weird growth on grape vine

ajpd1989July 29, 2013

My father found this odd looking growth on one of the green branches of his grape vine.

He tried disposing it by burning it in the hottest part of a charcoal fire, but after several minutes it hadn't even started to burn. It was also cool enough to touch right after removing it.

Does anyone know what this is?

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fruitnut Z7 4500ft SW TX

That's not a grapevine. Not from what I can see. Don't know what plant that is just not a grape.

    Bookmark   July 29, 2013 at 12:27PM
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I'm quite sure it is. Here's another part of the same plant.

    Bookmark   July 29, 2013 at 1:05PM
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Funny, I have a weed growing right next to my concord grapes.. It too looks like a grapevine but the leaves are much thinner and definitely not as dense a vine. Check the base of the vine.

    Bookmark   July 29, 2013 at 1:56PM
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flatwoods_farm(9A Riverview, F)

Definitely a grape, and a nice one. I think these are a type of gall- a swollen stem area protecting an insect inside. Carefully slice them open and check for tiny larvae. Not sure which kind though. They don't really harm the vine unless there are lots of them.

    Bookmark   July 29, 2013 at 3:14PM
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nickl(Z7a NJ)

That is the grape tumid gall. The insect that causes it is called, not surprisingly, the grape tumid gallmaker. The adult is a type of midge.

The larval stage of the midge actually causes the gall. The galls usually form on leaves, but sometimes on stems, petioles and flower clusters.

It's generally not a major problem although if the gall forms on a flower cluster you won't get any grapes from that cluster. There usually aren't enough around to be an issue.

You can remove the gall if you don't like the way it looks. But since this is essentially an insect that lives on native grapes, it is questionable if removing it or leaving it will have any significant effect on the overall population.

    Bookmark   July 29, 2013 at 11:42PM
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