Help id this fungus

Discussion in 'Pesticide & Herbicide Application' started by mikesturf, Jul 22, 2013.

  1. mikesturf

    mikesturf LawnSite Senior Member
    Messages: 797

    Lawn is in full sun, grass is mostly kentucky blue grass with some rye.
    The disease/fungus from 5' away looks like grey/black blotches. Close up it looks like this dots on the grass.

    We have had lots of rain. They have not watered in a while. 50% slow release fert applied 5 weeks ago.



  2. turfmd101

    turfmd101 LawnSite Bronze Member
    Messages: 1,376

    smut mold.
  3. mikesturf

    mikesturf LawnSite Senior Member
    Messages: 797

    Yes, that is it! Thanks. Just found lots more info on it on the Purdue turfgrass website.

    Been doing lawn care for 8 years and I have never seen this before.
  4. Smallaxe

    Smallaxe LawnSite Fanatic
    Messages: 10,082

    Just for our benefit,,, how is the drainage???

    The grass also looks a little long with all those blades folded over on top of a neighbor...
  5. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,794

    Usually called "slime mold". Needs very warm and wet conditions. Seldom causes any actual damage to grass. It grows on the grass for support without actually injuring the grass in any way. At times it forms a black dirty powder as it becomes dry. You can rinse it off with a strong stream of water--or brush it off with a stiff broom.
  6. mikesturf

    mikesturf LawnSite Senior Member
    Messages: 797

    I'm guessing the grass is 4.5 inches high. I tell them to keep it mowed now less than 3 inches. They put in new sod 3 years ago. Excellent drainage.
  7. americanlawn

    americanlawn LawnSite Fanatic
    from midwest
    Messages: 5,955

    Hi Mike, we have not seen slime mold here for over a month when the rains stopped & the heat rolled in. It always goes away fairly quickly on it's own. Had it in my lawn too. On KBG as well as tall fescue. It lasted less than 2 weeks. When customers call, we check it to make sure, then we just leave an Iowa State fact sheet. Pretty much, folks just want to know what it is, and will it kill their lawn. lol

    We have received less than 0.3 inches of rain during the past 5 weeks. Heat index then exceeded 100 degrees. That pretty much put a stop to slime mold. More recently, it's been pythium, summer patch, and brown patch.
  8. turfmd101

    turfmd101 LawnSite Bronze Member
    Messages: 1,376

    Slime mold is the proper term not smut mold. Just wondering if it would be noticed for Brown patch is still used by most who post even though it is now referred to as Large patch. But who's counting.

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