188 ReECORT OF THE. BOTANIST OF THB 
Crown gall is quite common on cherry trees in the nursery. 
We have not taken a single specimen of scab, Cladosporium 
carpophilum, or of rust, Puccinia pruni. 
CURRANT DISEASES, 
Canp Buicut.—This disease is of frequent occurrence in the 
currant plantations in Western New York, but not nearly so 
destructive there as it is in the Hudson Valley. In Western 
New York the fungus Nectria cinnabarina is commonly associated 
with the disease although we have also sometimes found the 
sterile fungus which is the chief cause of the currant cane blight 
in the Hudson Valley. We observe that in Western New York 
the disease generally attacks the plants near the surface of the 
ground, making it difficult to apply successfully the preventive 
measure of pruning out the affected branches as has been sug- 
gested*4 for the Hudson Valley. 
Lear Spot.—We have observed three kinds of currant leaf 
spot; viz., leaf spot caused by Septoria ribis, by Glaosporium ribis 
and by the four-lined leaf-bug. The Septoria leaf spot has been 
the most common, but it has not done much damage. 
PowveEery Miutppw (Spherotheca mors-uve (Schw.) B. & C.).— 
The powdery mildew of the gooseberry sometimes attacks cur- 
rants. At Ripley, Chautauqua County, we saw this mildew in 
two plantations of currants. In one case the plants were 
unusually thrifty and growing in a plum orchard. On many 
plants the mildew attacked the leaves at the ends of the canes, 
and on a few plants it also attacked the berries, covering them 
with a brown felt-like growth. 
GOOSEBERRY DISEASES. 
Powprery Minpew (Spherotheca mors-uve (Schw.) B. & C.).— 
The only important disease affecting gooseberries in 1900 was 
powdery mildew, which, as usual, caused much damage. In 
many instances the entire crop of certain varieties was ruined by 
it. The English varieties suffer most, but some American varie 
ties are also subject to it. 
*% Bul. 167 this Station, p. 294. 

