Fun GO ns Diseases of Cot.orado Crop Plants 
43 
Plate XV. Fig. 2. Sclerotia of Rhizoctonia on seed potato. Fig. 3. The fine cracks seen 
on surface of potato are caused b:/’ the attacks of Rhizoctonia. 
RADISPI 
White Rust. —The white “rust” occurs not only on radish, 
but on other members of the mustard* family, such as horseradish, 
turnip, and cabbage. It commonly affects leaves, but is also found 
on flower parts, distorting them to a marked degree. On the leaves 
the spore cushions are white and shining, and vary in size from 
mere specks to irregular patches an inch or more in diameter. 
No serious injury has resulted from the attacks of this dis¬ 
ease, as far as reports indicate. 
RASPBERRY. 
Anthracnose.-t- Young canes are chieilly attacked, although 
the disease may also appear on leaf and leaf-stalk. The spots on 
the canes are at first small and purplish, later they develop gray. 
