Forum home Fruit & veg

Strange root growths from apple tree stem

2»

Posts

  • kevin447kevin447 Posts: 5
    and yes @JennyJ, the green wire was a temporary fix that should have been removed but was forgotten! It's on my list for the weekend  :)
  • pansyfacepansyface PEAK DISTRICT DerbyshirePosts: 17,951
    Here is a dense discourse about some scientists who tried to tell the difference, if any, between burr knots and crown gall by doing a series of experiments on different apple trees.

    I no longer have the brain power to understand their findings and I don’t know what conclusions they came to in the end, but it would seem as if they were as confused by it as the rest of us.

    https://naldc.nal.usda.gov/download/IND43967640/PDF



    Apophthegm -  a big word for a small thought.
  • josusa47josusa47 Posts: 3,532
    I don't suppose this is much help, but years ago when I was a biology undergraduate, we were taught that galls are the plant equivalent of cancer.  They are areas of abnormal growth often caused by viral infection.  Some of these infections remain local, eg oak apples, and don't harm the plant, and some are systemic and will cause the plant to sicken and sometimes die.  The viruses can be airborne and enter the plant through random injuries, or may be introduced by insect bites.
Sign In or Register to comment.