Corn disease could damage Iowa yields. 
A plant pathologist at Iowa State University is warning Iowa farmers to keep their eyes open for an emerging corn disease, which has the potential to reduce yields of impacted crops to near zero.  Alison Robertson, associate professor of plant pathology and microbiology at ISU, said there have been increased sightings of Physoderma, a corn disease that had gone unseen in the U.S. for decades but has been spotted more and more since 2007. The disease is caused by the fungus Physoderma maydis, and first appeared in India in 1910. In the 1930s, the disease hit the southeastern region of the U.S. and led to yield losses of between 5 and 10 percent in the area.