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Questions About Ash Trees

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  • Answered by
    Tea on
    April 25, 2017
    A.

    These azaleas have been beautiful bloomers until the last season. I was hoping you could identify the green lichen-looking stuff, as the branch die-back seems to be following it. I read the articles and none of the photos matched what is happening with these. I will examine the branches closest to the roots to look for phytophthora. I am afraid I will lose all 3 if I don't apply the correct treatment.

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  • Answered by
    Downtoearthdigs on
    April 25, 2017
  • Answered by
    Downtoearthdigs on
    June 7, 2017
    A.

    A guess as to why your ash leaves are falling is ash anthracnose, a fungal disease that afflicts ash and other trees in cool, damp, spring weather. It results in leaf drop and the leaves will typically have brown or black blotches that appear on the leaflets that often become distorted, curling toward the blighted areas.
    Fortunately, anthracnose does not cause serious harm to healthy, well established trees. The affected trees continue to leaf out. Leaves that develop later in spring usually are not affected, as weather conditions are less favorable for anthracnose development. There is no need to apply a fungicide to affected trees.
    Read about ash anthracnose here: https://www.ag.ndsu.edu/news/newsreleases/2010/may-17-2010/anthracnose-hitting-ash-trees-hard

    http://www.dnr.state.mn.us/invasives/terrestrialanimals/eab/index.html
    http://www.extension.umn.edu/garden/insects/find/emerald-ash-borer/

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  • Answered by
    MichiganDot on
    July 16, 2017
    A.

    I'm sorry, it is a goner. I'd return it to the place it was purchased for refund. Most bona fide nurseries guarantee their plants.

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  • Answered by
    Downtoearthdigs on
    August 17, 2017
    A.

    Did you have your tree treated as a preventative or is it detected in your tree?
    If your tree is suffering symptoms of stress or disease, I would have it inspected again.
    You may want to check with your County Extension Office to check on the progress of EAB disease in your area.

    “Autumn Purple” ash trees suffer from several problems. The emerald ash borer, an invading pest, kills infested ash trees within five years if not sooner. Other insect pests include lilac borers, carpenter worms, leaf miners, ash sawflies and ash leaf curl aphids. Nests constructed out of webbing appear in ash trees infested with webworms. These are especially visible in the fall. Plant diseases like fungal leaf spots, powdery mildew, rust, anthracnose, and cankers can cause serious problems for the “Autumn Purple” ash tree.
    http://www.emeraldashborer.info/documents/Multistate_EAB_Insecticide_Fact_Sheet.pdf
    https://www.gardeningknowhow.com/extension-search/

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  • Answered by
    MichiganDot on
    May 5, 2018
    A.

    Yes, it is likely that you'll see suckers for a year, maybe two. Mowing should be enough to control them although they are easy to break off at the root which would be better.

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  • Answered by
    BushDoctor on
    May 28, 2018
    Certified Expert
    A.

    I would not cut any roots within 5 feet of the tree. These are massive nutrient vessels, and its only means of foundation. Anything outside of this will be fine.

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