Efficiency of Infield Traps in Detecting or Suppressing Low Population Levels of Boll Weevils 123

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Abstract
The F1 progeny of one overwintered female boll weevil, Anthonomus grandis Boheman from a “clumped” emergence pattern were detected in all of seven 2-ha cotton fields with 10 grandlure-baited infield traps/ha but in only 4 of 7 fields with 2.5 traps/ha. The probability of detecting at least one of the F1 progeny of one female was calculated with a simple model to be 63.2 and 99.1%, respectively, for 2.5 and 10 traps/ha. With 10 traps/ha, an avg of 5.0 or 71% of the females emerging in test fields were captured during a 21-day period. This capture rate was essentially equal to the expected capture rate of 83.6% of the females when uniform distribution of both traps and boll weevils and equal attraction of mate-seeking females to traps and to males was assumed. These favorable results were attributed to the ability of the synthetic pheromone released by the traps to largely overpower the attractiveness of the males despite the closer proximity of the males to mate-seeking females.

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