PLATE 3 
A. —Cane and roots of a Crystal White blackberry, No. 342 D, showing localized 
primary infections on two branches, k and 1, of the old cane, uninfected tip ends of 
cane, and branches cut off. No hyphae were found in sections of the cane at the 
base, and none in the roots at the cut ends shown here. 
B. —Localized primary infection at one node of a cane of a Kittatinny blackberry. 
Such local infections can not become established systemically because the canes 
die naturally before the fungus can reach the underground perennial parts of the 
plant. If such infections occurred on plants grown in the greenhouse or in the south¬ 
ernmost states where the growing season is very long, hyphae would very likely be 
able to reach the crown of the plant before the cane died. 
