CHERRY DISEASES 191 



(Fuckel) Sadeb. Cornell Univ. Agr. Exp. Sta. Bui. 73 : 326-327. 



1894. 

 Stewart, F. C. Notes on New York plant diseases, I. New York 



(Geneva) Agr. Exp. Sta. Bui. 328 : 340. 1910. 

 Lawrence, W. H. Some important plant diseases of Washington. 



Witches broom of cherry. Washington Agr. Exp. Sta. Bui. 83: 



25. 1907. 



FIRE-BLIGHT 



Caused by Bacillus amylovorus (Burr.) Trev. 



It has been recently shown that fire-blight, so common on 

 pear, apple and quince, also affects the cherry in the Pacific 

 Northwest. As yet, however, it is not very prevalent on this 

 fruit and the damage thus far is comparatively slight. 



The disease appears at first as small pits in the surface of 

 the fruit. The lesions are few for a time, but gradually their 

 number increases until they occur over practically the whole 

 surface. As a result the cherry becomes shrunken and wilted. 

 Amber-colored, sticky drops of bacterial ooze, similar to those 

 appearing on blighted pear fruits, are sometimes observed on 

 affected cherries. (Detailed discussion of Fire-Blight under 



Pear, page 323.) 



REFERENCE 



Hotson, J. S. Fire blight on cherries. Phytopath. 5 : 312-315. 

 1915. 



SCAB 

 Caused by Cladosporium carpophilum Thum. 



The scab disease of cherries is most prevalent on the peach, 

 and is found only occasionally on the cherry. The extent of 

 the damage done is believed to be inconsiderable. Olivaceous 

 to brownish spots appear on the fruits shortly before the ripening 

 period. Records of it come from Iowa and Minnesota. More 

 detailed discussion of the disease caused by this fungus is 

 given under Peach, page 294. 



