Abstract
Field experiments at Florence, S. C. (1956-1959) strongly indicated the value of an insecticidal control program that started just prior to the formation of the first squares on the cotton plant and was directed primarily at the over wintered boll weevil ( Anthonomus grandis Boh.). Early insecticide application programs conducted prior to July 1 were nearly as effective as the same programs with additional later sprays when the infestation reached 10%. In 1958 the 10% level was not reached for 5 and in 1959 for 4 weeks after the early program was discontinued. There was some tendency for bollworm buildups when the early program was practiced.
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