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TOBACCO 



Viruses 



Calif. An Investigation of the Mechanism of Tobacco Mosaic 



Virus Reproduction . To leam more about intimate details 

 of plant virus reproduction. 

 Bot. 1664 



Ky. Virus Diseases of Tobacco, vrith Special Reference to 



Streak . To studv the virus that causes streak of tobacco 

 to determine: (l) nat\iral method of spread of the virus, 

 (2) natural host range of the virus, and (3) properties 

 of the virus. 

 Agron. 154 



Mass. The Improvement of Havana Seed Tobacco . To improve 



Havana Seed tobacco inherently by breeding new strains of 

 tobacco \(*hich combine high resistance to black root rot, 

 common tobacco mosaic, and wildfire, with habits of growth 

 and yielding capacity that aire highly acceptable to growers, 

 and, also, the capacity to produce tobacco of type of quality 

 that are highly acceptable to cigar manufacturers. 

 Agron. 4 



Others 



Fla. Flue-Cured Tobacco Improvement . To develop varieties of 



flue-cured tobacco of good type and yield combined with 

 resistance to nematodes and other pests. 

 Agron. 372 



Ky. Breeding Studies with Tobacco . To (l) develop tobacco 



varieties resistant to black root rot, mosaic, brown root rot, 

 fusarium wilt, angular leaf spot, wildfire, streak virus, and 

 black shank; (2) improve smoking qualities of burley tobacco 

 by crossing with Turkish tobacco and selecting for aromatic 

 strains, and (3) develop smoking tobaccos of satisfactory 

 quality that are extremely low in nicotine content, and other 

 strains having a maximum total alkaloid content of about 

 2.5 percent. 

 Agron. 152 



Md. Development of Improved Strains of Maryland Tobacco 



Resistant to Diseases . To develop improved strains of Maryland 

 tobacco resistant to major diseases of tobacco, as mosaic, black 

 root rot, wildfire, black shank, Granville wilt, and fusarium 

 wilt, 



Bot,, Agron. J-95, Coop. ARS 



