What Is This on Oak Tree?

On our Oak tree last week, I noticed this green ball that I affectionately named our "Oak Grape" because it looks like a little green grape. I've never seen a "grape" looking thing growing on an Oak tree before. Does anyone know what it may be? It doesn't look like an acorn or any type of cocoon that I have ever seen.
Thank you!
q what is this on oak tree
q what is this on oak tree
  8 answers
  • Andra Andra on May 11, 2018
    At first, I thought it looked like a fig and wondered if you had a really cool hybrid tree on your hands! ;D
    According to the "Tree Folks" (link below), it's called a Gall and it won't harm the tree. Here's the link: https://www.treefolks.org/2014/04/4427/
  • Kat12065209 Kat12065209 on May 11, 2018
    Looks like an oak gall to me. Look up life cycle of Gall Wasp. Pretty facinating.
  • It's a gall. It won't hurt the tree.
  • Beth Ladnier Beth Ladnier on May 12, 2018
    Oh wow! I had never heard of such a thing! Thank you for your knowledge!
  • Candace Hunt Candace Hunt on May 12, 2018
    I have "galls" on my oak tree but they are fuzzy white balls with pink spots and it turns out that they contain mites. By August my tree will have lost all its leaves...
  • Gan11809821 Gan11809821 on May 12, 2018
    This is not an oak tree. The leaves are too thick and waxy. My bet is it's a fig tree and that ball is an immature fig. Watch it and if it turns deep red it's a fig. Eat it - they're delicious... especially right off the tree.

  • Bre22223529 Bre22223529 on May 12, 2018
    This is an oak tree It is a water oak or quercus nigra. Most likely an oak gall don't eat it. https://en.wikipedia.org/wiki/Quercus_nigra
  • Danya Galloway Danya Galloway on May 13, 2018
    It looks like a baby avacado and i think the leaves look like avacado leaves more then fig or oak . i dont know about the wasp thing
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