188 Eeport of the Botanist of the 



Crown gall is (jnite common on cherry trees in the nursery. 

 We have not taken a single specimen of scab, Cladosporium 

 carpophiliim, or of rust, Piiccinia pnini. 



CURRANT DISEASES. 



Caxe Blight. — 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 Ncctria cinnctbarina 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 ^^ for the Hudson Valley. 



Leap Spot. — We have observed three kinds of currant leaf 

 spot; viz., leaf spot caused by Septorla ribls, by Gloeospor'mm ribis 

 and by the four-lined leaf-bug. The Septoria leaf spot has been 

 the most common, but it has not done much damage. 



Powdery Mildew {Sphwrotheca mors-iivcB (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 w^ere 

 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 ateo attacked the berries, covering them 

 with a brown felt-like growth. 



GOOSEBERRY DISEASES. 



Powdery Mildew [Sphrerotheca mors-uvcc (Schw.) B. & C). — 

 The only important disease aflfecting 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 Amerioaa varie- 

 ties are also subject to it. 



" Bui, 1G7 this StatioD. p. 294. 



