CHERRY DISEASES 191 
a Sadeb. Cornell Univ. Agr. Exp. Sta. Bul. 73: 326-327. 
4. 
Stewart, F. C. Notes on New York plant diseases, I. New York 
(Geneva) Agr. Exp. Sta. Bul. 328: 340. 1910. 
Lawrence, W. H. Some important plant diseases of Washington. 
Witches broom of cherry. Washington Agr. Exp. Sta. Bul. 83: 
25. 1907. 
Fire-BiicHt 
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 Thiim. 
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. 
