Anthracnose 251 



varied, the one in most common use being Cceoma nitens. Its rela- 

 tionship to Puccinia Peckiana was supposed to be established inde- 

 pendently in Germany and in the United States some years ago. 

 Other more recent studies throw doubt upon this relationship and 

 suggest that it may belong to an entirely different genus. All this 

 is of interest to the botanist but does not concern the berry-grower. 



The appearance of this disease is well known, both on wild and 

 cultivated plants. The orange-red color of thenmder surface of the 

 infested leaves is due to the abundance of sori, which produce the 

 spores by means of which the disease may be spread from plant to 

 plant. These are connected in chains, and form a waxy layer over 

 the affected portions. The mycelium of the fungus, which corre- 

 sponds to the roots of higher plants, is perennial, living throughout 

 the winter in the canes and roots. A plant once attacked is therefore 

 doomed. Its vitality is sapped, and its condition is soon manifest 

 by the numerous small, weak canes which spring up. 



Treatment. Diseased plants should be rooted up and burned as 

 soon as discovered, to prevent the spore formation and consequent 

 spread of the disease. This, if promptly done, is a practical remedy. 

 Spraying can only help to prevent new infection. If employed 

 against the anthracnose, it will also be of use against red rust spores, 

 if they exist. 

 Reference. 



Clinton, 111., Expt. Sta. Bull. 29:273. 



ANTHRACNOSE 



~v 



Glceosporium Venetum, Speg. 



This disease is probably the most serious fungus, and perhaps 

 the most serious enemy, of raspberries and blackberries now known. 

 It is reported to have driven the growing of black-caps out of the 

 region west of Buffalo, New York, and is becoming abundant on 

 Columbian, the leading purple-cane variety. It is also a serious pest 

 in the Pacific Coast region. The fungus was first described by an 

 Italian botanist, M. Spegazzini, from leaves of the northern cloud- 

 berry, Rubus Chamcemorus. It was first mentioned in the United 



