Holcus Leaf Spot
scouted May 29, 2025
- Background
- Corn at V10-V12 stage was scouted in Robeson county, where the leaves showed tan spots with reddish-brown margins, with an incidence of 80% and a 5-10% severity. No paraquat burndown applications have been applied in the area.
- Conclusion
- The spots were diagnosed as holcus leaf spot, a bacterial disease that shows up early in wet, warm conditions. It begins as circular, oval, or irregular dark green, water-soaked spots. As they dry, these lesions turn light tan to white, often with a thin, papery texture, and may develop light brown to reddish margins surrounded by yellow halos. The severity can vary wildly from leaf to leaf.
- Resources
