149 



estimated $1 million was spent on the research program for isolation, iden- 

 tification, and laboratory synthesis of the pheromone. No estimate of sub- 

 sequent expenditures by the various research stations involved in additional 

 research is available, but certainly the sum is appreciable. It is generally 

 agreed that grandlure-baited traps are an excellent means of boll weevil 

 population detection and survey. Conversely, there does not seem to be a 

 concensus concerning the role of grandlure in boll weevil population manage- 

 ment. While success has been achieved in certain suppression experiuents, 

 the general inconsistency of experimental results and the lack of definite 

 guidelines for population management strategies has precluded widespread 

 acceptance of grandlure as a useful population management tool. It must 

 be noted that the study of insect pheromones, particularly as regards the 

 boll weevil, is still a relatively young science. It is probable that 

 continued commitment to further research and development of pheromone 

 technology and its implications for pest population suppression will provide 

 worthwhile benefits to American cotton producers in the future. 



281. Click, B., and Mitlin, N. 1968. An immunological study of the 



antigens of Anthonomus grand is grandis and Anthonomus grand is thurberiae . 

 Ann. Entomol. Soc. Am. 61: 548-550. 

 Homogenates from boll weevil and thurberia weevil revealed the presence of 3 

 antigens. Boll weevil and thurberia weevil Ag-a, closest to antisera well, 

 and Ag-c, farthest from antisera well, exhibited patterns or fusion, and, 

 therefore, are similar antigens. The center band, Ag-b, present in the boll 

 weevil and thurberia weevil, failed to show a pattern of fusion. Therefore, 

 the double-diffusion experiments suggest that there are immunological diffe- 

 rences between the boll weevil and thurberia weevil. The slight immunological 

 differences between the eastern boll weevil and the thurberia weevil should 

 help in the taxonomic separation of these 2 weevils. 



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