BLACKBERRY DISEASES 



161 



(See more complete discussion under Apple, page 108. See 

 also Raspberry, page 398.) 



FIG. 45. Crown-gall disease on blackberry canes. 



ANTHRACNOSE 



Caused by Glceosporium venetum Speg. 



The anthracnose of blackberries is the same as that on rasp- 

 berries. The appearance of the disease on the various suscep- 

 tible parts is similar in both cases. The causal organism is also 

 the same. 



Recent investigations in Washington have shown that black- 

 berry-anthracnose can be profitably controlled by spraying. 

 Two applications are necessary : (1) spray just before the buds 

 open with bordeaux mixture 5-5-50 to which has been added 

 resin-fish-oil soap at the rate of one pound to fifty gallons of the 

 spray. The resin is valuable in rendering the spray more 



