Bui. 213, Bureau of Plant Industry, U. S Dept. of Agriculture. 



Plate XXXI 



(A) Limb of Spitzenberg apple from Oregon attacked by a hard gall. Introduced to 

 show a secondary infection by the pear-blight organism (B. amylovorus) radiating 

 from the gall, x, y, Blighting areas covered by the bacterial exudate. 



(,B) Destructive galls on blackberry received from Prof. L. R. Jones, Madison, Wis. 

 Autumn of 1910. 



