321 



Stoneville 7A GS, and Wescot GS than on the glanded current lines. In oviposition 

 tests, the /eevils laid significantly more eggs on Acala 4-42-77 GS, Wescot GS, 

 and Coker IC OA GS than on their glanded counterparts, but there was no difference 

 in oviposition rate among the 9 other paired lines. Iri antibiosis tests, signi- 

 ficantly larger weevils were reared from reconstituted lyophilized square powder 

 diets made from 38-6 GS, Rex Smoothl.eaf GS, and Stardel GS than from similar diets 

 made from the glanded parent lines. However, similar diets made from Acala 4-42-77 

 GS produced weevils weighing significantly less than those from glanded Acala 

 4-42-77. There was no significant difference in weevil developmental period be- 

 tween the glandleas and glanded pairs studied. The results suggest that the 



glandless genes may not create increased susceptibility to the boll weevil, <^ 



especially if care is exercised in the selection of the genetic background in 

 which the genes will be placed. 



622. Meeks, R. A., Jr.; Lloyd, E. P.; Robinson, R. C.; and Merkl, M. E. 



1966. A large-scale field evaluation of boll weevil diapause control 



in Mississippi. J. Econ. Entomol. 59: 811-813. 

 In field experiments conducted in DeSoto County, Mississippi, in 1961-62, 

 selected procedures were evaluated for effectiveness in preventing the boll 

 weevil, Anthonomus grandis Boheman, from entering diapause. Methyl parathipn 

 spray (0.5 lb/acre) was applied at 7- to 9-day intervals in the fall of 1961, 

 when the first Loll weevils were found in diapause. A desiccant, penta- 

 chlorlphenol, was used to terminate plant growth in raid-October. Control 

 measures reduced both fall and spring weevil populations, but these reductions 

 were not large enough to substantially reduce the number of insecticide appli- 

 cations needed for boll weevil control in the next crop season. Population '""^ 

 pressure in September, decreased effectiveness of methyl parathion in October, 

 and an abundance of food (squares, flowers, and bolls) for surviving boll 

 weevils in treated field contributed to the less-than-desired effectiveness 



v.< 



