91原创

Septoria Nodorum Blotch a.ka. Septoria Glume Blotch

May 2025 | Written by:听Joseph Cinderella and Dr. Alyssa K. Betts

Introduction

• Parastagonospora nodorum (syn.Septoria nodorum) is a fungal pathogen that can produce symptoms on leaves, stems, glumes, and awns.
• P. nodorum has a wide host range, which includes wheat species, other cereals, and wild grasses.
• Leaf blotch can lead to head infection known as glume blotch.

听

Identification

• Symptoms begin in the low canopy as small, yellow spots. Over time these lesions enlarge into an oval or 鈥渃at eye鈥� shape with a dark-brown center (Fig 1).
• Under favorable conditions, the entire leaf blade may become covered with lesions greatly reducing photosynthetic ability.
• Infected glumes may look dirty from a distance and are purple to brown in color (Fig 2).

Management

• Crop rotation allows stubble to decompose before re-introducing a host crop.
• Varieties with moderate resistance are available.
• Selecting high quality disease-free seed will reduce the chances of introducing inoculum.
• Certain fungicides applied for management听of Fusarium Head Blight at flowering may also have activity to reduce foliar and glume symptoms of glume blotch, particularly if disease is still low in the canopy.
• Under high disease pressure, foliar fungicides can be applied to protect flag leaf.
• Read and follow all instructions on any pesticide label before use.

听

References

Crop Protection Network (2022, January 24). Stagonospora Leaf and Glume Blotch of Wheat. Retrieved from:

Mehra, Lucky, et al. 鈥淪eptoria Nodorum Blotch of Wheat.鈥� Septoria Nodorum Blotch of Wheat, American Phytopathological Society, 2019,

Download/Print PDF Version