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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Snap bean > Holes in leaves

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Snap bean > Leaves > Holes in leaves

1 of 3
  • Bean Leaf Beetle 1
  • Bean Leaf Beetle 2
  • Bean Leaf Beetle 3

Bean 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 ¼ 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...
2 of 3
  • Bacterial Brown Spot 1
  • Bacterial Brown Spot 2
  • Bacterial Brown Spot 3

Bacterial 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...
3 of 3
  • Corn Earworm 1

Corn 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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