Inheritance of Resistance to Race 2 of Cercospora sojina in Soybeans 1

C ERCOSPORA sojina Hara, the causal fungus of frogeye leaf spot of Soybean (Glycine max (L). Merrill) , was found in Indiana in 1939. Athow and Probst (1) reported resistanc e to frog-eye leaf spot due to a single major dominant gene. The symbol s Cs cs were assigned to the gene pair. Probst and Athow (3) found no evidence that modifying factors act on the resistant gene to condition the inheritance of the intermediat e reaction of the varieties Perry and Chief. They observed only one race of C. sojina now referred to as race 1. Athow et al, (2) identified another physiological race of C. sojina in 1962 and named it race 2.