Oak

Quercus rubraI’ve noticed these grapefruit/softball-sized growths on the side of this big old Red Oak (Quercus rubra) before. But on my most recent pass, there was a new one. Turns out to be a fungus.Quercus rubra

5 Responses to “Oak”


  1. 1 crystalhrogers November 28, 2014 at 7:31 am

    well, what are they? My oaks have them also and some are a lot bigger than grapefruit. I always called them tumors.

    • 2 mthew November 28, 2014 at 9:04 am

      They are like a gall: something, bacteria or virus, causing the tree to make these growths. Not sure of specifics, though.

      • 3 crystalhrogers November 30, 2014 at 8:47 am

        I wonder if mine are something different. They get larger over time and I have never seen one suddenly appear and certainly never saw one of a different color. Any more thoughts would be appreciated.


  1. 1 Mushroom Monday | Backyard and Beyond Trackback on October 3, 2016 at 7:01 am
  2. 2 Oak Wilt | Backyard and Beyond Trackback on January 2, 2017 at 7:00 am

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