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Characterization and Survival of Cercospora sojina in Ohio

C. D. Cruz and A. E. Dorrance

May 2009


Frogeye leaf spot (FLS), caused by the fungus Cercospora sojina, is a common in soybeans in the southern USA. FLS is found in Ohio, but there were no documented losses from FLS in Ohio prior to 2006. This study evaluated four traits of C. sojina that may have contributed to the increase in incidence: (i) overwintering survival in crop residue; (ii) optimum temperatures for mycelial growth; (iii) pathotypes of the fungus in Ohio; and (iv) pathogenicity of isolates on cultivars with Rcs3 gene for resistance to FLS.


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