-51- 



Pa. Agronomic Aspects of Improvement of Yield and Quality 



of Pennsylvania Tobacco . To (1) study rotations, fertilizer 

 applications & other soil management practices to increase 

 yields & quality of cigar filler tobacco, (2) determine spec- 

 ific factors & combination of factors which improve yields & 

 quality of cigar filler tobacco, (3) investigate new materials 

 to stimulate growth of tobacco plants in seed beds, <Sc control 

 suckers on the growing plants, & (4) study techniques of har- 

 vesting to improve quality & reduce losses of the crop. 

 Agron. 12A4-A Coop. ARS 



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., Tob. 62 



P. R. Biology and Control of Tobacco Insects , (l) Obtain bio- 



logical data on important insect pests affecting tobacco as 

 flea beetles, tobacco aphid, & the tobacco horn worm. (2) 

 Develop control measures. 

 Ent. 113 



Term. Production of Bur ley Tobacco . To study (l) influence of 



soil type & fertilizer, manure, & liming treatments on yield 

 & quality of leaf, (2) effect of preceding crops & length of 

 crop rotation on yield, quality, & disease control, (3) hybrid- 

 ization & selection, with special regard to disease resistance, 

 for strains better adapted to Tennessee conditions, (4) in- 

 fluence of curing conditions on quality of leaf, & (5) effect 

 of cultural practices on yield & quality. 

 Agron. 37 Coop. ARS 



Term. 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. 

 PI. Path., Hort. 132 Coop. ARS 



Tenn. Culture of Dark Tobacco , (l) Learn optimum spacing & 



height of topping dark tobacco on different soils at various 

 fertility levels. (2) Evaluate various chemicals for suppres- 

 sion of sucker growth after topping & compare yield & quality 

 of tobacco obtained by using these materials by hand control 

 of suckers. 



Agron. 163 



