CHARACTERISTICS OF SOME FORAGE-GRASS DISEASES 



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Figure 16. — Nonparasitic foliage disorders on Sudan grass. 



CONTROL MEASURES 



The grass diseases reviewed in this circular are not effectively con- 

 trolled by the accepted regular control methods of sanitation, crop 

 rotation, or use of chemicals. Sanitation and crop rotation are both 

 impractical because most of the diseases attack more than one species, 

 many of which are noneconomic ones growing and harboring the 

 diseases in locations inaccessible for such control programs. Spraying 

 or dusting with fungicides, invaluable in the case of many crop diseases, 

 is obviously impractical with grasses. Seed treatment is of value 

 only for those diseases known to be seed- or soil-borne and can arrest 

 only that phase of a disease that attacks the plant in the seedling- 

 stage of development. 



