PLATE i 
Portions of rose canes affected with Botryosphaeria ribis G. & D. 
A, B.—Cankers as observed on March 21, 1923. The causal parasite has apparently 
entered through the small shoots at the center of the lesions. 
C, D.—Blighted canes on June 28, 1923. The pycnidial pustules of the fungus 
appear as lighter colored areas distributed over the surface of the bark. 
E.—Cankered portion of a cane of Rosa setipoda showing enlarged stem with the bark 
very much roughened and broken. Specimen received from the Federal Horticul¬ 
tural Board, October, 1922. 
(844) 
