Presence of Cercospora leaf blight, does not guarantee purple seed stain, even though they are caused by the same organism. Foliar symptoms begin in the upper canopy on leaves exposed to the sun.

Frogeye leaf spot (FLS), caused by Cercospora sojina, is a serious disease affecting soybeans and can cause ... The fungus produces spores under warm, humid conditions with heavy dews (77-86⁰F; >90% ...