486 



of experience dealing with the boll weevil and related problems, will continue 

 to emphasize the development and use of all available technology to suppress 

 the boll weevil. 



960. Weaver, J. B. Jr.; All, J. N. ; Weaver, D. B. ; and Homyak, E. P. 1979. 

 Influence of various insecticides on yield parameters of two cotton 

 genotypes. J. Econ. Entomol. 72: 119-123. 



Yield parameters (insect control, lint yield, lint percentage, and micronaire) of 

 2 cotton, Gossypium hirsutum L., genotypes ('Coker 310', an adapted cultivar, and 

 an insect nonpref erred strain, OFNRS = okra leaf, frego bract, nectariless, and 

 red stem) varied according to different insecticide spray programs. Insecticides 

 included organophosphates, pyrethroids, organophosphate:pyrethroid combinations, 

 and an experimental molt inhibiting insecticide. Bollworms, Heliothis spp., and 

 the boll weevil, Anthonomus grandis grandis Boheman, were reduced in the OFNRS 

 genotype and yield was significantly higher than Coker 310 during an intense in- 

 festation when chemical control was poor. Of 14 insecticide treatments tested, 

 combinations of certain pyrethroids with methyl parathion had greatest efficacy 

 and yield of seed cotton. Fiber properties were influenced by insecticide treat- 

 ment and date of initial spray application. 



961. , and Reddy, M. S. 1977. Boll weevil nonpref erence, antibiosis, and 

 hatchability studies utilizing cotton lines with multiple non-preferred 

 characters. J. Econ. Entomol. 70: 233-285. 



Percentages of squares (flower buds) with oviposition punctures of Anthonomus 

 grandis Boheman were determined on cotton plants, Gossypium hirsutum L., that 

 carried various combiiiations of characters nonpreferred by boll weevils or show- 

 ing antibiosis. Strains were grown with and without the use of insecticides at 

 the Plant Sciences Farm, College Experiment Station, University of Georgia in 

 1974. Oviposition was reduced by the characters: frego bract, cytoplasmic male- 



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