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287 



547. Lukefahr, M. J., and Maxwell, F. G. 1969. The differential resistance 

 mechanism in female Pampe . sp. trees to the boll weevil. Ann. Entomol. 

 Soc. Am. 62: 542-544, 

 Numerous adult Anthonomus grandis Boheman (Coleoptera: Curculionidae) , emerged 

 from infested buds collected from the male tree of the dioecious species Hampea 

 sp., but no weevils emerged from about 1000 female buds. Dissection of infested 

 female buds and periodic observations of male and female trees near Martinex de 

 la Torre, Veracruz, Mexico, between September 1966 and August 1967 revealed a 

 unique mechanism of resistance in the female tree that discourages selection 

 by adult female boll weevils and p -events subsequent development of the larvae. 



M 



548. McCarty, J. C, Jr.; Jenkins, J. N.; and Parrott, W. L. 1977. Boll 



weevil resistance, agronomic characteristics, and fiber quality in pro- 

 genies of a cotton cultivar crossed with 20 primitive stocks. Crop Sci. 

 17: 5-7. 

 Primitive race stocks of cotton ( G&ssypium hirsutum L.), were crossed and back- 

 crossed twice to the recurrent cultivar 'Deltapine 16'. These progenies were 

 evaluated for boll weevil ( Anthonomus grandis Boheman) , cviposition suppression 

 in 1973, 1974 or both, and for agronomic characteristics and fiber quality in 

 1973. Lines were grown in replicated field tests, and oviposition was measured 

 weekly during the fruiting period under boll weevil infestations. T-25B-58 

 (BC-F™), and T-209 (BC2F ) had significantly less oviposition than the control, 

 Deltapine 16 in 1973. Resistance is in diverse genetic stocks of cotton, which 

 might be of economic importance. The agronomic characteristics and fiber pro- 

 perties of the progenies have rapidly approached those of commercial cultivars. 

 Since no character associated with the primitive race stock adversely affected 

 agronomic quality, these lines might be useful in the development of boll weevils 

 resistance cottons if satisfactory yields could be obtained. 



