on the seasonal occurrence of diapause and hibernation of the boll weevil, Anthonomus grandis, Boheman, were conducted during 1961-62 in and near a cotton-field with a high productive level and effectively treated with insecticides for boll weevil control and a field with a low productive level and virtually untreated. With one exception, the initiation of diapause in the field was closely associated with the onset of maturity in the cotton plants. Dia-pausing weevils began to hibernate in late August near the untreated field and late September near the treated field. A large number of weevils hibernated rather abruptly during late September near the untreated field. However, the number of weevils in hibernation near the untreated field gradually declined during October and November, indicating that many of the hibernating weevils apparently died prior to the onset of winter. During the same period, the number of hibernating weevils steadily increased near the treated field.[long dash]Authors.

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