296 ' 



569. ; McKibben, G. H. ; Cross, W. H.; Essig, H. W. ; and Lindig, 0. H. 

 1976. Boll weevil: square ingestion or utillz?tion studies. Ann. Entomol. 

 Soc. Am. (9: 73S-739. " - ■• 



Laboratory-reared ^ boll weevils, Anthonomus grandis Boheman, ate ca. 13 mg of 

 squares per day though field-collected weevils ate only 10 ing per day; however, 

 the field weevils were 9% more efficient in the utilization of squres. Labora- 

 tory weevils utilized 23% of nitrogen consumed. They digested 5.5 cal/day, 

 which means that ca. 49% of the. energy consumed was metabolized. 



570. ; McKibben, G. ; Cross, W. H.; and Haynes, J. 1975. Cotton squares: 

 increase in density after oviposltion by the boll weevil and its possible 

 implication. J. Econ. Entomol. 68: 207-208. 



Col^Oli squares containing an egg deposited by Anthonomus grandis Boheman "^ 



were significantly denser than cotton squares for did not contain an egg. 

 This increased density may cause mortality of the egg stage. 



571. ; McKibben, G. H.; Gueldner, R. C; and Cross, W. H. 1975. Irradiated 

 boll weevils: pheromone production determined by GLC analysis. J. Econ. 

 Entomol. 68: 521-523. 



The production of pheromone by Anthonomus grandis Boheman when treated ; /' 



with 10,000 rad of CO-60 gamma irradiation compared favorably with that 

 of control weevils for 5 days; however, feeding (determined by frass 

 collection) was reduced from day one. No direct correlation was found 

 between production of pheromone and elimination of frass. 



572. ; McKibben, G. H.; Johnson, W. L.; Merkl, M. E.; and Cross, W. H. 

 1976. Pheromone production by overwintered boll weevils. Environ. 

 Entomol. 5: 101-102. 



Overwintered ^ boll weevils, Anthonomus grandis Boheman, were found to pro- 

 duce only very small quantities of pheromone. Also, the ratio of the 4 



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