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Snap bean > Leaves > Spots on leaves

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  • Bacterial Brown Spot 1

    Credit: Michelle Grabowski, University of Minnesota

  • Bacterial Brown Spot 2

    Credit: Howard F. Schwartz, Colorado State University, Bugwood.org

  • Bacterial Brown Spot 3

    Credit: Howard F. Schwartz, Colorado State University, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowBacterial Brown Spot
Pseudomonas syringae pv. Syringae

  • Leaves develop small water-soaked spots that turn brown with a yellow margin
  • Leaf spots may fall out giving leaves a "tattered" appearance
  • Sunken brown spots can form on the pods
  • Pod may appear twisted or bent
  • More information on Bacterial Brown Spot...
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  • Common Blight 1

    Credit: V.R. Wallen, Agriculture and Agri-Food Canada, Bugwood.org

  • Common Blight 2

    Credit: Howard F. Schwartz, Colorado State University, Bugwood.org

  • Common Blight 3

    Credit: Howard F. Schwartz, Colorado State University, Bugwood.org

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green arrowCommon Blight
Xanthomonas campestris

  • Leaves develop water soaked spots more easily seen on underside of leaves
  • Leaf spots turn brown, sometimes with a yellow halo
  • Pods have water-soaked areas that later turn brown
  • More information on Common Blight...
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  • Halo Blight 1

    Credit: Howard F. Schwartz, Colorado State University, Bugwood.org

  • Halo Blight 2

    Credit: Howard F. Schwartz, Colorado State University, Bugwood.org

  • Halo Blight 3

    Credit: Howard F. Schwartz, Colorado State University, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowHalo Blight
Pseudomonas syringae pv. Phaseolicola

  • Underside of leaves have small water-soaked spots, eventually developing into reddish-brown lesions
  • Leaf lesions may be surrounded by an irregular greenish-yellow halo
  • Pods have small water-soaked spots
  • More information on Halo Blight...
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  • Viruses 1

    Credit: Michelle Grabowski, University of Minnesota

  • Viruses 2

    Credit: Michelle Grabowski, University of Minnesota

  • Viruses 3

    Credit: Michelle Grabowski, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowViruses
Bean Common Mosaic Virus, Bean Yellow Mosaic Virus and others

  • Leaves are curled, mottled, and may be yellow
  • Plants are stunted
  • Pods can be distorted, blotchy with dark and light green, and in severe cases, have bronze blotchy areas
  • More information on Viruses ...

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