Identify growths on grapevine cordon - Ask Extension
Can you identify the growths (circled) on the chardonnay cordons?
Knowledgebase
Identify growths on grapevine cordon #827102
Asked April 25, 2023, 11:46 AM EDT
Can you identify the growths (circled) on the chardonnay cordons?
Multnomah County Oregon
Expert Response
This looks like aerial rooting. Sometimes this is caused by crown gall. I suggest that you peel back the brown, loose bark and see what the growths look like underneath. Here are some resources to explore crown gall:
https://grapes.extension.org/crown-gall-of-grapes/
https://pnwhandbooks.org/node/2772/print
https://grapes.extension.org/crown-gall-of-grapes/
https://pnwhandbooks.org/node/2772/print
Is there any benefit from peeling off bark from grapevines periodically. The attached picture of my vines at the moment.
Thanks,
Steven Choate
2390 SE Meadow Ct.
Gresham, OR 97080
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From: ask=<personal data hidden> <ask=<personal data hidden>> On Behalf Of Ask Extension
Sent: Thursday, April 27, 2023 10:29 AM
To: Steven Choate <<personal data hidden>>
Subject: Re: Identify growths on grapevine cordon (#0097028)
The thin bark that sloughs off of the grapevine does not need to be removed. Removing it may be done in search of pests or disease. In this case, removing it would help you determine if you see signs of galling from crown gall. As shown in the photo provided, aerial roots are forming, which is a suggestion that there may be crown gall.
