45 
To properly spray a vinejard for black rot will require about 
seventy-five gallons of Bordeaux mixture per acre at each applica- 
tion. The entire cost of spraj'ing a vineyard is estimated not to ex- 
ceed |6.U0 per acre. If such an expenditure can save a quarter to a 
half of a crop, then certainly it is a good business proposition to 
spray grapes to protect them against the attack of black rot. 
The results of careful spraying for black rot in Erie county are 
reported in Bulletin Xo. GO, of the Experiment Station, State Col- 
lege, Pa. 
While all varieties of the grape are subject to the attack of black 
rot, it does not affect all with equal severity. The most susceptible 
varieties are Concord, Catawba, Salem, Lindley and Barry. The 
light-colored varieties are least subject to attack. Warm, wet 
weather favors the disease. 
ANTHRACNOSE. 
(Sjyhaceloma ampelinum.) 
This is a comparatively new disease in America. It has been 
known in European vineyards under various common names as 
Charbon, Schwarze Brenner and Anthracnose. The last name is de- 
rived from the Greek and means coal-disease. In this country it 
has also received the name of "bird's-eye rot/' owing to a striking 
resemblance of a diseased spot on a berry to a bird's eye. This 
disease has been more destructive to grapes in Pennsylvania than 
the black rot up to this time. It attacks the fruit, the leaves 
and the shoots. 
Symptoms of Anthracnose. — The greatest amount of damage oc- 
casioned by this disease is upon the berry. Small dark brown or 
black spots appear on the surface of the green berry, and soon the 
center of the spot sinks. The spot grows larger and the sunken 
center becomes ashen-gray; the margin of the spot becomes purple, 
and the appearance of these three colors, purple, brown and gray 
in concentric rings, suggest the name of "bird's-eye rot." The entire 
grape does not speedily become involved, as in the case of black rot, 
unless the berry is attacked simultaneously at several points; 
neither does the berry shrivel up in the later stages of this disease 
as it does in the case of black rot. 
Upon the shoots and leaves the same symptoms appear except 
that the purple margin is not commonly present, and the spot is 
not so likely to be circular, but rather eliptical, elongating in the 
direction of the stem. The diseased spots become black and look 
as if burned. Such spots on the canes are very noticeable when 
pruning the vines and it is very evident that the health of the vine 
is seriously injured. 
