- 37 - 



N. C. The Control of Tobacco Diseases by Soil Fumigation * 



(l) , Learn effectiveness of soil fumigants against parasitic 

 nematodes and other soil borne organisms pathogenic in 

 tobacco. (2) Study dosage, method of application and 

 treatment conditions for fumigants used in soil. (3) Learn 

 effects of soil fumigants on yield, grade distribution, and 

 value of tobacco and on chemical composition of cured leaf. 

 (4) Formulate recommended procedures for soil fumigation 

 practice. 



PI. Path. 92 



P. R. Tobacco Breeding . To obtain cigar-filler and chewing 

 types of tobacco resistant to tobacco-mosaic virus, Marmor 

 tabaci Holmes, and adapted to Puerto Rican conditions. 

 Agron. 62 



Tenn. Production of Burlev Tobacco . To study (l) influence of 

 soil type and fertilizer, manure, and liming treatments on 

 yield and quality of leaf, (2) effect of preceding crops and 

 length of crop rotation on yield, quality, and disease control, 



(3) hybridization and selection, with special regard to disease 

 resistance, for strains better adapted to Tennessee conditions, 



(4) influence of ciiring conditions on quality of leaf, and (5) 

 effect of cultural practices on yield and quality. 



Agron. 37 > Coop. USDA 



Tenn. Breeding Disease-Resistant Tobacco . Develop a dark tobacco 

 resistant to diseases of economic importance. Incorporate 

 such resistance into acceptable varieties. Refine by breeding, 

 lines so obtained, into a high yielding variety that will 

 bring a high market value under existing requirements. Test 

 under local conditions all lines of tobacco that may offer 

 control of prevalent diseases by utilizing resistance, and to 

 evaluate same for market quality. 

 PI. Path., Hort. 132, Coop. USDA 



Va. Investigation of Some Aspects of the Etiology and Control 



of Tobacco Root Rot Disease-Complexes . To investigate as 

 many different aspects of the etiology and control of tobacco 

 root rot disease -complexes as possible, in an effort to improve 

 vigor, quality, and per acre yield of tobacco crop in the area 

 as measured by per acre value of the crops. 

 PI. Path., PI. Physiol. 86013 



