Black spots showing on lawn, looks like powder on grass

Discussion in 'Homeowner Assistance Forum' started by NEwhere1, Sep 13, 2012.

  1. NEwhere1

    NEwhere1 LawnSite Member
    Posts: 63

    WTH is this stuff?

    What do I do about it?



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  2. macgyver_GA

    macgyver_GA LawnSite Senior Member
    Posts: 826

    Looks like Helminthosporium fungus

    http://www.caes.uga.edu/publications/pubDetail.cfm?pk_id=6072#Diseases

    I noticed two of these spots in my yard the other day. I think the cool dry week, followed by high humidity all last week, then a quick snap back to low humidity and cool temps on Sunday made conditions favorable.
     
  3. macgyver_GA

    macgyver_GA LawnSite Senior Member
    Posts: 826

    Here's a better article for turfgrass. I noticed that other one was for forage grasses. I was on my phone when I posted that last one.

    http://www.caes.uga.edu/publications/pubDetail.cfm?pk_id=7395

    http://edis.ifas.ufl.edu/lh048 - This one gives fungicides that will control it in turfgrass

    Here's a "Homeowners reference" of fungicides and their common names and manufacturers

    http://edis.ifas.ufl.edu/document_pp154

    Looks like Spectracide Disease Control Granules contains myclobutanil which is labeled for turfgrass and is available at the big box stores for you to purchase.
     
  4. macgyver_GA

    macgyver_GA LawnSite Senior Member
    Posts: 826

    Could also be slime mold which will probably go away on its own since it's been dry all this week with no rain.

    Take a closer pic of the individual leaf blades and post them.
     
  5. NEwhere1

    NEwhere1 LawnSite Member
    Posts: 63

    Think it could be Slime Mold?

    It does rub off of the grass.
     
  6. NEwhere1

    NEwhere1 LawnSite Member
    Posts: 63

    You posted while i was typing, I'm thinking that's what it could be too, I'll take closer pictures tonight and post them.
     
  7. macgyver_GA

    macgyver_GA LawnSite Senior Member
    Posts: 826

    If it rubs off, then I'm leaning towards slime mold.

    I'll check my patches out tonight too and see if mine are the same. I noticed one on either side of my driveway over the weekend.
     
  8. NEwhere1

    NEwhere1 LawnSite Member
    Posts: 63

    Just called "Lawn Doctor" who has treated our yard 2 times so far (got them coming before i had time to get interested in doing all this myself). Dude there said it's Powdery Mildue, and that Slime mold grows on the dirt vs. the living grass......Not convinced they know what they are talking about
     
  9. macgyver_GA

    macgyver_GA LawnSite Senior Member
    Posts: 826

    I was out mowing my yard yesterday evening and noticed the patches are pretty much gone. I think the dry weather all week took care of it.
     
  10. NEwhere1

    NEwhere1 LawnSite Member
    Posts: 63

    I looked too last night, the spots were less noticeable, and were not spreading. I could rub the black stuff off of some on the blades of grass i tried.
     

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