Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Crab Apple > Overgrowth on trunk
Crab Apple > Trunk > Overgrowth on trunk
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Crown 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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Graft Incompatibility
- Overgrowths at, above, or below the graft union
- Graft components breaking apart cleanly at the graft union
- Marked differences in growth rate or vigor of scion and rootstock
