The prevalence of Phytophthora rot this year has been higher than in past years, perhaps due to more races that can infect soybean cultivars with the Rps-1k gene. Reports indicate that occurrence of this disease was still high in late July. So, how much damage will this disease cause for the rest of the growing season? In Iowa, major documented damage by this disease occurs in seedlings as stand reduction caused by damping-off. Stand reduction by root rot and stem rot in advanced growth stages is minor, thus damage by this disease in the rest of the season should be minimal.
Iowa State University
Yang, X. B., "Soybean Phytophthora in August" (2001). Integrated Crop Management News. 1945.
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