Currant Cane-blight 351 



the disease. The arsenate of lead not only serves as an insecticide 



but adds to the sticking qualities of the dust. 



References. 



Geneva, N. Y., Expt. Sta. Bull. 199. 



Cornell Univ. Expt. Sta. Bull. 358: 194 and Circular 32. 



CURRANT LEAF-SPOT 



Septoria Ribis, Desm. 



This leaf-spot is similar to anthracnose, but the spots are larger, 

 usually about an eighth of an inch in diameter, and more or less 

 irregular. They are clearly marked and brown about the borders, 

 with light-colored, grayish centers. As the spots grow old, several 

 minute black specks appear in these grayish centers. The spots of 

 anthracnose are dark-colored and often not larger than the head of 

 a pin. If the spots are numerous the leaf turns yellow and falls, as 

 with anthracnose. The two diseases are often found growing to- 

 gether. All varieties of currants and gooseberries are attacked but 

 some suffer more than others. The spores are spread in much the 

 same manner as are those of anthracnose and the same weather con- 

 ditions favor their development. It is thought to pass the winter 

 on the fallen leaves. The appearance of the two diseases is shown 

 in Plate XV. 



Control. Leaf-spot is controlled by the same means as anthracnose. 

 The treatment should be virtually the same whichever disease may be 

 present. Still another fungus, Cercospora, angulata, Wint., has been 

 reported on red and black currants growing with leaf -spot and yield- 

 ing to the same treatment. 

 References. 



Iowa Expt. Sta. Bulls. 13 and 17. 



Geneva, N. Y., Expt. Sta. Bull. 199. 



Cornell Univ. Expt. Sta. Bull. 358: 198. 



CURRANT CANE-BLIGHT 



Botryosphceria Ribis, Gross. & Dug. 



Much confusion has existed regarding the name of this disease, 

 because the fungus which produces it has three distinct spore-forms. 



