DATCP’s 2014 early soybean disease survey found the highest level of Phytophthora root rot since the beginning of this survey in 2008 and identified four different species of Phytophthora on Wisconsin soybean. Besides the well-known cause of seedling root rot Phytophthora sojae, DNA based testing also determined P. sansomeana that was first detected in Wisconsin soybeans in 2012, and two additional new species P. pini and P. sp. “personii”.
Soil Science Extension
University of Wisconsin Madison