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Ark. Etiology and Control of the Verticillj-um Wilt of Cotton 



in Arkansas , (l) To make a thorough study of morphology and 

 physiology of the pathogen of Verticillium wilt disease of 

 cotton especially from point of view of its pathogenicity 

 under varying climatic and nutritional conditions and to 

 study possibility of biological strains together with the 

 possibility that there are variations arising from an 

 unrecogrdzed sexual process; (2) study reaction of the 

 pathogen to various types of commercial and wild cotton smd 

 determine nature of resistance displayed by some of them, 

 and, to a limited extent, by ordinary cotton strains, to 

 this disease; (3) measure by lab, greenhouse and field plot 

 methods degree of resistance of all available selections of 

 upland cotton and other possible breeding material with a 

 view to providing basic material to be used in cotton 

 breeding program to develop suitable commercial cotton 

 varieties for use in Arkansas and other similar areas; 

 (4) determine environmental conditions which modify severity 

 of outbreaks of Verticillium wilt of cotton; and (5) devise 

 methods of controlling or ameliorating severity of attacks 

 of disease through soil amendments, improved cultural methods, 

 rotation, control of soil insects, nematodes, etc. and through 

 use of soil fumigants and fungicides. 

 PI. Path. 334 



Ark. Cotton Breeding and Genetics: The Development of Cotton 



Varieties Having Good Agronomic Properties and Resisfance to 

 Verticilli\im WiltT To (l) develop breeding stocks of cotton 

 resistant to Verticillium wilt; (2) learn how resistance 

 factor, when discovered, is inherited and how it can be 

 transferred to varieties of commercial importance; and (3) 

 screen advanced breeding lines developed by the station breeder 

 with respect to Verticillium wilt reactions. 

 Agron. 359 



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 

 and devise or improve methods for its control through varietal 

 resistance, soil fumigation, green manuring, better methods of 

 culture and improved fertilization techniques. 

 PI. Path. 394 



