Purple seed stain, also known as Cercospora leaf blight, has been positively identified on soybeans in several Kansas fields this year. This disease is most common when moisture is abundant during the reproductive stages of growth and where soybeans have followed soybeans in the rotation.  While it occurs at low levels almost every year, in some years, such as 2014, it is much more abundant. Producers may wonder what effect it has on yields and seed quality. The first signs of a problem occur about the time of seed set. Upper leaves exposed to the sun develop a distinct [...]