154 



DISEASES OF ECONOMIC PLANTS 



In a severe outbreak which is necessary to attract atten- 

 tion to the disease the leaves first become covered with 

 small dark brown spots, change to yellow, and soon fall. 

 By the time the fruit has ripened practically all of the 



Fig. 66. — Anthr^icnoso of white currants. After Clinton. 



leaves may be lost. Upon the leaf stalks, also upon the fruit, 

 stems, and canes, the disease appears as little black sunken 

 spots. On theberries the spots are circular and black, much 

 resembling fly specks. The causal fungus probablj^ winters 

 upon the canes, ready to initiate the spring infection. 



Anthracnose can readily be distinguished from the two 

 leaf spots mentioned above by the fact that the spots 



