PAPERS OX BIOLOGY AND AGRICULTURE 147 



Leaf curl (Exoascus deformans) — Distribution general. Damage 

 slight if any. 



Scab (Cladosporium carpophylum) — Abundant generally on twigs. 

 Loss undeterminable. 



PLUM: 



Bacterial spot (Bacterium pruni) — Distribution general, but dam- 

 age slight. 



Pockets and leaf curl (Exoascus pruni and E. communis) — Local 

 distribution, resulting in leaf curl and deformed twigs. Damage none. 



Bhick knot (Plowrightia morbosa) — Distribution general. Loss 

 undetermined. 



CHERRY: 



Leaf spot (Coccomyces hiemalis) — Distribution general. Damage 

 undetermined. 



GRAPE: 



Black rot (Guignardia bidwelli) — Generally distributed. Found 

 in 959c of vineyards of the state, causing loss of approximately 209c 

 of the state's crop. The most serious grape disease. 



Doicney mildew (Plasmopara viticola> — Distribution general. Ap- 

 pearance late, with the wet weather of August and September. Dam- 

 age slight, mostly leaf injury. 



Pou-rlcry mildew (Uncinula necator) — Distribution general. Dam- 

 age slight if any. 



BLACKBERRY: 



Anthramose (Plectodiscella veneta) — Generally distributed. Loss 

 2 to 5% of the crop. 



Crown gall (Bacterium tumefaciens) — Present throughout the 

 state, injuring between 5 and 10<~f of the plants. 



Yello^ics (Physiological) — Distribution general, more severe north- 

 ward. Loss approximately 29^0 of the crop. 



CURRANT: 



Angular leaf spot — Distribution general, damage slight. 

 Anthracnose (Pseudopeziza ribis) — Distribution general, serious 

 only locally, causing defoliation. Damage slight. 



GOOSEBERRY: 



Anthracnose (Pseudopeziza ribis) — Serious locally, though gen- 

 erally distributed. Causing defoliation. Damage slight. 



STRAWBERRY: 



(Physiological) — Present in Champaign and Marshal counties. 

 Not important. 



Leaf spot (Mycosphaerella fragareae) — Distribution general, but 

 serious only locally. Total damage about 29^. 



Leaf scorch (Mollisia earliana) — Present in Champaign county and 

 serious on the Bederana variety. 



The cold wave, occurring over the entire state about 

 the middle of April, 1921, did a great deal of damage to 

 the fruit crop of the state. As a result, estimates of 

 damage which should be based upon yield could not. in 



