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Apples > Trunk > Overgrowth on trunk

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  • Image: Crown Gall 1
    Credit: Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, Bugwood.org
  • Image: Crown Gall 2

    Credit: William M. Brown Jr., Bugwood.org

  • Image: Crown Gall 3

    Credit: Division of Plant Industry Archive, Florida Department of
    Agriculture and Consumer Services, Bugwood.org

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green arrowCrown Gall
Agrobacterium tumefaciens

  • Galls (tumor like overgrowth) occur on roots, where the stem meets the soil, and at the site of pruning wounds
  • Young galls are soft, light green in color, with no bark
  • Older galls are brown to black and are hard
  • More information on Crown Gall...
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  • Image: Graft Incompatibility
    Credit: M. Grabowski, University of Minnesota
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green arrowGraft Incompatibility

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