226 



the healthy mutants in the F2 generation. Techniques designed to eliminate 

 the disease and to insure recovery of healthy mutants in the F- generation 

 were superimposed on the genetic procedure. The method is applicable to 

 diseases of other insects in which one sex does not transmit the disease 

 during mating. 



436. ; Maxwell, F. G., and Parrott, W. L. 1967. Field evaluation of 

 glanded and glandless cotton ( Gossypium hirsutum L.) lines for boll 

 weevil ( Anthonomus grandis Boh.) susceptibility. Crop Sci. 7: 437-440. 



The boll weevil is the major cotton insect in the rain-grown cotton belt. We 

 investigated glandless cottons to determine if they were more susceptible to 

 the boll weevil than the currently grown glanded varieties. Two years' results 

 from large field plots with two pairs of glanded-glandless cottons indicated 

 that the glandless genes gl2 and gl- did not cause greater susceptibility in 

 the Acala 4-42-77 and Rex Smoothleaf lines. Thirteen pairs of glanded-glandless 

 lines were compared in small field plots. In each of the 13 comparisons no 

 significant differences were found. Antibiosis tests showed slightly larger 

 weevils on some glandless lines. These data suggest that the glandless character 

 should not create increased boll weevil susceptibility, especially with careful 

 selection of genetic background. •>•• 



437. ; Maxwell, F. G.; Parrott, W. L.; and Buford, W. T. 1969. Resistance 

 to boll weevil ( Anthonomus grandis Boh.) oviptoition in cotton. Crop Sci. 

 9: 369-372. 



Cotton ( Gossypium hirsutum L. and G. barbadense L.) lines were tested for 3 years 

 in small field plots for boll weevil ( Anthonomus grandis Boh.) resistance. A 

 total of 23, 29, and 100 lines were evaluated at one location in 1965, 1966, and 

 1967 respectively. Five frego, four red, and several Sea Island cotton lines 

 received less boll weevil ov'iposition than the commercial check line. Oviposition 



