PAPERS ON BIOLOGY AND AGRICULTURE 257 



Scab (Actinomyces scabies (Thax.) Gussow) was com- 

 mon over the state. 



Radish: Downey mildew (Peronospora parasitica 

 (Pers.) deBary.) was collected once. 



White rnst (Albugo Candida (Pers.) Rons.) occurred 

 occasionally. The first collection was made July 10 near 

 Carmi in "White county. 



Rhubarb: Crown and stalk rot (Phytopthora sp.) 

 was still severe in Union county. 



Leaf spot (Phyllocticta sp. and Cercospora (?) sp.) 

 were common in all localities but caused little if any loss. 



Sweet Potato: White rust (Albugo ipomoeae-pandu- 

 ranae (Schw.) Sw.) was generally distributed but less 

 abundant than usual. The first collection was made July 

 31 in Hardin county. 



Tomato: Blossom end rot (physiological) occurred 

 throughout the state and is estimated to have reduced 

 the crop by 1 per cent. 



Early blight (Macrosporium sp.) was generally distri- 

 buted over the state and was usually severe. It is esti- 

 mated to have resulted in a crop reduction of 4 per cent. 



Leaf spot (Septoria lycopersici Speg.) was prevalent, 

 but reduced the crop less than 1 per cent. 



Wilt (Fusarium lycopersici Sacc.) was abundant and 

 severe generally. It is the most serious disease the com- 

 mercial grower has to contend with. The crop reduction 

 is estimated at 10 per cent. 



Watermelon: Wilt (Fusarium vasinfectum Atk.) was 

 unusually serious. Its distribution was general. Many 

 fields were totally destroyed. The disease is estimated to 

 have caused a crop reduction of not less than 25 per cent 

 for the entire state. 



ORNAMENTAL AND MISCELLANEOUS PLANTS 



Carnation: Rust (Uromyces caryophillinus (Schw.) 

 Whit.) was generally distributed. The first collection 

 was made at Belleville, June 10. 



Evonymus: Powdery mildew (Microsphaera alni 

 (Wallr.) Salm.) was common late in the season, but did 

 not greatly injure the appearance of the shrub. 



