Phytophthora root and stem rot of soybean (PRR), caused by Phytophthora sojae, is well known to Iowa growers. The disease occurs throughout the growing season when soil temperatures are above 70 °F and especially following episodes of heavy rain. This spring, damping off due to infection by P. sojae (see photo) has been common because of very wet and warm growing conditions.
Iowa State University
Robertson, Alison E.; Cianzio, Sylvia R.; and Cerra, Sarah, "Populations of Phytophthora sojae are diverse within single fields" (2007). Integrated Crop Management News. 1062.
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