Bui. 64, U. S. Dept. of Agriculture. 



Plate XIII. 



Fig. 1.— Potato Leaf-Roll (below) and Curly-Dwarf (above), Showing the 

 Yield OF Healthy and Diseased Hills of the Same Variety. Houlton, Me., 

 September, 1913. 



//?5S" ^ea/f/?y 



//4S6 Ci/r/y-d)yarf 



/oe/£ ^ea/ffyy 



/02/2 Ciyr/y-<yi^arf 



Fig. 2.— Potato Curly-Dwarf. Comparison of the Yield of Healthy and 

 Diseased Hills of the Same Varieties. Houlton, Me., September, 1913. 



