47 



at least 90% of the trapped weevils coming from the units in which the infesta- 

 tions occurred. This incidence of captured weevils and infestations was 

 directly related to the distance from considerable boll weevil infested cotton 

 acreage outside the experimental area. The apparent relationship between these 

 factors and results of a migration study by Cross indicated that boll weevil 

 migration into the eradication zone did occur. Closely considering all possi- 

 bilities, and given the fact that the 33 fields found infested, comprising 9.0% 

 of the total acreage, were located in the northern one-third of the eradication 

 zone, it is surmised that the majority of the infestations found in 1973 were 

 caused by migrant, gravid females, 



81. . 1976. Operational plan and execution of the Pilot Boll Weevil 

 Eradication Experiment. In^ Boll Weevil Suppression, Management, and 

 Elimination Technology. Proceedings of a Conf., February 13-15, 1974, 

 Memphis, Tennessee. U.S. Agric. Res. Serv. [Rep.] ARS-S-71, pp. 62-69. 

 The eradication plan developed for use in the PBWEE involved the integrated 

 use of several suppression techniques, which included the use of chemical, 

 biological, and cultural control methods. The suppression techniques were 

 executed intensively in the eradication and first buffer zones. In the second 

 and third buffer zones, they were executed less intensively, since these areas 

 *■ -were designed to lessen the likelihood of boll weevil migration into the 

 eradication zona. The eradication scheme utilized eight techniques which 

 were designed to progressively reduce the boll weevil population to achieve 

 elimination. These techniques were (1) in-season control, (2) reproduction- 

 diapause control, (3) cultural control - defoliation, (4) cultural control - 

 stalk destruction, (5) pheromone traps, (6) trap crops, (7) pinhead square 

 treatment, and (8) sterile-male releases. 



