What weed is this and how do I kill it?

Discussion in 'Pesticide & Herbicide Application' started by Homecutter, Aug 21, 2009.

  1. Homecutter

    Homecutter LawnSite Member
    from Orlando
    Posts: 26

    This weed has spread like crazy in my Floratam over the past few months (I'm located in central FL). It spreads in circular carpet-like patches with some being rather large (20 ft in diameter). It's fairly dense and is choking out my grass in areas. I searched for a few hours but could not find an exact match online. It does not have flowers. The closest match I found was sorrels but that's not quite it.

    I don't want to just guess and start praying chemicals. I would prefer to know before I spray.

    Please, I beg you all..... TELL ME HOW TOP KILL THIS WEED!!!!:waving:

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  2. hughmcjr

    hughmcjr LawnSite Member
    from Oregon
    Posts: 183

  3. GREEN-UP

    GREEN-UP LawnSite Member
    from sw ohio
    Posts: 97

    looks like knotweed
     
  4. RAlmaroad

    RAlmaroad LawnSite Silver Member
    from SC
    Posts: 2,182

    Spurge--use metsurfuron for quick knockdown. Stuff has millions of seeds so you may need a pre-emerge like Gallery to slow it till cooler when you can use a little Atrazine.
     
  5. kirk1701

    kirk1701 LawnSite Gold Member
    Posts: 3,981

  6. greendoctor

    greendoctor LawnSite Fanatic
    Posts: 9,059

    This is the other good use of Tuflon Ester. Metsulfuron is only good for warm season grasses or pure stands of KBG. It is damaging to most other species of cool season grasses. You have clover. A Three Way amine will also work on this if you add a nonionic surfactant to the spray. Fall is actually the better time to deal with this weed.
     
  7. Heidi J.

    Heidi J. LawnSite Senior Member
    Posts: 341

    Yes, this is Prostate Knotweed, that you have. But the homeowner that posted this thread has Spurge. Like Greendoctor said, a good 3-way (use a sticker) can kill both. It will take a few apps. though, because that spurge has a waxy coating on it (summer weed). Spurge spreads like wild fire once introduce to a lawn. It needs to be sprayed, hire a professional :)

    Good luck!
     
  8. kirk1701

    kirk1701 LawnSite Gold Member
    Posts: 3,981

    greendoctor you lost me, or I'm a bit confused; are you saying I need both herbs now or is Metsulfuron part of TE?

    LOL this lawn care stuff is turning into be worse then studying for my Microsoft certifications :drinkup:
     
  9. Homecutter

    Homecutter LawnSite Member
    from Orlando
    Posts: 26

    Thanks for the replies guys. I think you guys nailed in with the Knotweed!

    I looked at the recommended treatments and this is what I found:

    Turflon Ester - not available in Florida.

    Metsulfuron- seems to be a rare. Zero finds on Ebay and only 1 on Google shopping - $35 for 2 oz.

    Atrazine- I have plenty of this but I'm concerned about temperatures here in FL right now 90°+ daily. What do you guys think about using Atrazine above 90°F?
     
  10. greendoctor

    greendoctor LawnSite Fanatic
    Posts: 9,059

    Metsulfuron is a totally different chemical from TE. For one thing, it kills fescue. TE will not kill well irrigated fescue that does not have preexisting heat damage.
     

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