Gray leaf spot
scouted Sept. 8, 2026
- Scientific Name
- Cercospora zea-maydis
- Background
- A corn field in Haywood County was being scouted, and it was observed that the field was affected by Gray leaf spot. A sample was submitted to the PDIC for diagnosis.
- Conclusion
- The leaves had signs of gray leaf spot. Gray leaf spot of corn is caused by the fungus Cercospora zea-maydis. This disease is present in almost all growing seasons, but it only causes economic losses if the conditions favor disease development. There are fungicides labeled for gray leaf spot; there are resistant hybrids available, and crop rotation and tillage reduce the survival of the fungus.
- Resources