81 



148. , and WooJs, C. W. 1979. Metabolism of ^"^C-penf luron in the boll 

 weevil. J. Econ. Entorool. 72: 781-784. 



The metabolism of C-penfluron (2. 6-dif luoro-N-[ [ [4- (trif luoroniethyl)phenyl]= 

 amino) C-carbonyl Jbenzamide) were studied in Anthonomus grandls grandis Bohe- 

 man. Recoveries of radioactivity of 99 and 94.36% were obtained after 4 days 

 and 1 week, respectively, from weevils that had been injected with 124,970 

 DPM (4.61 ug/weevil) . On the basis of the total injected amount, 97.74% 

 of the label recovered from the extract of weevils 4 days posttreatraent were 

 unchanged penfluron and 0.16% was conjugates. Similarly at 1 week posttreat- 

 ment, 90.56% were unchanged penfluron and 0.2% was conjuf^ates. Less than 1% of 

 additional radioactivity was recovered from weevil residues in both experimenta. 

 Four days posttreatment, recovery from excreta extract was 1.02%; 0.33% was 

 unchanged penfluron; 0.06% was 2, 6-dif luorobenzamide; and 0.63% was conjugates. 

 Similarly, at 1 week posttreatment the recovery from excreta extract was 3.41%; 

 1.33% were unchanged penfluron; 0.20% was 2, 6-dif luorobenzamide; and 1.87% 

 were conjugates. The conjugates consisted of 2 metabolites which upon acid 

 hydrolysis yielded a single relatively nonpolar metabolite that was assumed 

 to be a hydroxylated derivative of penfluron. 



149. Chang, T.-H. and Rieraann, J. G. 196i. H-^-thymidine radioautographic 

 ^,. study of sperniatogenesis in the boll weevil, Anthonomus grandis 



(Coleoptera: Curculionidae) . Ann. Entomol. Soc. Am. 60: 975-979. 



The time sequence of spermatogenesis in the boll weevil, Anthonomus grand is 



3 

 Boheman, was studied with H -thymidine radioautography. The sperm^itocytes 



required 10 days to matrre into sperr" (from the prcmeiotic DNA synthetic 



period). Of these, a little more than ^ days is used to reach prophase I, 



less than 1 day is spent in meiotic devision, and mure than 5 days is spent 



in sperraiogenesis. The cyst cells, some epithelial cells of the vas 



deferens, and folJicle cells were also labeled with thymidine. 



-' 1. 



