124 REPORT OF THE BOTANIST OF THE 
Coniothyrium pycnidia could be detected. These ten canes are 
shown in Plate VIII. 
On the same date one of the check canes was found to have 
been killed by a borer, but the other four were alive clear to the 
top. The only thing abnormal about them was a slight dis- 
coloration of the outer layer of bark under the wax. In no case 
was the wood discolored and no Coniothyrium was found. 
Remarks.—Experiment No. 5 was conducted at Highland, N. Y.; 
Nos. 6 and 7 at Milton, N. Y.; and all of the others on the 
Station farm at Geneva. Nos. 8, 9 and 11 are the most trust- 
worthy because they were conducted in a small, isolated planta- 
tion which was, apparently, entirely unaffected by cane blight. 
Also, the inoculations were made with especial care. 
Interpretation of the results— These experiments prove con- 
clusively that the raspberry Coniothyrium is parasitic on rasp- 
berry canes (both black and red varieties) and the cause of cane 
blight. It will attack new canes as well as fruiting canes, but 
seems somewhat more active on the latter. Although the ex- 
periments on blackberry and dewherry gave negative results it 
should not be considered proven that the fungus is incapable 
of attacking these plants, for the reason that there was but a 
Single experiment in each case. 
Both old and new canes may be expected to succumb to the 
disease within two months after inoculation, and Coniothyrim 
pycnidia with mature spores may be produced in abundance dur- 
ing the same period. 
TIME AND MANNER OF NATURAL INFECTION. 
Although new canes are rarely killed by cane blight during the 
first season of their growth this does occasionally happen, and 
there is also other evidence to show that infection occurs on new 
canes. On August 28, 1901, the writers observed a stool of black 
raspberry in which several of the new canes were wilting and 
dying. Upon examination it was found that at the very base of 
the dying canes the bark and wood were dead and brown and 
bearing Coniothyrium pycnidia. This occurred on the Station 
grounds at Geneva and appeared to be a case in which cane blight 
