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Questions About Nectarine Trees

  • Answered by
    Downtoearthdigs on
    November 24, 2016
    A.

    Gummosis is the oozing sap from wounds or cankers on fruit trees.
    Gummosis can result from environmental stresses, mechanical injury, disease or insects.
    Cytospora canker or Valsa canker is the fungal cause of gummosis.

    One of the symptoms is that new shoots or leaves will yellow and wilt.
    The disease kills the wood underneath the canker.
    These fungus diseases overwinter on dead wood and in the spring release spores, they transfer to the tree with water splash or wind.
    They will enter the tree in open wounds (likely the graft site).

    Here is a link with more information.

    http://www.extension.uidaho.edu/nursery/Landscape%20problems/Bacterial%20Canker%20of%20Stone%20Fruit%20Trees.pdf

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