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Curvularia Leaf Spot

Pest Background 

  • Curvularia leaf spot is caused by the fungal pathogen Curvularia lunata.
  • This disease was first observed in Delaware at the end of the 2020 season.
  • The economic impact of this disease is still unknown in the United States.

 

Identification

  • Early symptoms begin as small tan lesions with a yellow ring or "halo" when backlit (Fig 2).
  • Lesions expand minimally into round shapes and become tan in color at the center (Fig 3).
  • GLS lesions become larger than curvularia leaf spot lesions.
  • Curvularia leaf spot is typically found in the midtoupper canopy of corn plants (Fig 1).
A corn leaf with lesions caused by Curvularia lunata
Fig 1: A corn leaf with lesions caused by Curvularia lunata
A backlit leaf with lesions displaying characteristic halo symptoms
Fig 2: A backlit leaf with lesions displaying characteristic halo symptoms
Beginning lesion from Curvularia lunata compared with late season lesions
Fig 3: Beginning lesion from Curvularia lunata (left) compared with late season lesions (right

Management

  • At present, no foliar fungicides are labeled.
  • Differencesinvarietieshavebeennoted.
  • Crop rotation and tillage can decrease inoculum present in field.

 

References

Henrickson, M., & Koehler, A. M. (2019).Plant dis. 103:2692doi:10.1094/PDIS-

 

Authors: Madeline Henrickson and Dr. Alyssa Koehler


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