PLATE 4 
A. —Common type of primary infection of Iceberg blackberry No. 334 F. The 
<cane above is normal, blossoming profusely, and is free from mycelium. Two or 
three new shoots are arising from the base of the cane. Hyphae have not yet invaded 
the base of the cane below the ground, but would have soon done so if the cane had 
not been destroyed at this time. 
B. —Iceberg blackberry in which the growing point had been injured at the 
time the shoot was inoculated. The present main cane now in blossom, b, arose at 
once from an axial bud. This cane is free from the rust except at its lowest node. 
Several infected shoots have developed from the basal part of the cane. The fungus 
has not yet invaded the root. 
