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Pod and stem blight

Area of impact: Stem and pods

Description: Small, black raised spots arranged in straight lines on the mature stem and scattered on the pods. Infected seeds are cracked and shriveled and might have white mold on them.

Pathogen involved: Diaporthe phaseolorum var. sojae (a fungus)

Timing/Conditions: Symptoms occur from mid-season to maturity, but infection can happen at any time. Prefers warm humid weather.

Contributing factors: Continuous soybeans. Overwinters in soybean tissue and infected seeds.

Management practices: Harvest seed quickly after maturity, rotate with non-bean crops, plant high-quality seed and use foliar fungicides.

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