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Snap bean > Leaves > Holes in leaves

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  • Bean Leaf Beetle 1

    Credit: Eric Burkness, University of Minnesota

  • Bean Leaf Beetle 2

    Credit: Eric Burkness, University of Minnesota

  • Bean Leaf Beetle 3

    Credit: Eric Burkness, University of Minnesota

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green arrowBean Leaf Beetle
Cerotoma trifurcate

  • Adults feed on the undersides of leaf surfaces, resulting in small (1/10 inch), round holes
  • Can completely defoliate a plant
  • Adults also feed on pods, creating small pits
  • Adults are about ΒΌ inch long, oval-shaped and vary in color from yellowish-green to a brick red, with a black triangle directly behind their head
  • Adults first appear in May and are present throughout the growing season
  • More information on Bean Leaf Beetle...
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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

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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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  • Corn Earworm 1

    Credit: W. D. Hutchison, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowCorn Earworm
Helicoverpa zea

  • Larvae feed on foliage resulting in small holes
  • Larvae feed on outside of pod causing surface damage, may also burrow into pods to feed on seeds
  • Fully grown larvae are about 2 inches long with alternating dark and light lines running lengthwise down their backs; larvae vary in color from olive-brown to light green to pink to brown, with a lighter colored underside
  • Larvae are present in late June and again in August
  • More information on Corn Earworm...

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