44 
Colorado Experiment Station 
sunken centers bordered with purple. These spots enlarge, run 
together, forming irregular blotches which may encircle the canes. 
Badly diseased canes have roughened bark with a scabby appear¬ 
ance. In severe cases, the canes crack, wither, and die. Affected 
canes produce dwarfed leaves and premature, undersized fruit, 
which often dries. The first indication of the disease on the leaf¬ 
stalks is the production of minute spots. The fungus spreads from 
these spots into the leaf, where small affected areas are produced 
on the under surface. These diseased spots may drop out, causing 
shot-holing. 
Control .— (i) Prune out and destroy all diseased canes. 
(2) Rotation of crops. Avoid planting on site of diseased 
plantation. 
Plate XVI. Spur Ijlight of red raspberries. The twig on the right was sprayed. 
