PLATE 5 
A. —Cultivated blackberry the second year after infection. The old canes are 
stunted and without blossoms. New shoots are in the form of a typical witch’s broom. 
The longer the rust lives in a plant the more numerous and spindling become the 
canes. 
B. —Taylor blackberry with localized primary infections at the nodes showing 
etiolated shoots. The upper part of the cane is perfectly normal and would have 
borne fruit. Such an infection will not become constitutional. The mycelium can 
not reach the root crown before the cane dies naturally. 
