What’s on Ohio’s Grape Growers’ Minds this Summer?

Crown gall, that’s what.

Crown gall tumors 2

Seriously, though, aren’t those gorgeous tumors?

Crown gall in grapevine:

  • As can be seen in the disease cycle, this bacteria is spread through propagation material.
  • Caused by the bacteria, Agrobacterium vitis
  • Found throughout plant and in grape roots left in soil
  • Injury sites are typically location of tumor development
  • Root necrosis may negatively affect vine growth
  • Bacterial DNA inserted into plant genome and expressed
    • Genes code for plant growth regulators, which increase cell division and enlargement.
    • Leads to disorganized growth = tumors or galls
Crown gall vine and up close

Crown gall on Noiret. Tumors disrupt water and nutrient flow through the vine, which stresses, then often kills vines.

Some vines survive infestation, simply through multiple trunks. Note the old tumors (orange arrow) on a vine with new tumors (red arrow).

Some vines survive infestation, simply through multiple trunks. Note the old tumors (orange arrow) on a vine with new tumors (red arrow).

Tumor development in the vineyard can be devastating in summers following especially harsh winters. Two-thirds of this Riesling vineyard had to be replanted, as a result of crown gall.

Tumor development in the vineyard can be devastating in summers following especially harsh winters. Two-thirds of this Riesling vineyard had to be replanted, as a result of crown gall.

Here are some management strategies.

Management Strategies

 

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