Charcoal rot
scouted Aug. 10, 2026
- Scientific Name
- Macrophomina phaseolina
- Background
- A soybean field, variety Stine 77 EA 40, in Johnston County was being scouted, and it was observed that 25% of the field was dying in patches, some with brown spot, throughout the whole field. A sample was submitted to the PDIC for diagnosis.
- Conclusion
- The issue was identified as charcoal rot of soybean, caused by Macrophomina phaseolina. It starts out with patches of stunted or wilted plants, and while the infection can happen very early in the season, the symptoms usually appear after flowering or when plants become stressed. It usually does not represent a major threat to production in the state. Crop rotation to non-host crops may help limit survival of the fungus in soils, and drought stress mitigation, when needed, may limit the severity of disease symptoms.
- Resources