Neocosmospora stem rot
scouted Aug. 10, 2026
- Scientific Name
- Neocosmospora vasinfecta
- 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 affected by brown spot, dying in patches, with suspected southern Stem Blight in one area. A sample was submitted to the PDIC for diagnosis.
- Conclusion
- The issue was confirmed to be Neocosmospora stem rot, caused by the fungus Neocosmospora vasinfecta. Symptoms of Neocosmospora root and stem rot can include interveinal chlorosis on the foliage, the presence of small red fungal structures around the crown, and discoloration of the pith. These signs can resemble other stem diseases, especially red crown rot. As interveinal chlorosis progresses, lower leaves may begin to drop earlier than expected. Both the roots and pith may also show varying degrees of discoloration. https://cropprotectionnetwork.org/publications/scouting-for-soybean-stem-diseases
- Resources
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- No resources have been added.