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Lawn Fungus....Please Help Identify

Discussion in 'Homeowner Assistance Forum' started by Craig Barn, Aug 3, 2018.

  1. Craig Barn

    Craig Barn LawnSite Member
    Messages: 9


    Attached are pictures of a fungus that is destroying the grass. Can someone please help identifying and prescribe the right treatment? It seems to be worst in high humidity and after a natural rainfall. Irrigation watering in high humidity will also bring it out but not as bad as natural rainfall.

    Please help!
    Fungus 1.JPG Fungus 2.JPG Fungus 3.JPG
  2. oqueoque

    oqueoque LawnSite Platinum Member
    Male, from Jersey
    Messages: 4,495

    hort101 and Mike NY like this.
  3. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 15,470

    I think it is dollarspot. Try to reduce average humidity by watering only twice per week, but more deeply. And only irrigate in the afternoon, making sure grass is completely dry before nightfall.
    If not, fungicide is your best solution.
    If you seed go with a higher-quality more disease resistant seed. Perennial rye is OK, if it is disease resistant. Inexpensive perennial rye is susceptible.

    grass4gas and hort101 like this.
  4. OP
    Craig Barn

    Craig Barn LawnSite Member
    Messages: 9

    Oqueoque - Thanks. That was my thoughts but did not want to influence anyone. The picture in the first link could be one of the pix I posted. :mad:

    Riggle - Thanks and I will water in the afternoon only. I actually haven't watered is about three weeks because we have been getting plenty of rain up here in NY.

    Do you guys recommend any specific products? They seem extremely expensive and I want to buy the right ones. Seems like Segway (cyazofamid) and Subdue Max and or Heritage (Azoxystrobin) maybe the way to go.

    BTW I should have mentioned the grass is mostly Rye and Fescue with some Kentucky blue.
  5. Silver Cymbal

    Silver Cymbal LawnSite Member
    Messages: 64

    Not sure what state your are in but I am in Mass and had the EXACT same issue. It also damaged a large amount of my turf but I water this lawn daily as the soil is incredibly sandy so previously that was all that could keep it going but I think it became too much this year. Lawn look just like yours.
  6. walkinonwater27

    walkinonwater27 LawnSite Senior Member
    from ct
    Messages: 370

    I vote dollarspot, unless it’s newly seeded turf, then it could be pythium. I would spray with a fungicide to slow the progression but your going to need to aerate and seed.
  7. walkinonwater27

    walkinonwater27 LawnSite Senior Member
    from ct
    Messages: 370

    The last picture , bottom left hand corner. There’s a nice hour glass shaped lesion
  8. OP
    Craig Barn

    Craig Barn LawnSite Member
    Messages: 9

    Thanks for the responses. Please keep them coming.

    Walkinonwater27 - What does the hour glass mean?

    So far over the course of a month I have:
    1. Sprayed 2.5 gallons of Companion.
    2. Used a 30 pound bag of Heritage G.
    3. And tried a home remedy of attacking the PH. I read that fungus' do not like rapid PH changes. I was at 6.0 which was low anyway.
    4. Put down pelletized lime to assist with the PH changes.
    Yesterday it rained again (hard) and is extremely humid and I see very little of the white cottony crap and the grass that's left looks healthier. I think I'm starting to make some progress.

    Until today I didn't feel to good about the progress and decided to step it up a bit. I ordered Strobe 50 WG and Regulate Select. Hopefully I do have it under control and the new fungicides will eradicate the nasty spores once and for all.

    My future lawn care will include a future fungicide application as preventive maintenance.


    Heritage G:

    Home made fungicide-I know this was intended for plants....but figured, why not?:

    Strobe 50 WG:

    Regulate Select:
  9. Trees Too

    Trees Too LawnSite Platinum Member
    Messages: 4,963

    hort101 likes this.
  10. Puttinggreens

    Puttinggreens LawnSite Senior Member
    Male, from southeast PA
    Messages: 413

    Read the Heritage label carefully, Dollar spot is no longer on it. Heritage is weak on Dollar spot at best. At least it is not on the Azoxy label, which is a generic, cheaper version of Heritage

    Water in the afternoon? Reasoning? I wouldn't recommend this practice. Early morning, when winds are light, is best, 5, 6, 7:00 AM. There is also much less evaporation at this time of day versus afternoon, so the water you use ends up on the soil, not the air.
    hort101 likes this.

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