WHITE BURLEY TOBACCO RESISTANT TO ROOT-ROT. 9 
sistant strains have made on the average a normal growth each year. 
This land, therefore, has been made to produce six crops in succes- 
sion by the use of the resistant Burley variety. The comparative 
Fic. 2—Resistant White Burley and ordinary White Burley strains of tobacco grown on 
“sick ”’ soil in alternate rows. The rows of ordinary Burley have made almost no 
growth since transplanting. Farm of E. F. Shropshire, Lexington, Ky., 1916. 
growth of these resistant strains and the ordinary types of Burley 
is shown in figures 2 and 3. In northern tobacco districts, where old 
tobacco soils are more easily obtainable for such tests, fair crops of 
lic. 3.—Resistant White Burley and ordinary White Burley strains of tobacco grown on 
“ sick”? soil on the farm of BE. IF. Shropshire, Lexington, Ky., in 1917, showing the rela- 
tive growth early in the season. 
resistant Burley have been grown after 12 successive crops of tobacco. 
Lesults similar to those secured at the Shropshire farm have been 
obtained at several other places, indicating the general occurrence of 
