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



Plate XI. 















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Fig. 1.— Potato Curly-Dwarf. A Diseased and a Healthy Plant of the Same 

 Variety, Seedling No. 16503, Alexander No. 1 Red x Keeper. Houlton, 

 Me., 1912. 



Fig. 2.— Potato Curly-Dwarf. An Advanced Case Between Two Nearly Nor- 

 mal Hills. No. 13372, Holborn Abundance X Irish Seedling. Compare 

 Plate XIII, Figure 1, Which Shows the Yield from These Hills. Houlton, 

 Me., 1913. 



