New York AGRICULTURAL EXPERIMENT STATION. 137 
be occasionally found in the same stool. However, it is often 
difficult to determine whether a particular cane is or is not dis- 
eased because the transition from normal canes to badly diseased 
ones is by imperceptible gradations. [Except in the later stages 
of the disease and when also attacked by cane blight, the canes 
themselves do not show injury. The roots, too, appear normal 
but more observations must be made before it can be stated 
positively that the roots are entirely unaffected. 
This disease is a very important one and deserves more atten- 
tion from pathologists than it has yet received. Although espe- 
cially destructive to the Marlboro it is by no means confined to 
that variety. It has been observed on several other red varieties 
and black caps, among which are Coutant No. 1, Cuthbert and 
Kansas. 
The name yellows is given the disease, not because of any 
supposed relation to peach yellows, but because it is descriptive 
of the appearance of affected plants. The red rust of blackberries 
and raspberries, due to the fungus Ceoma nitens, is sometimes 
incorrectly called yellows. For this disease, red or orange rust is 
the proper name inasmuch as it is caused by a true rust fungus. 
The cause of raspberry yellows is not known. At one time we 
suspected that the red spider (Tetranychus telarius) was respon- 
sible for it, but that idea has been abandoned. It is safe to say 
that it is not caused by any fungus attacking the leaves. In an 
experiment made by this Station in codperation with W. D. Barns 
& Son, of Middle Hope, N. Y., various combinations of commercial] 
fertilizer were applied to the soil in a badly affected plantation 
without any appreciable effect on the disease. The details of this 
experiment will be given at a future time. 
No remedy or preventive is known. On this subject it can 
only be said that spraying with bordeaux mixture does not check 
the disease. During the seasons of 1901 and 1902 the Station 
conducted a raspberry spraying experiment in coédperation with 
Mr. J. A. Hepworth of Marlboro, N. Y. The plantation con- 
tained 12 rows, 304 feet long, of the variety Coutant No. 1. Six 
of the rows were not sprayed while the other six were sprayed 
with bordeaux mixture, 1-to-10 formula, on the following dates in 
