

108 



201. . 1972. Effect of male-baited traps on populations of boll weevils. 

 Folia Entomol. Mex. 23-24: 19. (In Spanish). 



Stiidies were conducted in a reproduction-diapause control area in West Texas 

 and in a diapause control area in East Mississippi on utilizing male-baited 

 traps as a possible boll weevil suppression measure. In Texas, trap place- 

 ment with respect to cotton, and the value of systemic-treated and untreated 

 small trap plots of cotton was studied. In Mississippi the effect of trap 

 density was studied. Trap catch results and the infestation levels found 

 in the trapped fields will be presented. The factors which influenced the 

 trap catches and the infestation levels will be discussed. 



202. . 1976. Boll weevil sterility. In Boll Weevil Suppression, Management, 

 and Elimination Technology. Proceedings of a Conference, February 13-15 

 197A, Memphis, Tenn. U.S. Agric. Res. Serv. [Rep.]] ARS-S-71, pp. 53-58. 



In 1966 we contracted the Southern Research Institute at Birmingham, Ala., to 



conduct an extensive screening program for new promising chemosterilants. 



During a period of A years they screened well over 3,000 candidate materials, 



some of which we are still following up to this day. Additionally, we had 



extensive cooperation from Agricultural Research Service laboratories in 



Fargo, N. Dak., Florence, SC, and Baton Rouge, La. A number of premising 

 .- — ^ 



leads cam out of this cooperative program, and busulfan, the chemosterilant 

 of choice at present, was found. They found that prolonged feeding of this 

 material could cause male sterility in excess of 95%. Busulfan, if manipulated 

 properly, can and will sterilize males without causing undue damage to either 

 the vigor or libido of the weevils. It has two disadvantages: (1) it does 

 not sterilize a high enough percentage of the females, which means that we 

 have to separate the sexes, and (2) there is very little margin of error in 

 the required concentration. In other words, the sterile dose and the lethal 

 dose are quite close. A combination of busulfan and hempa appears to be 



