New Yorx AgricutturaAL 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 ROT. 
(Laestadia bidwellw (EIl.) Viala & Ravaz.) 
Black rot has been, as usual, the worst grape disease, but was 
mot nearly so destructive as in 1898. The worst case we have 
seen or heard of this year occurred at West Nyack, 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 unsprayed 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.) Beri. & 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 Nyack it was severe on several varieties, but showed a 
decided preference for the variety Delaware. 
ROOT ROT. 
(Dematophora necatrix (¢) Hartig.) 
While on a visit to Middle Hope we ‘were informed that in a 
vineyard near that place grape 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 
