|Subject||Crown Gall Disease|
Severity varies greatly with factors such as locations of the galls, cultivars, cultural practices, and, most important, the influence of climate. The galls are typically found on roots and crowns, and sometimes on canes and stems. The disease is more common and the symptoms more severe in cold climates. Latent infections of the bacterium are common in grapevines and many sources of planting stock harbor the bacteria.
In California, the long term effects of crown gall are difficult to assess or predict, especially where winters are mild. Even in vineyards where infection incidence is low, crown gall has the potential to cause problems when vines are grafted or budded with new scion varieties. Other types of mechanical injury can also trigger the formation of galls.
Dr. Tom Burr, Professor of Plant Pathology at Cornell University, New York.
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Tom Burr, Plant Pathology & Plant-Microbe Biology, Cornell University, February 10, 2015
Dr. Tom Burr leads a highly regarded, world class research program on crown gall of grapes (Agrobacterium vitis). Dr. Burr came to UC Davis at the invitation of the National Clean Plant Network for Grapes to present the most current knowledge about crown gall, its control and management, as well as future research direction.
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“STRATEGIES FOR CONTROLLING CROWN GALL IN NURSERY STOCK” - Dr. Tom Burr, Professor of Plant Pathology, Cornell University. Presented on June 20, 2006 at the Grapevine Clean Plant Workshop hosted by UC Davis Extension.
Bini, F., Kuczmog, A., Putnoky, P., Otten, L., Bazzi, C., Burr, T. and Szegedi, E. 2008. Novel pathogen-specific primers for the detection of Agrobacterium vitis and Agrobacterium tumefaciens (PDF) Vitis 47(3).
Burr, T. 2004. Grape crown gall biology and strategies for control (PDF). Foundation Plant Services Grape Program Newsletter, Fall 2004: 16-18.
Martinson, T. and Burr, T. 2012. How Close are We to Crown Gall-Free Nursery Stock? (pdf). Research Focus 2012-1, Cornell University Viticulture and Enology Program, 6pp.
Schroth, M. 1992. Crown Gall. Pages 94-96 in: Grape Pest Management, 2nd edition. University of California Division of Agriculture and Natural Resources Publication 3343, Oakland, CA.