Bui. 64, U. S. Dept. of Agriculture. 
Plate VIII. 
Fig. 1— Leaf-Roll in Seedling Potato No. 16518, Alexander No. 1 Red X 
Keeper. Washington, D. C, August, 1912. 
Fig. 2.— Potato Leaf-Roll, Showing Its Effect on Tuber Formation. Stolons 
Thickened and Producing Numerous Small Tubers Only. Mitchell, Nebr., 
September, 1911. 'Photographed by Fritz Knorr.) 
