Circular no. 747 



July 1946 • Washington, D. C. 



UNITED STATES DEPARTMENT OF AGRICULTURE 



Distinguishing Characteristics of Some 



Forage-Grass Diseases Prevalent in 



the North Central States : 



By J. Lewis Allison, associate -pathologist, Division of Forage Crops and Diseases, 

 Bureau of Plant Industry, Soils, and Agricultural Engineering, Agricultural 

 Research Administration, United States Department of Agriculture, and assistant 

 professor of plant pathology, University of Wisconsin, and Donald W. Chamber- 

 lain, 2 formerly research assistant, Department of Plant Pathology, University 



of Wisconsin 



CONTENTS 



Diseases of perennial grasses 



Kentucky bluegrass 



Powdery mildew 



Rusts 



Stripe smut 



Leaf spot 



Smooth bromegrass 



Bacterial blight (chocolate 



spot) 



Brown spot 



Leaf spot 



Scald 



Ergot 



Other grasses 



Brown stripe 



Page 

 2 

 2 

 2 

 3 

 4 

 5 

 6 



grasses- 



Diseases of perenni 

 Continued. 

 Other grasses — Continued 

 Net blotch '_ 



Diseases of annual grasses. _ 



Sudan grass 



Bacterial spot 



Bacterial stripe 



Leaf blight 



Anthracnose 



Nonparasitic foliage dis 

 orders 



Control measures 



Literature cited 



Page 



11 

 12 

 12 

 12 

 12 

 13 

 14 



14 

 15 

 16 



PASTURE and forage grasses have become increasingly important 

 in the grassland agriculture of the United States, but for years 

 little other than mycological attention has been given to the diseases 

 known to attack grasses. The advent of grass-improvement investi- 

 gations, however, brought recognition that grasses, like most economic 



1 Cooperative investigations of the Division of Forage Crops and Diseases, 

 Bureau of Plant Industry, Soils, and Agricultural Engineering, Agricultural 

 Research Administration, U. S. Department of Agriculture, and the 'Wisconsin 

 Agricultural Experiment Station. 



2 Now assistant in forage-crop investigations, Kentucky Agricultural Experi- 

 ment Station, Lexington. 



675159°-46 



