RASPBERRY DISEASES 403 



Cuthbert, Marlboro, Golden Queen, Early King and Herbert. 

 The St. Regis is resistant. Occasionally other red varieties 

 are affected. Often the Cuthbert and Marlboro are so injured 

 that they are discarded from commercial plantations. Where 

 the disease has wrought noticeable damage the original acreage 

 has been reduced to one-fifth within a period of eight years. 

 In such localities the annual loss is estimated at $200 per acre. 



Symptoms. 



The true raspberry-yellows (Fig. 118) has a striking and 

 characteristic appearance and should never be confused with 



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FIG. 118. Raspberry-yellows ; healthy plant on left, diseased on right. 



lack of thrift in plants due to cultural conditions, nor should it 

 be confounded with cane-blight. A withering or blighting 

 of canes or leaves does not occur in the case of yellows. In 

 general the disease does not appear until two years after plant- 

 ing ; sometimes three years may elapse before it really attracts 



