168 MANUAL OF FRUIT DISEASES 
As arule the disease is not of sufficient importance to warrant 
spraying for its control. 
YELLow Late-Rust 
Caused by Kuehneola albida (Kuehn) P. Magn. 
This is a disease peculiar to wild and cultivated blackberries. 
It is found in Europe and in eastern North America. In the 
northern United States where it occurs there is no need for 
alarm on account of its late fall appearance. However, it may 
assume a more important réle south of New York State. 
Symptoms. 
Plants in sandy soil are said to be more affected. Rust 
pustules are produced on the canes the last of May or in June, 
or about blossoming time. These are bright, lemon-yellow 
in color, and measure from one-eighth to one-half an inch in 
diameter. They are usually found on the stem near the ground. 
Later the leaves are affected, the disease first appearing on the 
lower surface of the leaves of fruiting canes, then on those leaves 
attached to the new canes. The fruit-stalks and flowers are 
also rusted. 
The general appearance of the disease has given rise to the 
names yellow late-rust, white-rust, cane-rust and late-rust. 
Little is known of the seasonal cycle of the causal fungus, 
Kuehneola albida, and of its control. 
REFERENCES 
Stewart, F. C., Rolfs, F. M., and Hall, F.H. A fruit-disease survey of 
western New York in 1900. Blackberry diseases. Yellow fall 
rust. New York (Geneva) Agr. Exp. Sta. Bul. 191 : 306-307. 1900. 
Wilson, G. W. Rusts of blackberries, dewberries, and raspberries. 
Late rust. Cane rust. North Carolina Agr. Exp. Sta. Rept. 35: 
58-61. 1912. 
Stone, G. E., and Smith, R. E. A late rust of the blackberry (Chry- 
somyxa albida, Kiihn). Massachusetts (Hatch) Agr. Exp. Sta. 
Rept. 9:74. 1897. 
