Culture of Raspberries 



1707 



the shoots grow the blotches become larger and grayish in the center, and 

 by the end of the season may encircle the cane and practically girdle it. 

 This disease is very destructive to black raspberries, but not often injurious 

 to the red varieties. 



Control. — Eradication is the best method of control. All the old canes, 

 and the new ones that are badly diseased, should be cut out and burned 

 as soon as the fruit is gathered. Applications of bordeaux, 5-5-50, will 

 control the malady but this treatment may not be profitable. If spray- 

 ing seems advisable the first application should be made when the new 



Fig. 73. — Cane, affected with an hracnose. Note pitted or sunken areas 



canes are six to eight inches high. The second and third applications 

 should be made at intervals of ten to fourteen days.* 



The grower should be careful to plant new patches where the disease is 

 not prevalent. The departments of Pomology and Plant Pathology of 

 the New York State College of Agriculture at Cornell University are now 

 studying cooperatively different spraying mixtures for controlling this 

 disease. 



Cane-blight, or -wilt 



This disease affects both red and black varieties. It is caused by a 

 fungus that attacks the cane at some point and kills the bark and 

 wood. That part of the fruit cane above the diseased portion suddenly 



*Xew York (Geneva) Agricultural Experiment Station Bulletin 124. 



