'Nbw York Ageicultukal Experiment Station. 205 



small. The owner states that in 1898 there had been many plants 

 so affected. The affected plants were intermingled with healthy 

 ones. 



GRAPE DISEASES. 



BLACK EOT. 



(Laestadia hidwellii (Ell.) Viala & Ravaz.) 



Black rot has been, as usual, the worst grape disease, but was 

 ifiot nearly so destructive as in 1898. The worst case we have 

 seen or heard of this year occurred at West ISTyack, Rockland 

 County, where 75 per ct. of the crop was ruined by it. In some 

 vineyards in Westchester County, it is reported to have caused a 

 loss of 50 per ct. From various other localities it is reported 

 destructive in un sprayed vineyards. 



Bordeaux mixture, properly applied, is an almost certain pre- 

 ventive of this disease. It should be more generally used in the 

 Hudson Valley. 



DOWNY MILDEW. 



(Plasmopara viticola (B. & C.) Berl. & De Toni.) 

 This disease appears to have been scarce except in the southern 

 part of the district where it was destructive in a few vineyards. 

 At West ISTyack it was severe on several varieties, but showed a 

 decided preference for the variety Delaware. 



ROOT EOT. 



(Dematophora 7iecatrix (?) Hartig.) 

 While on a visit to Middle Hope we were informed that in a 

 vineyard near that place gTape vines had been killed by a black 

 walnut tree. We visited the vineyard and found that the tree, 

 which was of enormous size, stood about 40 feet from the edge 

 of the vineyard. Opposite the tree all of the vines over a small 

 semi-circular area had died. The owner stated that peach trees 

 had been planted in the vacant area but they, too, had died. 

 We dug up some of the dead vines and found the roots covered 



