438 



857. Stewart, J. R. ; Glover, D., Jr.; and Torries, W. J. 1972^ Automated 



system for mass producing diet for boll weevil adults. J. Econ. Entomol, 

 65: 861-862. 

 Increased production demands on laboratories mass rearing the boll weevil 

 prompted development of additional improvements in the mechanization of 

 rearing techniques. An automated system for producing adult diet was 

 devised which reduced labor requirements $350/million weevils. 



858. Still, G. G., and Leopold, R. A. 1979. The elimination of (N-[[(4- 



chlorophenyl)amino]carbonyl]-2,6-difluorobenzamide) by the boll weevil. 

 Pestic. Biochem. Physiol. 9: 30A-312. 

 Boll weevils, Anthonomus grandis Boheman, were either dipped in or injected 

 with a solution of [ Cjdiflubenzuron (N-[ [ (4-chlorophenyl)amino]carbonyl]-2, 

 6-difluorobenzamide) or fed on cotton squares that had been treated with the 

 chemical to determine its turnover time and metabolic fate. No significant 

 differences were observed between male and female weevils in their ability to 

 eliminate [ C]diflubenzuron. Only minor differences were observed when immer- 

 sion and injection treatments were compared. When weevils were treated with 

 66.3 ng of [^^C]def lubenzuron per weevil by injection, the insects contained 

 13 to 15% of the radiolabel after 6 days and 4 to 6% after 13 days. The re- 

 mainder of the radiolabel was in the frass. When weevils fed for 66 hr on 

 cotton squares that has been treated with a wettable [■'•^C]diflubenzurcn pre- 

 paration (Dimilin W-25), the insects averaged 120 ng of diflubenzuron per 

 weevils. Forty-four hours after removing insects from the treated squares, 

 50% o^the radiolabel had been excreted. In all cases, the radiolabel found 

 in the frass or in the weevil was unchanged diflubenzuron. There were no data 

 to indicate that the boll weevil could metabolize appreciable amounts of 

 diflubenzuron. 



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