V 



284 



539. ; Tingle, F. C; and Cast, R. T. 1967. Environmental stimuli inducing 

 diapause in the boll weevil. J. Econ. Entomol. 60: 99-102. 



In laboratory studies conducted at Stoneville and Sxate College, Mississippi, 5 

 environmental stimuli induced diapause in the boll weevil, Anthonomus grandis 

 Boheman: 1) exposure to an 11-hour photoperiod in the larval and pupal stages; 

 (2) exposure to night temperatures of 10°C in the adult stage; (3) boll feeding 

 in the adult stage; (A) limitation of the quantity of squares fed in the adult 

 stage; and (5) boll feeding in the larval stage. Wild strains of weevil in 

 Mississippi responded to these stimuli, but the State College laboratory strain 

 did not. 



540. ; Tingle, F. C; McCoy, J. R.; and Davich, T. B. 1966. The reproduc- 

 tion-diapause approach to population control of the boll weevil. J. 

 Econ. Entomol. 59: 813-816. 



Six applications of a spray of methyl parathion (0.5 lb per acre) were made at 

 4-to 5-day intervals to isolated cottonfields in Carroll County, Mississippi, 

 to control reproducing and diapausing boll weevils, Anthonomus g randis Boheman, 

 during the fall. The most effective followup procedure included chemical de- 

 foliation of cotton plants to limit the available weevil food, and a final 

 application in October of Bidrin® (3-hydroxy-N, N-dimethyl-ci£-crotonamide 

 dimethyl phosphate) at 1 lb per acre. Examination of seedling cotton from 

 the treated fields the following spring indicated that in 1 field only 2.7 

 weevils per acre had survived the control program and the winter weather. 

 The boll weevil population in the treated fields did not rise to damaging 

 proportions until mid-August (the 2nd generation) . 



541. ; Tingle, F. C; Merkl, M. E.; Burt, E. C; Smith, D. B.; and Davich, 

 T. B. 1967. Comparison of three rates of application of ultra-low azin- 



>• phosmethyl in a reproduction-diapause control program against the boll 

 weevil. J. Econ. Entomol. 60: 1696-1699. 



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