250 ILLINOIS STATE ACADEMY OF SCIENCE 



covered with a pinkish cushion of mycelium which bears 

 the spores in abundance. 



Clover: Powdery mildew (Erysiphe polygoni DC.) ap- 

 peared over the entire state in great abundance. Prob- 

 ably the mild winter allowed a considerable quantity of 

 infectious material to live over from the epidemic of the 

 previous fall, and certainly the spring weather was con- 

 ducive to its early and general development. Although 

 considerable apprehension was apparent among farmers 

 lest the presence of the mildew might materially damage 

 the crop or impair its value for feeding purposes, there 

 was little loss to be attributed to the disease. 



Rust (Uromyces trifolii (Hedw.) Lev.) was not of 

 frequent occurrence. It was observed chiefly in the north- 

 ern half of the state, and caused no appreciable loss. 



Cow Pea: Leaf spot (Cercospora cruenta Sacc.) was 

 found in the state for the first time, near Makanda in 

 Jackson county. The increased planting of cow peas, soy 

 beans and other leguminosaeous crops within the state 

 furnishes an economic importance for many diseases 

 hitherto regarded as important merely from a mycologi- 

 cal standpoint. 



Siveet Clover: Anthracnose (Colletotrichum trifolii 

 Bain) was reported generally from the northern part of 

 the state, but appears to have been serious only locally. 

 No appreciable loss can be attributed to it. 



Anthracnose (Gloeosporium caulivorum Kirch.) was 

 reported from Kankakee county, but was not severe. 



FRUIT CEOPS 



Apple: Bitter rot (Glomerella cingulata (Stonem.) 

 S. & v. S.) was of little importance. It was found once 

 in Saline, once in Massac, and once in Pulaski county. 

 The earliest date of appearance reported was at Stone- 

 fort, July 22. 



Black rot (Physalospora cydoniae, Arn.) was some- 

 what less abundant than usual. A crop reduction of 2 

 per cent may be attributed to it. 



Blister canker (Nummularia discreta Tul.) appears to 

 be increasing in abundance and occurs throughout the 



