Inheritance of Resistance to Two Races of Puccinia coronata Cda. var. avenae Fraser and Led.

Oats rank third in importance among the cereal crops of the United States and represent the most important small grain crop in many states. Crown rust (Puccinia coronata Cda. var. avenae Fraser \u26 Led.) usually has been the most destructive disease of oats in the United States and throughout the world. The most effective means of controlling this disease has been the development and distribution of varieties resistant to the common races of the fungus. Before a resistant variety can be used effectively and efficiently as a source of resistance in breeding, it is essential that the genetic factors controlling the resistance to specific races be identified and their mode of inheritance determined