187 



361. , and Mitchell, E. B. 1977. Fractionated irradiation of boll weevils 

 during pupal development: Effect of sperm depletion and transfer as 

 measured by female responsiveness. J. Econ. Entoraol. 70: 411-A12. 



After virgin matings with sterile males (previously mated -03 times) the re- 

 sponsiveness of females of Anthonomus grandis Boheman to grandlure was twice 

 that of females mated with normal males. The higher responsiveness of females 

 mated with sterile males indicate 0-66% fewer sperm were transferred to the 



spermathecae and these females continued seeking other males. After 3 matings, 



60 

 sperm transferred by CO irradiated males was reduced by 67% or more. 



362. ; Mitlin, N.; Davich, T. B. ; Dawson, J. R. ; McGovern, W. L. ; and 

 McKibben, G. H. 1977. Sterilization of boll weevil pupae with fraction- 

 ated doses of gamma irradiation. Entomol. Exp. Appl. 21: 51-62. 



Fractionated doses of 6,250-8,000 rads of gamma irradiation when administered to 

 pupae of the boll weevil, / -honomus grandis Boh., sexually sterilized both sexes. 

 Mortality of males thus treated with 6,250 and 8,000 rads via fractionation was 

 1A% and 27% respectively, by 5 days posttreatment compared with A6% mortality 

 when an equivalent acute dose was administered to newly emerged adults. Phero- 

 raone production of males irradiated at 6,250 rads was one-third that of the con- 

 trol for the first 4 days, but equal that of the control during 5-11 days post- 

 "treatment. This procedure lends itself to the large-scale ste«-ilization of 

 weevils needed in an eradication program. This technique is applicable to other 

 insects that are highly susceptible to acute doses. • 



363. ; Mitlin, N.; Davich, T. B.; Dawson, J. R.; Woods, C. W. ; and Terry, 

 P. H. 1972. Chemosterilants screened against the boll weevil in dipping 

 and feeding tests. U.S. Pep. Agric. Prod. Res. Rep. 141, 21 pp. 



Ninety-eight candidate chemosterilants were tested in dipping and feeding 

 tests on the boil weevil. 2-Pyridinethiol 1-oxide sodium salt and tretaraine 



