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



Insects 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, &, in some years, 

 boll weevil. 

 Ent. 98 



Tenn. Control of Cotton Verticillium Wilt . To (l) develop means 



to reduce loss from the disease by study of contributing en- 

 vironmental factors, determining range of the disease in Tenn., 

 differentiating incidences of Verticillium & Fusarium wilts, 

 determining means of spread of causal organism, & developing 

 cropping systems to restrict further spread & minimize losses 

 where disease now exists; (2) study use of fungicides, soil 

 fumigants, & antibiotics to reduce incidence of the disease; 

 & (3; breed a Verticillium & Fusarium wilt-resistant upland 

 cotton acceptable to Tennessee. 

 PI. Path. 135 



Tex. Physiological and Biochemical Effects of Systemic Insecti- 



cides on the Cotton Plant . To (1) determine role of the plant 

 in translocation, alteration, & persistence of systemic insec- 

 ticides, to better understand mechanics of distribution within 

 plant of compounds involved; (2) investigate effect of systemics 

 on plant development, defining dosage levels & conditions at 

 which stimulation or phytotoxicity occurs; (3) determine effect 

 of systemics on plant's organic & inorganic nutrition in re- 

 lation to their insecticidal effectiveness; & (4) attempt to 

 develop a concept of alterations in chemical structure or 

 systemics which contribute to increased or decreased phytotoxi- 

 city. 



PI. Physiol. & Path., Ent. 428 Coop. ARS 



Tex. The Interrelations and Control of Insects Attacking Legumes 



and Cotton . To (1) learn effect of insect populations developed 

 on legumes grown for seed & 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 & soil improvement; (3) learn 

 relation of over-wintering & abundance of thrips, spider mites, 

 fleahoppers & aphids on wild winter & spring host plants in 

 permanent & improved pastures & fence rows, roadsides, etc. 

 to migration & abundance in seedling cotton; & (4) develop 

 most economical control for these insects. 

 Ent., Agr. Engin. 557 Coop. ARS 



