90 ILLINOIS STATE ACADEMY OF SCIENCE 



Plums suffered most severely from Brown Rot, which 

 was most severe in the northern half of the state. Black 

 Knot was prevalent in the southern half. Leaf Blight 

 was more severe southward and was second only to brown 

 rot in severity. A Leaf Curl of red plums, caused by 

 Exoascus mirabllis Atk., was found in six counties. This 

 disease appears to be increasing in abundance. 



On Cherries, Brown Rot was especially abundant south- 

 ward while Powdery Mildew was generally prevalent in 

 central Illinois. Shot Hole was responsible for serious 

 defoliation locally southward. 



Grapes suffered to a greater degree than usual from 

 Black Rot, and Bitter Rot was an important disease in 

 Madison county. Downy Mildew was much worse than 

 usual in the Mississippi and Illinois valleys, but Powdery 

 Mildew was not reported. 



Leaf Blight and Leaf Spot were both more prevalent 

 than usual on Strawberries, and a root rot of unknown 

 cause was prevalent throughout central Illinois, causing 

 serious losses among the plants. Orange Rust appeared 

 on Blackberries more commonly than usual and Cane 

 Blight was serious in some commercial plantings on both 

 Blackberries and Raspberries. Currants and Gooseber- 

 ries suffered to some extent from Leaf Spot and the gen- 

 eral attack of Gooseberry Anthracnose was serious local- 

 ly in central Illinois. 



DISEASES OF CEREAL CROPS 



Leaf Rust of Wheat, usually the most important dis- 

 ease, was held in check by the low temperatures of early 

 spring. The slow development of the crop, however, gave 

 rise to the most general Stem-Rust infection in years. 

 Loose Smut was less abundant than usual, while Stink- 

 ing Smut became the most important source of loss, caus- 

 ing a crop reduction estimated at 6.4 per cent and a cash 

 dockage in marketing the crop of more than $100,000. 



The range of Flag Smut infestation was extended from 

 the neighborhood of East St. Louis to include parts of 

 nine counties, of which Hancock and Logan counties are 

 the farthest north. Scab was unusually prevalent 

 throughout the state. Anthracnose appeared for the first 



