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Phomopsis Stem Canker

In-Depth Downloads

ID

  • Lesions variable in color but mostly brown.
    Photo: Sunflower plant affected by stem canker.
  • Brown lesions on leaves and at leaf axils.
    Photo: Stem canker lesions on sunflower leaf.
    Photo courtesy of North Dakota State Univ. Extension Entomology - T. Gulya.

Facts

  • Easily confused with Phoma black stem.
    Photo: Sunflower plant stem affected by stem canker.
    Photo courtesy of North Dakota State Univ. Extension Entomology - T. Gulya.
  • Soil/debris born disease of worldwide importance.
  • Latin name: Phomopsis helianthi.

Management

  • No fungicide available.
  • Plant tolerant hybrids.
  • Avoid sunflower-on-sunflower rotations.