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Term. A Study of the Life History and Means of Control of 



In s ects that Affect the Growth of Cotton * To determine 

 the harm done to the cotton plant in early stages of growth 

 "by thrips, flea "beetles, root lice, plant bugs, and, in 

 some years, boll weevil. 

 Eat. 98 



Tex. The Interrelations and Control of Insects 



Attacking Legumes and. Cotton . To (l) determine effect 

 of insect populations developed on legumes grown for 

 seed and soil improvement upon abundance of injurious 

 insects in cotton; (2) develop or discover cultural 

 methods to control or modify insect injury to cotton from 

 use of legumes for seed production and soil improvement; 

 (3) determine relation of over-wintering and abundance of 

 thrips, spider mites, fleahoppers and aphids on wild winter 

 and spring host plants in permanent and improved pastures 

 and fence rows, roadsides, etc., to migration and abundance 

 in seedling cotton; and (4) develop most economical control 

 for these insects. 



Ent., Agr. Engin., Agron. 557 Coop. ARS 



Tex. Gen etics and Improvement o f Cotton . To establish 



sound principles and practices for improvement of cotton 

 through basic research in cytology and genetics by: 

 (l) maintenance of the Gossypium species, interspecific 

 hybrids and geographic races of Gossypium hirsutu m, (2) 

 cytogenetic studies on nature of species differences, and 

 barriers, (3) cytogenetic investigations on effects of 

 individual chromosomes within species and in derivatives of 

 species hybrids, {k) development of marked stocks as an aid 

 in cytological and genetical analysis, (5) evaluation of 

 interspecific hybrids, polyploids, and primitive and foreign 

 stocks with respect to their potentialities as sources of 

 characters of economic importance, (6) genetic analysis of 

 desirable characters in interspecific hybrids and in stocks 

 derived from them, and (7) development of primary stocks which 

 possess useful characters, or combinations thereof, not found 

 in American Upland cotton. 



Agron. 600 (S-l) Coop. ARS 



