Source: Iowa State University Extension and Outreach
Rotating to soybean in the following year may help reduce the tar spot inoculum in that field. Another consideration is to plant a tar spot tolerant hybrid in that field and surrounding fields.
Given the wet growing conditions over the last month, corn in parts of Iowa will be very susceptible to Physoderma brown spot and node rot, caused by the fungus Physoderma maydis, and gray leaf spot, caused by the fungus Cercospora zeaemaydis.
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