43 



74. , and Rummel, D. R. 1976. Pheromone manipulation of boll weevils 

 entering overwintering habitats. ^ Detection and Management of the 

 loll Weevil With Pheromone. Tex. Agric. Exp. Stn. Res. Monogr. 8, pp. 

 62-65. 



A study was conducted to determine if the synthetic pheromone, grandlure, 

 could be used to manipulate Anthonomus grandis Boheman into restricted 

 overwintering sites in the fall. Pheromone sites 200 feet square within 

 heavily wooded pastures adjacent to cotton were baited with grandlure 

 from early September to early November when weevil migration was occurring. 

 To determine the effect of grandlure on the dispersion of the overwintering 

 population, leaf litter was sampled for these weevils in October, November, 

 and December. Observations showed that, for 2 out of 3 different pheromone 

 site situations tested, the grandlure baitings affected the distribution 

 of the hibernating population. The weevils were more heavily concentrated 

 in leaf litter in the pheromone-baited sites and the surrounding 200 ft 

 than they were in litter 600 or 1,320 feet, from the pheromone sites. 



75. , and Rummel, D. R. 1976. Suppression of boll weevil populations 

 with pheromone traps. In Detection and Management of the Boll Weevil 

 With Pheromone. Tex. Agric. Exp. Stn. Res. Monogr. 8, pp. 37-44. 



Pheromone traps have proved to be useful and sensitive tools for the research, 

 survey, and monitoring of the boll weevil, Anthonomus grandis Boheman. The 

 employment of pheromone traps has been greatly enhanced by the development of 

 the synthetic boll weevil pheromone, grandlure. Several large experiments 

 have been conducted that have formed the basis for most of the current concepts 

 concerning the use of pheromone traps for weevil suppression. Although much 

 valuable information has emerged from these experiments, the actual value of 

 pheromone traps as a weevil suppression tool is still poorly defined. The 

 validity of the current method used to determine trap efficiency is questionable 



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