3 thoughts on “Curious acorn”

  1. A branch fell off an oak tree as I walked by today and when I examined it. I saw that there were some ordinary acorns and these curious knobbly bits too. All over. Never seen it before and wondered if it was diseased

  2. Its a knopper gall….I looked it up and it is one of a series of galls that can affect oak trees. They are often caused by wasp larvae on different parts of the tree. Oak apples are another example. This particular one is a knopper gall ( see here for lots of info http://en.wikipedia.org/wiki/Andricus_quercuscalicis ).According to the website of a local woodland it was particularly prevalent round where I live in 2004. It does affect the fertility of the acorns. You can see lots of the different oak galls here http://www.hainaultforest.co.uk/3Oak%20galls.htm

  3. Its a knopper gall….I looked it up and it is one of a series of galls that can affect oak trees. They are often caused by wasp larvae on different parts of the tree. Oak apples are another example. This particular one is a knopper gall ( see here for lots of info http://en.wikipedia.org/wiki/Andricus_quercuscalicis ).According to the website of a local woodland it was particularly prevalent round where I live in 2004. It does affect the fertility of the acorns. You can see lots of the different oak galls here http://www.hainaultforest.co.uk/3Oak%20galls.htm

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