Managing Phytophthora Root and Stem Rot of Soybeans
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KEY POINTS
Phytophthora is a disease of extended wet field conditions. Such conditions may occur in any field but are most common on heavy soils.
Phytophthora may attack soybeans at any time during the growing season. The disease displays a seed rot phase, a seedling blight phase, and a root and stem rot phase.
Selecting varieties with specific race resistance or field tolerance is the primary means of combating Phytophthora.
Varieties with specific race resistance provide a high level of protection but may lose effectiveness if Phytophthora races change. Tolerant varieties provide protection against all races of Phytophthora.
Other management practices include improving field drainage, remediating compaction and hardpans, planting fields when soils are warm, and using seed treatments.