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crown gall #159874 - Ask Extension

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crown gall #159874

Asked November 08, 2013, 12:38 AM EST

what can I do to control crown gall on grape vines ?

Napa County California

Expert Response

There are several ways that a grower can "live" with crown gall in the vineyard. In the Midwest and Northeast, we train up multiple trunks so if one truck develops a tumor, there are others to support a crop while the disease trunk is removed and a new one trained. Because vines are vegetatively propagated, it is likely that nearly every single vine contains at least a few bacterial cells (the ones that cause crown gall - Agrobacterium vitis), which means that when the conditions are right - such as an injury to the trunk or cane, gall development can occur.
The best way to control crown gall is to prevent it from developing, so only grow varieties that are appropriate for your region. Be sure to use a rootstock that is not susceptible to the disease. Be sure to purchase nursery stock that is clean - as in, Agrobacterium vitis-free. These vines were propagated from cell culture under conditions that make it very unlikely there are any bacterial cells in the cuttings. But, those vines do cost more. Also, keep the site well-drained, and try to keep vigor under control.
Here are a couple of links that may help:
http://nysipm.cornell.edu/factsheets/grapes/diseases/crown_gall.pdf
http://www.extension.org/pages/33098/crown-gall-of-grapes#.UoQelvmsi-0

Good luck!
Jodi Creasap Gee Replied November 13, 2013, 7:56 PM EST

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