Abstract
In field experiments conducted in DeSoto County, Mississippi, in 1961-62, selected procedures were evaluated for effectiveness in preventing the boll weevil,Anthonomus grandis Boheman, from entering diapause. Methyl parathion spray (0.5 lb/acre) was applied at 7- to 9-day intervals in the fall of 1961, when the first boll weevils were found in diapause. A desiccant, pentachlorophenol, was used to terminate plant growth in mid-October. Control measures reduced both fall and spring weevil populations, but these reductions were not large enough to substantially reduce the number of insecticide applications needed for boll weevil control in the next crop season. Population pressure in September decreased effectiveness of methyl parathion in October, and an abundance of food (squares, flowers, and bolls) for surviving boll weevils in treated fields contributed to the less-than-desired effectiveness of the control program.
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