In-Field Traps and Insecticides for Suppression and Elimination of Populations of Boll Weevils123

Abstract

Grandlure-baited in⋅field traps used at the rate of 10/acre captured 76% of a population of overwintered Anthonomus grandis Boheman estimated to number ca. 25/acre that emerged between the time cotton was planted and the time the plants produced pinhead squares. A combination of in-field traps and insecticides captured or killed 100% of the emerging overwintered weevils during the 23 days between the pinhead square stage of plant growth (June 13) and July 6. The traps alone captured ca. 96% of a late emerging population of ca. 1 boll weevil/acre during July 6–31. The problem of clumping of F1 and F2 progeny proved to be an important factor in the efficiency of the traps.