New York AciticuLTURAL Expekijment Station. 195 



berries of the variety Wilson Jr., the rust-affected canes were 

 almost or even wholly destitute of prickles. It is not an uncom- 

 mon thing to find healthy canes and rusted canes of blackberry in 

 the same hill.^^ Such cases offered an opportunity for close com- 

 parison and it was found that the difference in the number of 

 prickles on the two sorts of canes in the same hill was very marked. 

 (See Plate XY.) The difference is so great that Mr. E. W. Barns 

 says he can pick out the diseased canes in winter by their freedom 

 from prickles. On affected raspberry canes the reduction of 

 prickles was very evident but not so marked as with the black- 

 berry. 



After these observations at Middle Hope, we examined, during 

 the season, many rusty blackbeiTies, raspberries and wild dew- 

 berries (Buhus canadensis L.) in various localities. With all of 

 these plants we found that rust in some cases caused a great re- 

 duction of prickles; in other cases, partial reduction; and in still 

 others, no reduction at all. At Yorkto^vn badly rusted blackberries 

 of the variety Minnewaska were observed which showed no ap- 

 parent reduction of prickles. 



LEAF SPOT. 



(Septoria ruhi Westd.) 

 Rare. Observed only at Pough<keepsie. 



CHERRY DISEASES. 



FRUIT ROT. 



(Monilia fructigena P.) 



As usual, fruit rot has been the worst cheny disease, but was not 

 pearly so destructive as in 1898. From Westchester Co. it is 

 reported "■ bad on some varieties." In Rockland Co. it destroyed 



13 This has also been observed by Clinton ; Orange Rust of Raspberry and 

 Blaekberry. 111. Agr. Exp. Sta. Bui. 29: 276. D. 1893. It occurs less com- 

 monly with the raspberry, probably on account of the more compact habit of 

 jjrowth at the crown. 



