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Snap bean > Pod > Spots or blotches on pod

1 of 6
  • 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

  • Pods have small water-soaked spots
  • 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
  • More information on Halo Blight...
2 of 6
  • Common Blight 1

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

  • Common Blight 2

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

  • Common Blight 3

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

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green arrowCommon Blight
Xanthomonas campestris

  • Pods have water-soaked areas that later turn brown
  • Leaves develop water soaked spots more easily seen on underside of leaves
  • Leaf spots turn brown, sometimes with a yellow halo
  • More information on Common Blight...
3 of 6
  • Bacterial Brown Spot 1

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

  • Bacterial Brown Spot 2

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

  • Bacterial Brown Spot 3

    Credit: Michelle Grabowski, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowBacterial Brown Spot
Pseudomonas syringae pv. Syringae

  • Pod may appear twisted or bent
  • 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
  • More information on Bacterial Brown Spot...
4 of 6
  • Bean Rust 1

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

  • Bean Rust 2

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

  • Bean Rust 3

    Credit: Michelle Grabowski, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowBean Rust
Uromyces appendiculatus

  • Pods and stems develop reddish-brown raised pustules
  • Leaves develop reddish-brown, raised pustules surrounded by a yellow halo
  • Powdery brown spores can be seen when spots are rubbed with a white tissue
  • Severe infections cause leaves to brown, dry, and drop from the plant
  • More information on Bean Rust...
5 of 6
  • Anthracnose 1

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

  • Anthracnose 2

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

  • Anthracnose 3

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

  • - CLICK PHOTOS TO ENLARGE -

green arrowAnthracnose
Colletotrichum lindemuthianum

  • Dark brown to black, sunken oval spots on pods
  • Seedling stem has black lesions
  • Black, sunken streaks or ovals on petioles and stems
  • Random dark brown to black lines develop along leaf veins
  • More information on Anthracnose...
6 of 6
  • 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

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

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