Phomopsis stem canker is an economically important stem disease of sunflowers and soybeans that’s more prevalent in South Dakota. South Dakota State University Field Crops Pathologist Febina Mathew says Phomopsis spreads in humid weather and moderate temperatures. “We usually see the disease when sunflowers enter the early reproductive growth stages when conditions are right.” Crop rotation is one strategy that may mitigate Phomopsis risk.
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