142 REPORT OF THE BOTANIST OF THE 
determined — the virulence of the disease would be increased by 
wet weather in April and May. 
Raspberry plantations have to be renewed frequently. After 
three to five crops have been harvested it is a common practice 
to dig out the plants and start a new plantation. As a rule, old 
plantations are unproductive, but just why this is so is not clear. 
With black caps renewal is often necessitated by the increasing 
virulence of anthracnose (Gloeosporium venetum) and red rust 
(Caeoma nitens). Our observations lead us to believe that cane 
blight is often partly responsible for the early decline in produc- 
tivity of both red and black raspberry plantations. 
Nearly all varieties of raspberries are more or less affected by 
cane blight, but some are more susceptible to attack than others. 
Of the varieties extensively grown, Cuthbert probably suffers 
most of all. Marlboro, too, is much subject to the disease. 
Ohio, Gregg and Kansas are much affected, while Columbian, 
although not entirely exempt, is notably resistant to the disease. 
In the Station plantation the varieties Superlative, I. X. L. and 
Pride of Geneva have shown themselves particularly liable to 
attack. The wild red raspberry, Rubus strigosus, is often 
attacked. 
Some of the canning factories complain that the supply of 
Cuthbert raspberries is not equal to the demand. Fruit growers 
explain this by saying that “the Cuthbert has such a tendency 
to dry up at fruiting time that it cannot be depended upon.” 
Consequently, many who formerly grew Cuthbert are now plant- 
ing Columbian, which is more productive but inferior in quality. 
We are of the opinion that this “tendency to dry up at fruiting 
time’ is largely due to attacks of cane blight. 
The cultivated dewberry is, perhaps, also affected by cane 
blight. At Portland, N.Y., in June, 1900, we saw canes of 
Lucretia dewberry wilting like raspberry canes attacked by cane 
blight, and at the base of the wilted portion a short section of 
cane was dead and covered with Coniothyrium as on raspberry 
canes. The resemblance to raspberry cane blight was so striking 
that we have not yet abandoned the idea that the raspberry 
Coniothyrium is parasitic on dewberry canes, although an inoc- 
