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Tenn. Control of Cotton Vertlclllium Wilt , To (l) develop 



means to reduce loss from the disease by study of contributing 

 environmental factors, determining range of the disease in 

 Tennessee, differentiating incidences of Verticillixim and 

 Fusarium wilts, determining means of spread of causal organism, 

 aind developing cropping systems to restrict further spread and 

 minimize losses where disease now deists; (2) study use of 

 fungicides, soil fumigants, and antibiotics to reduce incidence 

 of the disease; and (3) breed a Verticillium and Fusarium wilt- 

 resistant upland cotton acceptable to Tennessee. 

 PI. Path. 135 



Tex. The Seedling Disease Complex of Cotton , (l) Extend and 



intensify existing knowledge of occurrence and importance of 

 fungal pathogens of cotton seedling disease complex in terms 

 of geography and soil type. (2) Establish standard physiological 

 responses for principal species of complex, as: cardinal tem- 

 peratures, growth on standard artificial and synthetic media, 

 growth in soils of different levels of moisture and organic 

 matter. (3) Develop system of seedling disease grades 

 reflecting relative symptomatology on quantitative basis and 

 adaptable to current statistical methods. (4) Evaluate in 

 terms of disease grades, responses of major commercial 

 varieties and representative genetic types of cotton to 

 seedling disease complex in soils at controlled temperature 

 levels. (5) Cooperate with existing programs in selecting 

 for tolerance of seedling diseases within current material. 

 or in adding tolerance by hybridization ajid selection. (6) 

 Examine prior treatment of seed, as to fuzzy, reginned, acid- 

 delinted or flamed, in light of possible predisposition to 

 seedling disease. (?) Evaluate selected chemicals, applied to 

 seed prior to planting or mixed in covering soil, as means of 

 controlling losses from seedling disease. 



PI. Physiol., PI. Path., Agron. 990, Coop. ARS 



Tex. The Influence of Physiological Factors on the Expression of 



Parasitic Diseases of Cotton . To (l) study relation between 

 organic and inorganic content of cotton seeds and their 

 susceptibility to seedling diseases, (2) learn relationship 

 between the supply of major and minor nutrient elements and 

 resistance of cotton to bacterial blight, and (3) learn effect 

 of increased concentrations of certain minor elements in cotton 

 seeds on seedling disease resistance. 



PI. Physiol., PI. Path., Agron. 1007, Coop. ARS 



