Kew York Agricultural Expbrimext Station. 129 



July 23, when it appeared in abundance and destroyed the few 

 leaves left by anthracnose. 



Another form of so-called leaf spot which occurs on currant 

 leaves in the Hudson Valley, sometimes in considerable abun- 

 dance is that caused by the four-lined leaf-bug, Pcecilocapsus 

 Uneatus} The spots caused by this insect are angular and trans- 

 lucent or else black with a water-logged appearance. (See Plate 

 I, Fig. 4). They are wholly different in appearance from 

 anthracnose spots and, moreover, they occur on leaves at the 

 tips of the canes; whereas, anthracnose appears first on the 

 lower leaves and may attack leaves on any part of the plant. 



A third leaf disease of currants is one which may be called 

 leaf blight. It is caused by the fungus Cercospora anr/ulata 

 Wint. According to PammeP this fungus is common on cur- 

 rants in Iowa. 



In New York State it seems to be rare. In 1S07 we received 

 specimens of it from Highland, and in 1900 specimens were sent 

 us from Long Island. During the past season we have sought 

 for it in the Hudson Valley, but have not found even a trace of 

 it. The spots formed by it are considerably larger than anthrac- 

 nc« spots. 



O asionally we have met with a form of leaf spot caused by 

 a sp* cies of Phijllosticta. The spots are larger even than those 

 of Sfeptwia rihis so there need be no danger of confusing them 

 with anthracnose spots. 



THE FUNGUS. 



Glocosporiiim rihis (Lib.) Mont. & Desm. 



The fungus which is the cause of currant anthracnose was 

 named Gloeosporium rihis by Montague and Desmazieres^ in 1867. 

 For some time previous it had been known as Lcptothi/rium rihis, 

 which name is, therefore, a synonym. Cnjptosporium ribls Fckl. 

 is also a synonym. 



As already stated, it attacks the leaves, petioles, fruit stems, 



'See Bui. 167 of this Station, p. 291: also Cornell Agr. Exp. Sta. Bui. 58. 



* rammel, L. H. Iowa Exp. Sta. Bui. 13.07. 



"Montague & Desmazieres. Kickx' Flore crypt. Flandres 2:95. 



9 



