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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Fruit > Raspberry > Unusual growths on canes

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Raspberry > Canes > Unusual growths

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  • Image: Red-Necked Cane Borer 1
  • Image: Red-Necked Cane Borer 2
  • Image: Red-Necked Cane Borer 3

Red-Necked Cane Borer and Bronze Cane Borer
Agrilus ruficollis, Agrilus rubicola

  • Feeding by the white, legless larvae cause swellings on the cane
  • A “D”-shaped hole where the larva has exited the cane may be present
  • Adult is small (¼ inch), blue-black, with a dull coppery color on the area behind the head
  • Adults are active in late May and June
  • More information on Red-Necked Cane Borer
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  • Image: Crown Gall 1
  • Image: Crown Gall 2
  • Image: Crown Gall 3

Crown Gall and Cane Gall
Agrobacterium tumefaciens, Agrobacterium rubi

  • Spongy white tumor-like galls on the cane, roots, and crown
  • Older galls are brown to black and hard
  • Poor growth and fruit production may be seen on severely infected canes
  • More information on Crown Gall

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