-31- 



Ark. Etiology and Control of Certain Soil-Borne Diseases of 



Cotton * To learn what etiological factors are associated with 

 destructive incidence of Fusarium wilt-root knot complex & 

 devise or improve methods for its control thru varietal re- 

 sistance, soil fumigation, green manuring, better methods of 

 culture & improved fertilization techniques* 

 PI. Path. 394 



Ark. Etiology and Control of Seedling Blights and Boll Rots 



of Cotton . (1) Learn distribution & importance of seedling 

 blights & boll rots of cotton in state. (2) Ascertain viru- 

 lence of various organisms associated with cotton seedling 

 diseases & boll rots. (3) Study influence of soil types, 

 current cultural practices & previous cropping history on 

 cotton seedling & boll complex. (4) Develop control methods 

 thru chemical seed &/or soil treatment, modified cultural 

 procedures &/or varietal resistance. 

 PI. Path., Agron. 422 Coop. USDA 



Ark. Pink Bollworm Control in Arkansas , (l) Learn probable 



future importance of bollworm as a pest of cotton in State. 

 (2) Develop control measures applicable to State agricultural 

 practices & climatic conditions. 



Agron. 453 (S-37) Coop. ARS (Also see Part 7, Section a.) 



Ark. Biological and Physiological Factors in Relation to Boll 



Weevil Abundance and Control . To (1) study activity of boll 

 weevil & relate this activity to selection of particular cotton 

 fields or plant types & to insecticidal & cultural control 

 methods, (2) evaluate earlier biological studies in relation 

 to present control practices, (3) study effect of physical 

 characteristics of plant on activity, (4) study effect of 

 physical environment & feed on longevity, fecundity, appear- 

 ance & development of diapause & relate this information to 

 improvement of control methods. 

 Ent. 461 



Calif. Study of the Basic Factors Influencing the Development 



of Strains or Types of Cotton Resistant to Verticillium Wilt . 

 To learn (1) influence of moisture, temperature & nutrition 

 to infection by verticillium wilt fungus & development of 

 disease in cotton, (2) infection court & progression of 

 fungus in plant in relation to symptoms, (3) different strains 

 of fungus as they are related to development of resistant cotton, 

 (4) source of resistance & study inheritance of resistance. 

 Field Crops, PI. Path. 1651 Coop. ARS 



