214 



cotton aphid. Aphi s gossypii Glover. It was ineffective against the bollworm, 

 Heliothis zea (Boddie) , and the tobacco budworm, Heliothts viroscens (F.)- The 

 toxicant did not adversely affect fruiting, germination, percentage of lint, 

 seed index, or fiber quality. 



414. ; Taft, H. M. ; and Agee, H. R. 1971. Movement of the boll weevil into 

 and out of a cotton field as determined by flight screens. Ann. Entomol. 

 Soc. /jn. 64: 254-257. 



When the movement of Anthonotaus grandis Boheman (Coleoptera: Curculionidae) , 

 into and out of a cotton field was monitored for 2 years with 3 x 5-ft flight 

 screens, weevils were found to enter and leave the field throughout the season 

 with the greatest numbers occurring during August and September. The numbers 

 of weevils captured by the screens apparently reflect general activity, which 

 is continuous throughout the season; however, peak numbers captured coincided 

 with the emergence of generations. The numbers entering the field from other 

 directions did so because of the favorable hibernation sites in that direction 

 and an untreated cotton field beyond them. The flight screens were more 

 efficient in monitoring weevils entering the field than those leaving it. 



415. ; Taft, H. M. ; and James, W. 1969. Life history of the boll weevil 

 in field cages. J. Econ. Entomol. 62: 964-965. 



A study was Conducted to determine whether the number of boll weevil genera- 

 tions/season had changed since 1924-26 and to obtain more information about the 

 reproductive potential of each generation. Each generation was started with 

 marked weevils in cages containing 200 cotton plants. Each succeeding genera- 

 tion was produced by the let adults from the preceding generation. The pre- 

 ovlposition period ranged from 4 to 5.2 days and varied between years and among 

 generations. The increase in population of each generation over the previous 

 generation for the two years ranged 6-47 fold, overwintered; 16-20 fold, 2nd; 



