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Need help identifing fungus

Discussion in 'Pesticide & Herbicide Application' started by Cooter, Jun 23, 2009.

  1. Cooter

    Cooter LawnSite Senior Member
    from NE Iowa
    Posts: 510

    I got a call this morning to come and look at this. I am not sure of what it is. I've looked in all my identification books and find nothing, maybe I need better books. There are about 6-8 of these small gray/black spots in approximately 10' radius. If you brush or kick these spots a cloud of ash like substance appears. Thank you for your help.


  2. dKoester

    dKoester LawnSite Gold Member
    Posts: 3,256

    Powdery mildew.
  3. RigglePLC

    RigglePLC LawnSite Fanatic
    Posts: 12,207

    A classic case of slime mold. When it produces spores you get a powdery substance on the grass blades. Wash it off with a strong stream of water. Use your sprayer and some detergent or surfactant --that way you can charge the cutormer. Slime mold grows on the grass, not infecting in the grass. It does no harm to grass. Problem under warm wet conditions.
  4. Cooter

    Cooter LawnSite Senior Member
    from NE Iowa
    Posts: 510

    Powdery mildew is usually white. If you look closely at second pic there seems to be black spores on grass blades. I have never seen a cloud of powder from powdery mildew before. This site is not overly wet and seems to get enough airflow and sunlight.
  5. Rtom45

    Rtom45 LawnSite Senior Member
    Posts: 456

    Looks like slime mold to me also.
  6. Cooter

    Cooter LawnSite Senior Member
    from NE Iowa
    Posts: 510

    Thank you for your help. Nothing I have mentions slime mold.
  7. JDUtah

    JDUtah LawnSite Silver Member
    from UT
    Posts: 2,636

    Slime mold. Usually not harmful to the plant.

    The lesco site used to have a decent page on it, but not anymore...
  8. bx24

    bx24 LawnSite Senior Member
    from MA/TX
    Posts: 503

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