Soybean stem canker
scouted Aug. 21, 2025
- Background
- Soybeans in Granville County were being scouted, and it was observed that 25% of the field was affected by browning between the veins and reddening leaf spots. The grower was worried the beans had drowned, but the symptoms looked like sudden death syndrome. A sample was sent to the PDIC for diagnosis.
- Conclusion
- Colletotrichum destructivum. The cause of the blight spots on the leaves was identified as Anthracnose, caused by Colletotrichum. While usually a disease that shows in the stems and the petioles, it can also cause leaf curling and reddening of the veins. Warm, wet weather favors infection and disease development. Crop rotation and tillage can reduce inoculum while foliar fungicides will reduce disease, but it's usually not profitable.
- Resources
