This leaf disease of currants is common in Iowa and New York. It is also found in Ohio, Michigan, West Virginia, Maryland, Nebraska, Wisconsin and Rhode Island. In some years it is very destructive.
The spots produced by Cercospora angulata are readily recognized. On the upper surface of a leaf the spots are of a paler color than the surrounding healthy tissue. The under surface of the diseased portion is smoky in color. The lesions are roundish or angular, and measure from one-sixteenth to one-eighth of an inch in diameter. Little attention has been given to the life - history of the pathogene.
The disease may be controlled by the schedule advised for the Mycosphaerella Leaf Spot (see page 205).
Pammel, L. H. Spot diseases of currants and gooseberries. Iowa Agr. Exp. Sta. Bul. 13: 67 - 70. 1891. Pammel, L. H. Treatment of currants and cherries to prevent spot diseases. Experiments with currant spot diseases. Iowa Agr.
Exp. Sta. Bul. 30: 289 - 291. 1895.