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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 & control of tobacco root rot 

 disease-complexes as possible, in an effort to improve vigor, 

 quality, & per acre yield of tobacco crop in the area as meas- 

 ured by per acre value of the crops. 

 PI. Path. & Physiol. 86013 



Va. Breeding Tobacco for Disease Resistance . To (l) develop 



thru breeding & selection, high yielding & high quality strains 

 of flue-cured, fire-cured & burley tobacco resistant to the 

 major tobacco diseases, including black shank, Granville wilt, 

 mosaic, root knot, root rot, & the nematode-root rot complexes, 

 with attempt made to incorporate blue mold resistance into the 

 best strains, & in the case of burley, to also include wildfire 

 resistance; & (2) determine genetic behavior of resistance in 

 tobacco to several diseases under investigation in order to 

 predict possibilities from breeding with a high degree of cer- 

 tainty* 



PI. Path. & Physiol., Agron. 86018 



Va. Control of Insects Affecting the Production of Flue-Cured 



Tobacco. To (1) investigate the control of the tobacco flea 

 beetle in plant beds, on newly set plants, & on field tobacco 

 obtained from a. sprays & dusts applied to foliage, b. chlor- 

 inated hydrocarbon insecticides applied in transplant water; 

 (2) investigate hornworms from the standpoints of a. insecti*- 

 cides effective in controlling both hornworms & other insects 

 on tobacco, b. certain biological & ecological studies, & c. 

 control with new type black-light traps; (3) determine the 

 effectiveness of systemic insecticides applied in transplant 

 water in controlling the green peach aphid & flea beetle; (A.) 

 determine the effects of new & promising insecticides on the 

 flavor & aroma of tobacco products, & (5) develop control meth- 

 ods for other tobacco insects if they should constitute a major 

 problem. 



Ent. 86054 Coop. ARS 



