Phytophthora sojae is present in many fields across the North Central region and Ontario, Canada, and had been managed very successfully with the deployment of single resistance Rps genes (Rps1a, Rps1c, Rps1k, Rps3a, and Rps6) as well as partial resistance (field resistance or tolerance). However, there are an increasing number of reports where varieties are sold that have Rps genes that are no longer effective towards the regional population or lack sufficient levels of partial resistance. The consequence is stand loss through damping-off or the development of stem rot throughout the season which results in lower yields and added weed pressure. The most recent survey of P. sojae...
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