CHAPTER XIV 

 RASPBERRY DISEASES 



NOT infrequently raspberry diseases have been factors in 

 driving the bush-fruit growers out of the business. Crown- 

 gall is very destructive to raspberries, although its injury to 

 trees like the apple and peach is questioned. Orange rust is 

 very damaging to black-caps, and yellows is extremely common 

 everywhere. Anthracnose, cane-blight and root-rot are trouble- 

 some in many localities where this fruit is grown. 



CROWN-GALL 

 Caused by Bacterium tumefaciens E. F. Smith and Townsend 



Note should be taken of the fact that crown-gall occurs on a 

 great variety of plants (see list on page 112). In certain states, 

 for example New York, the trouble affects the raspberry more 

 commonly than any other plant. It is also more destructive 

 to the raspberry, in many cases, than to the apple, peach, grape 

 or other fruits. While no variety appears immune, the disease 

 is particularly common and important on the red varieties like 

 the Cuthbert and London. It is said to cause considerable 

 damage in the State of Washington ; and records of it come from 

 several other states indicating its wide geographical range in 

 the United States. It was observed in Ohio as early as 1894. 



A more detailed discussion of crown-gall will be found under 

 Apple, page 108. 



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