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313. Hanna, R. L. 1975. Chemical control of cotton insects in the Brazos 

 Valley of Texas. Folia Entomol. Hex. 33: 22. (In Spanish, abstract 

 only) . 

 Cotton is grown in widely different geographical areas in Texas. Much of 

 the crop is produced in the northwestern plains area where most insects are 

 suppressed by climatic factors. Problems in the Brazos river valley repre- 

 sent those of the alluvial valleys and the coastal plain and are common to ! 



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many cotton production areas of the Mexican States. Needs for chemicals in 

 the pest management program for cotton generally fall in one of two categories: 

 those needed at low rates early in the season to limit damaging populations of 

 insects such as thrips and fleahoppers that interfere with early growth and 

 fruiting and those needed at higher rates to protect set fruit from insects 

 such as Heliothis , boll weevil and pink bollworm. Integrative dosages of a 

 number of insecticides have been determined for use in the first category. 

 Boll weevil and bollworm control is still being accomplished in most cases 

 by a number of organophosphorus compounds. Control of resistant strains of 

 the tobacco budworm has been obtained only by the use of methomyl dust. 



314. Hardee, D. D. 1970. Pheromone production by male boll weevils as 



affected by food and host factors. Contrib. Boyce Thompson Inst. 



24(0ct./Dec.): 315-321. 

 An investigation of the influence of diet on production of pheromone by the ' t 



boll weevil, Anthonomus grandis , revealed that: 1) laboratory-reared males j 



i 

 were as attractive as native males if they had access to cotton squares I 



(flower buds) as food; 2) males fed cotton squares, bolls and blooms were 1 | 



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considerably more attractive than males fed terminals, cotyledons, and ' J 



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leaves; 3) pheromone production was reduced by about 50 percent 1 hour and • 1 



over 90 percent 24 hours after food was removed; 4) males survived well and i 



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