SMALL FRUITS 155 



produced in anthracnose are very much smaller, less 

 angular, and lack in every way the distinguishing charac- 

 ters of the other leaf spots. 



No conclusive evidence as to the best treatment is at 

 hand. The best recommendation is probably that of the 

 Geneva Experiment Station: "Spray thoroughl}^ with 

 Bordeaux mixture, commencing before the leaves appear. 

 Make the second treatment as the leaves are unfolding and 

 thereafter at intervals of ten to fourteen days until the 

 fruit is two thirds grown. In wet seasons make one or 

 two applications after the fruit is gathered. When worms 

 appear, add Paris green or green arsenoid to the Bordeaux." 



Rust (Puccinia Rihis DC). — The rust formed upon the 

 fruit and leaves of currants is rare in the United States. 

 It may be recognized by the sori characteristic of the rusts. 

 Diseased parts should be gathered and burned, and the 

 bushes and the ground beneath should be thoroughly 

 sprayed with a cleansing spray before the leaves appear. 



European rust (Cronartium Rihicola Fisch de Waldh.). — 

 This produces an orange-colored powder upon the lower 

 surface of the leaves. The spring stage occurs upon trunks 

 and branches of the white pine. The disease has been 

 rarely noted in America on plants introduced from Europe, 

 where it is quite common. 



Powdery mildew, sphaerothecose. See gooseberry. 



Root rot, dematophorose. See gooseberry. 



DEWBERRY 



Double blossom ^ {Fusarium Rubi Wint.). — Double blos- 

 som occurs on dewberry and, to some extent, on the 



1 Written for the authors by Mel. T. Cook. 



