NOT E Interference of Boll Weevil Trapping by Spiders
NOT E Interference of Boll Weevil Trapping by Spiders (Araneida) and an Evaluation of Trap Modification to Reduce Unwanted Arthropods1 J. Scott Armstrong2 and David B. Richman3 USDA-ARS, Beneficial Insect Research Unit, 2413 East Highway 83, Weslaco, Texas 78596 USA J. Entomol. Sci. 42(3): 392-398 (July 2007) Key Words trap design, Anthonomus grandis grandis, cotton Boll weevil, Anthonomus grandis grandis Boheman, eradication is nearing comple tion throughout the U.S. as all cotton-producing regions are in active or posteradica tion maintenance, with most of the active eradication occurring in Texas. The success of eradication is almost entirely based on boll weevil traps baited with grandlure and a weekly trap capture threshold of 1 weevil per trap per week used in active eradi cation zones (Dickerson et al. 2001, Cotton Foundation, Memphis, TN, 627 p.). The Texas Boll Weevil Eradication Foundation uses a standard 10 mg grandlure dis penser (Scentry Biologicals, Billings, MT) and an impregnated kill-strip of 10% (wtwt) dichlorovos DDVP ([2,2,-dichlorovinyl dimethyl phosphate]; Heron Environmental, Emigsville, PA) to kill boll weevils in the trap and prevent their escape (Suh et al. 2003, J. Econ. Entomol. 96: 348-351). Even when a DDVP kill-strip is used in a boll weevil trap in South Texas, a significant impedance to trapping efficiency can be the predation of boll weevils by insects and spiders that enter the capture area of the trap. Spiders have been implicated as a significant factor in interfering with trapping effi ciency by preying on boll weevils or, more importantly, by webbing the entrance of the trap making it impossible for weevils to enter the capture container (Armstrong and Richman 2006, Proc.
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