New York AGRICULTURAL EXPERIMENT STATION. 135 
soil, but how long is not known. After a severe attack of cane 
blight the land should not be replanted with raspberries for at 
least three years. 

Removal of old canes.— Immediately after the fruit is gath- 
ered, cut out and burn the old canes. The old canes harbor 
the fungus. They are covered with multitudes of Coniothyrium 
spores and if allowed to remain standing in the plantation until 
winter they must be an important source of infection to the new 
canes. It is too much to expect that by prompt removal of the old 
canes cane blight can be entirely controlled, because under favor- 
able weather conditions.it is likely that considerable infection of 
the new canes may occur before the fruit is ripe. However, the 
virulence of the disease may be lessened in this way. 
Spraying.-— Judging from the results of experiments thus far 
made spraying is not a promising line of treatment; and yet, 
theoretically, the disease should be preventable by spraying. The 
chief difficulty seems to be to get the spray mixture to adhere to 
the canes. The new canes are covered with a “bloom” which — 
causes the spray mixture to gather in drops and roll off. If 
spraying is done it should be commenced when the new canes 
are a few inches high and repeated at intervals of two weeks until 
about the middle of September, and again the following spring 
from the bursting of the buds to the setting of the fruit. In 
order to avoid spotting of the fruit and possible injury to the 
blossoms it may be necessary to abandon the spraying for about 
six weeks at fruiting time. It should be remembered that it is 
the canes and not the leaves which need protection. Bordeaux 
mixture is as likely to give good results as any other fungicide. 
Other suggestions.— In setting plants suspected of being in- 
fected with cane blight remove as much as possible of the old 
cane and wash the roots. Destroy wild raspberry plants in the 
immediate vicinity of the plantation, since they may be a source 
of infection. 
Some varieties are more resistant to cane blight than others 
and perhaps this fact may be turned to practical account. It is 
not now possible to give a list showing the relative susceptibility 
of different varieties; but it can be stated that among the varieties 
