PLATE 6 
A. —Leaf roll tuber unit, Green Mountain variety, with net-necrosis stem-end 
quarters planted at the left. Photographed July 9, 1919, in northeastern Maine. 
(Lot 11 of Table VIII.) Note the smaller size and less advanced stage of the plants 
from the quarters affected with net-necrosis. 
B. —Irish Cobbler branch with leafroll in top, from bud of originally healthy stock 
near leafroll scion. For control grown in the same hill but ungrafted, see C. 
C. —Branch from ungrafted stalk. . Control in same hill as the branch shown in B. 
