A Field Study of Diapause, Diapause Control, and Population Dynamics of the Boll Weevil

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Abstract
In 1960-61, tests were conducted in 3 cottonfields located on Mississippi to study the relationship between plant fruiting and the first entry of boll weevils, Anthonomus grandis Boheman, into diapause. Tests were set up also to evaluate the effectiveness of methyl parathion in controlling diapausing weevils and to measure population increases on dryland cotton. In the diapause studies, first diapausing weevils appeared in all 3 fields at cessation of flowering, when only bolls remained as the food source. In the diapause-control studies, 7 applications of methyl parathion spray applied at ½ lb/acre greatly reduced the overwintering population but did not eliminate it. In the limited studies of population dynamics, seasonal generation-to-generation increases averaged 5-fold and ranged from 1- to 9.6-fold.

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