Identification Symptoms

  • The lesions are usually observed on the leaf sheaths although leaf blades may also be affected.
  • Initially, lesions are small, ellipsoid or ovoid, and greenish-gray and usually develop near the water line in lowland fields.
  • Under favorable conditions, they enlarge and may coalesce to form bigger lesions with irregular outline and grayish-white center with dark brown borders.
  • The presence of several large spots on a leaf sheath usually causes the death of the whole leaf.