ae 
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Circular No. 682 
October 1943 @ Washington, D. C. 
UNITED STATES DEPARTMENT OF AGRICULTURE 
Strains of Flue-Cured Tobacco Resistant 
to Black Shank 
By James F. Buuiock, agronomist, Division of Tobacco Investigations, Bureau 
of Plant Industry, Soils, and Agricultural Engineering, Agricultural Research 
Administration, and E. G. Moss, senior agronomist, Division of Tobacco Investt- 
gations, of this Bureau, and assistant director, Tobacco Branch Station, North 
Carolina Agricultural Experiment Station and Department of Agriculture 
United States Department of Agriculture, Agricultural Research Adminis- 
tration, Bureau of Plant Industry, Soils, and Agricultural Engineering, in 
cooperation with the North Carolina Agricultural Experiment Station 
and Department of Agriculture 
Page Page 
Meeting an urgent need___-_----__----------- 1 | Testing for disease-resistant parents__----___- 5 
FAUSCTIOUSH PRODI CIs seas ee We ee 2 | Description of parents stock_______------_____ 5 
Cause and symptoms of black shank________- 3.| Development of resistant strains__________.___ 6 
DV ISSETMIM At 1O Metres en eee ae 4 | Status and description of resistant strains____ 9 
MEETING AN URGENT NEED 
Black shank, one of the most destructive of tobacco diseases, is a se- 
rious menace to tobacco culture in the western part of the flue-cured 
producing area of North Carolina and Virginia and is threatening to 
become serious in the central and eastern parts. Caused by a soil- 
inhabiting fungus, this disease, under favorable conditions, can attack 
the tobacco plant at any stage of growth. Once established in the soil 
it usually spreads rapidly. 
Four strains of flue-cured tobacco resistant to this disease are now 
available and have been given the names Oxford 1, Oxford 2, Oxford 3, 
and Oxford 4. Described here, they are at this time recommended for 
use only where the disease is present; in such areas, however, they 
535097°—43 
SLs RA RY 
CURRENT SERIAL RECORD 
NOV 1 - 1943 
