Identify strange woody growth

Asked May 4, 2019, 7:36 PM EDT

Hello can you please help me identify the pest in the following pictures on my grape vines. My only guess was crown gall, but not really swollen just worm like woody growth.

Chisago County Minnesota

2 Responses

I have sent your question to the Enology Department at the U (Annie Klodd) and I will let you know when I hear back from her.

I heard from Annie.

This are called aerial roots. They are harmless, but the vine produces them when there is too much moisture: either saturated soil or too much humidity in the air, or both. So it is a sign of stress, but will not in itself hurt the vine.