jS'kav York Agricultural Experiment Station. 135 



HOST PLANTS. 



While Gloeosporium ribls may attack several dififerent species 

 of Rihes, it has a decided preference for R. ruhrum to which 

 belong the red and white varieties of cultivated currants. It 

 has been frequently reported on R. nigrum, the black currant, 

 but according to our observations it is not at all destructive to 

 black currants, to say the least. While watching the progress 

 of the disease in the Hudson Valley we examined several plan- 

 tations of black currants, but in no case found any damage done 

 to them by anthracnose. In one case a row of black currants 

 stood between two rows of red ones. The red currants were all 

 severely attacked by anthracnose, but the foliage of the black 

 currants was perfect and apparently free from the disease. 



The cultivated gooseberry, Ribes grossularice, is also said to be 

 subject to anthracnose. In the region where anthracnose was 

 epidemic on currants there are several commercial plantations 

 of gooseberries none of which were affected by the disease to 

 anv extent. 



ft/ 



It also appears that among the red currants some varieties are 

 somewhat more susceptible than others. Our observations on 

 this point are not as full as they should be and so we are unable 

 to give a list of resistant varieties; but it is probable that this 

 difference in susceptibility is sufficiently great to be turned to 

 I>ractical account in case anthracnose should become an im- 

 portant factor in currant culture. 



On July 23, when the disease w^as in full sway, we made some 

 observations at Middle Hope where four varieties of red currant, 

 Fay Prolific, Victoria, Prince Albert and Pres. Wilder, were 

 growing in the same plantation under practically the same con- 

 ditions. On Fay Prolific, anthracnose had caused about two- 

 thirds of the foliage to drop and Victoria had lost about one- 

 third of its foliage; while Prince Albert and Pres. Wilder were 

 perfect in foliage and practically free from the disease. Goose- 

 berries growing nearby were also unaffected. 



