Suppressing low level boll weevil populations with traps: influence of trap placement, grandlure concentration and population level
1988
Leggett, J.E. | Dickerson, W.A. | Lloyd, E.P.
Marked overwintered boll weevils, Anthonomus grandis Boheman, were released in 2 ha plots of squaring cotton to determine the efficiency of traps at a density of 2.5 per ha. The traps were baited bi-weekly with 10 mg. grandlure dispensers. The traps were 100% efficient in capturing females in plots with 2 females plus 1 male or 4 females plus 2 males and 63% efficient in capturing females in plot with 8 females plus 3 males. The use of traps baited weekly with 3 mg of grandlure to suppress low level native boll weevil populations was determined to be effective when the estimated seasonal population was <0.3 boll weevils per trap (estimated 0.93/ha). With estimated seasonal populations of .04 to .13 boll weevils per trap (estimated 0.10-0.36/ha), the traps (baited bi-weekly with 10 mg of grandlure) eliminated reproduction in 80% of the producer fields. Boll weevil (BW) capture was influenced by trap placement at an estimated seasonal populations 0.3 Boll weevils/trap in 1982, but trap placement was not a factor in weevil capture with higher or lower populations in 1983 and 1984.
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