-w uw ^ n»»mk« ' ^p mfj ju w mi ■ K-J^WLj ' -gi * " ~ -^^-iy ' / *^ '^ '^*9*rrr^ - ' J ' ** ^ f m % ^y^ i < ' » > ^ ia f MJ H l P« . '^ »v y ^ '»^' ■^■■■*' » -w "- * " ''^ r-rK-^.-^i *- ■ n«* > ^i^ :~ •.«»»/■«*»• ^^«j«*iwwi'.,- -anww i 



"1 



119 



sitlve than mature sperm. Progeny development increased with the matings 6-7 

 days after irradiation, indicating that the early cell stages were relatively 

 resistant as far as dominant lethal mutations were concerned. However, these 

 immature cell stages were readily destroyed by irradiation. Sperm production 

 between the 5th and 8th days after treatment with 2500 rad (sperm arising from 

 cells treated 5-8 days prior to maturity) was reduced by about 70%, indicating 

 extensive cell destruction even with a substerilizing dose. 



223. ; Nilakhe, S. S.; and Simmons, L. A. 1979. Mating ability of irradi- 

 ated male boll weevils treated with diflubenzuron or penfluron. J. Econ. 

 Entomol. 72: 334-336. 



Treatment of young males of Anthonomus grandis grandis Boheman with acetone 

 solutions of diflubenzuron (Dimilin®, TH-6040) , or penfluron impaired mating 

 ability. I-Iating success was often reduced by as much as 40-50%. Affected 

 males usually tried to copulate with virgin females but their movements were 

 often poorly coordinated. They sometimes achieved a partial penetration of 

 the aedeagus without transferring sperm. The males were unable to recover 

 from this deficiency. This problem was largely eliminated when the males 

 were allowed to age for at least 3 days before treatment. Diflubenzuron 

 applied as a 0.1% acetone dip by itself failed to completely suppress the 

 production ttf progeny by females. However, when combined with 8000 rad of 

 gamma irradiation, progeny suppression was complete. 



224. ; Padovani, I.; Thompson, M. J.; and Robbins, W. E. 1970. Inhibition 

 of larval development and egg production in the boll weevil following 

 ingestion of ecdysone analogues. J. Econ. Entomol. 63: 1064-1069. 



Adult female Anthonomus grandis Boheman became permanently infecund, but males 

 were not affected, when fed various analogues of ecdysone. A trihydroxy, 

 6-keto steroid was found to be particularly effective and was evaluated 



