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167. ; Adkisson, P. L.; and Fye, R. E. 1973. Seasonal abundance of H eliothis 

 larvae on cotton in the Presidio, Texas area. J. Econ. Entomol. 66: 524-526. 



In 1967, a typical bollworn-tobacco budworm population curve with generation peaks 

 at approximately 30-day intervals was established for the 150 fields in the fall 

 boll weevil control program aimed at killing diapausing boll weevils with azin- 

 phosmethyl. The greatest numbers occurred during the 2nd week of October. Pro- 

 ducers in the Redford area stopped controls for bollworms when treatment for boll 

 weevils began and populations increased to 22,000 larvae/acre. In Presidio some 

 producers continued to treat for bollworms when treatment for boll weevils began 

 and populations increased to approximately 12,000/acre. In Candaleria, very little 

 insecticide was applied during the growing season but larval populations during 

 the fall spray program never attained the high of 10,000 larvae/acre recorded 

 earlier in the season. 



168. Coppedge, J. R. ; Bull, D. L.; House, V. S.; Ridgway, R. L.; Bottrell, 

 D. G.; and Cowan, C. B., Jr. 1973. Formulations for controlling the 

 release of synthetic pheromone (grandlure) of the boll weevil. 2. 

 Biological studies. Environ. Entomol. 2: 837-843. 



Trapping studies were conducted in a lar^e field cage and in the field as part 

 of a coordinated effort to develop a formulation that would control the re- 

 lease of grandlure, the synthetic pheromone of Anthonomus grandis Boheman. 

 From these and related studies, two new formulations were developed that con- 

 trolled the release of this pheromone. These formulations were evaluated 

 extensively at several locations and found to be effective for at least two 

 weeks, during which period they were more attractive than either caged male 

 boll weevils or current formuations. Evidence presented showed clearly that 

 attractiveness of any grandlure formulation is influenced by the dose and 

 relative proportions of the four components of the pheromone. 



