460 Report oF THE HorTICULTURIST OF THE 
a disease of the canes it may occur on any part of the plant above 
ground. It is most destructive to black raspberries, but also 
attacks purple raspberries and blackberries and perhaps still 
other species of Rubus. Red raspberries appear to be exempt. 
Treatment.”°— Since, in most instances, a raspberry plantation 
reaches its limit of profitable production when three or four years 
old it seems that a rotation of crops, combined with sanitary 
measures, is the surest method of preventing loss from this disease. 
As the disease lives over winter in the canes, the old canes, to- 
gether with the badly diseased new ones, should be removed as 
soon as the fruiting season is over. 
Experiments have shown that the disease may be checked by 
spraying with Bordeaux mixture, beginning when the new canes 
are about six inches high and keeping them well protected with 
the mixture until the fruit is two-thirds grown. Ordinarily, how- 
ever, spraying for anthracnose is not likely to pay. 
RUST. 
(Puccinia peckiana Howe. Syn. Caeoma nitens Schw.) 
Description, etc.— This disease is often called the orange rust 
on account of the orange color of the spores which are produced 
in dense masses on the underside of the rusted leaves. Sometimes 
the spore masses occur also on the canes. The fungus attacks 
blackberries, dewberries and raspberries. It is quite common on 
wild plants and where these are growing*in the vicinity of cul- 
tivated varieties the diseased plants among them should be de- 
stroyed to prevent them from becoming a source of infection. 
Treatment.— Clinton® states that the fungus enters the very 
young underground shoots and growing up through the canes 
finally appears in the leaves. Since the fungus grows within the 
canes and infection appears to take place at the root, the only 
50 Paddock, W. The Anthracnose of Black Raspberry. N. Y. Agr. Exp. 
Sta. Bul. 124. 
51 Clinton, G. P. Orange Rust of Raspberry and Blackberry. Ill. Agr. Exp. 
Sta. Bul. 29. 

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