If you attended any Iowa State University Extension and Outreach events in the past two years, you’ll have heard the word "Oomycetes” come up, particularly with reference to seedling diseases of soybean (and also corn). Phytophthora sojae and Pythium species are oomycetes, and they can result in stand loss early on in the season if conditions are particularly wet.
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Robertson, Alison E., "New ‘Focus on Soybean’ Talk Offers Knowledge, Management Tactics for Battling Soybean Root and Stem Rots" (2014). Integrated Crop Management News. 3.