SMALL FRUITS 177 



ately injurious from year to year, weakening the plants and 

 diminishing the yield. 



In locahties subject to this disease it is best to rotate 

 crops so as to avoid keeping raspberries more than three 

 years on the same soil. When the disease appears, cut out 

 and burn diseased parts immediatel}'^ after picking. Spray- 

 ing young canes with a protective (Bordeaux) spray the 

 following spring will lessen infection. Whether the spray- 

 ing is of enough benefit to warrant its use is questionable.' 

 If spraj'ing is done, it should be begun when the new canes 

 are about 15 cm. high, and one or two more sprayings 

 given at intervals of 10 or 14 days thereafter. 



Crown gall (Pseudomonas tumefaciens Smith & Town- 

 send). — Frequently small swellings are noticed on the 

 roots of the raspberry in abundance enough to injure the 

 health of the plant. These galls very closely resemble 

 the crown gall of the peach, almond, apple, etc., which has 

 recently been attributed to a species of Pseudomonas. It 

 is desirable to pull up and destroy diseased plants and avoid 

 placing blackberries and raspberries on ground which is 

 known to be affected. 



Leaf spot, septoriose. See blackberry. 



Rust, gjrmnoconiose. See blackberry. 



Cane blight (Coniothyrium Fuckelii Sacc). — First 

 noticed in literature in 1899 by Stewart and Eustace ^ as 

 occurring in the Hudson valley, this disease seems to be 

 widespread and destructive upon both red and black rasp- 



' Paddock, W., N.Y. (Geneva) Agr. Exp. Sta. Bui. 124, p. 273, April, 

 1897. 



2 Stewart, F. C, and Eustace, H. J., N.Y. (Geneva) Agr. Exp. Sta. 

 Bui. 226, December, 1902. 



N 



