Bui. 90, Bureau of Plant Industiy, U. S. Dept. of Agriculture. 



Plate 



Fig. 1.— Apple Crown-Gall on 

 Grafted Tree. 



Fig. 2.— Apple Crown-Gall on 

 Transplanted Seedling. 



Fig. 3.— Hairy-Root Disease on 

 Grafted Apple Tree. 



Fig. 4.— Hairy-Root Disease on 

 Grafted Apple Tree. 



