I looked up from my Sunday Times to see this hanging overhead. I can find similar "maple spindle galls" on -line but nothing on grape leaves. These are only on this one leaf on this plant. Not knowing whether they are a damaging creature or not but suspecting yes, I am about to drown the leaf (or worse if necessary).
Look closely to see the little yellow worm emerging from the gall I split open. One per package, wriggling away. Mmmm.
These I am less sure are a gall. They have no wriggling worms inside and each knob seems to be a single seed with a pit like sliver of a cavity in the middle. I am woefully uninformed about my grapes. I have not removed these yet and I'm not sure if I should.
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