Some phytophthora-resistant soybean varieties are becoming ineffective. NDSU Extension Soybean Pathologist Wade Webster covered the issue at the Best of the Best in Wheat and Soybean Research. The issue shows up in saturated soils. “The RPS1/C and RPS1/K are becoming ineffective so we need to shift more toward other sources of resistance such as the 3/A and the 6 genes,” said Webster. Other management practices like crop rotation can help reduce disease pressure. “Phytophthora is only able to infect soybeans. We can rotate out which can help knock down populations of the pathogen.” Unfortunately, phytophthora can live in the soil for up to five years. Shorter rotations will not eliminate the disease.
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