256 ILLINOIS STATE ACADEMY OF SCIENCE 



Rust (Uromyces appendiculatus (Pers.) Lev.) was 

 more abundant than usual, and was reported to be severe 

 in some localities in the south. The first collection was 

 made July 27 near Parker in Johnson county. 



Beet: Leaf spot (Cercospora beticola Sacc.) occurred 

 in almost every garden in the state. There was no ap- 

 parent loss. 



Cabbage: Black rot (Pseudomonas campestris 

 (Pam.) E. F. S.) was serious in some localities and is 

 estimated to have reduced the crop of the state by 1 per 

 cent. 



Yellows (Fusarium conglutinans Woll.) still continues 

 to be the limiting factor in cabbage production. It is es- 

 timated to have caused a crop reduction of 5 per cent. 

 Seed of resistant varieties is not commonly used. The 

 chief method of control now practiced consists in a sys- 

 tematic change of crops on infected soil. 



Cantaloupe: Bacterial wilt (Bacillus' trachiephillus 

 E. F. S.) was more serious than usual. In the Poag Sta- 

 tion melon district in Madison county the infection was 

 particularly bad. 



Celery: Late blight (Septoria apii (Br. & Cav.) 

 Chest.) was not common, but caused severe loss where 

 the Skinner system of overhead irrigation was practiced. 



Lettuce: Leaf spot (Septoria lactucae Pass.) was of 

 some importance throughout the state. The earliest re- 

 ported occurrence was June 30 in Wayne county. 



Pea: Powdery mildew (Erysiphe communis Wallr.) 

 was destructive on the late maturing varieties. Collec- 

 tions were made of this disease in five counties, the ear- 

 liest of which was near Ryder in Jefferson county, June 

 23. 



Pepper: Fruit rot (Alternaria sp.) was collected 

 near Charleston in Coles county, August 28. 



Potato: Early blight (Alternaria solani (E. & M.) 

 J. & Cr.) was general and is estimated to have damaged 

 the plants to an extent equivalent to a crop reduction of 

 1 per cent. 



Rhizoctonia disease (Corticium vagum Burt.) was 

 found once only. It was collected June 23 near Ryder 

 in Jefferson county. 



