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cold weather weed control

Discussion in 'Pesticide & Herbicide Application' started by RAlmaroad, Jan 19, 2007.

  1. RAlmaroad

    RAlmaroad LawnSite Silver Member
    from SC
    Messages: 2,253

    The weather in SC has dropped to about 45 at night and daytime 55-60 or so. There are lots of winter weeds including vetch. Does cold weather really affect the killing of such weeds when using atrazine or other herbicides? Thanks
  2. The Ranger

    The Ranger LawnSite Member
    from NE Ohio
    Messages: 208

    Not sure about atrazine, but in Ohio cold weather slows down the process of dying. Once temps drop below 45 we switch to an ester (oil based) herbicide. The oil opens the pores of the plant to increase the speed and amount the herbicide is taken up by the leaf. Esters work much better in cooler and even temps into the thirities.
  3. ThreeWide

    ThreeWide LawnSite Bronze Member
    Messages: 1,116

    Speed of control is a direct function of the growth rate of the plant. As the plant grows, your herbicide is translocated.

    So colder weather slows the process, but it will eventually produce results.
  4. tremor

    tremor LawnSite Bronze Member
    Messages: 1,476

  5. RAlmaroad

    RAlmaroad LawnSite Silver Member
    from SC
    Messages: 2,253

    My college chemistry tells me the same...Winter is a good time to watch the stuff go bye...Not much else to do out there but clean up. Roy
  6. TforTexas

    TforTexas LawnSite Senior Member
    Messages: 260

    Try using Carfentrazone. You can find it at Lesco under the name QuickSilver, or in a mix like Southern Speed Zone. It does not require translocation so works in colder temps.
  7. olive123

    olive123 LawnSite Senior Member
    Messages: 500

    atrazine does not work well in cold temps
  8. cemars

    cemars LawnSite Senior Member
    Messages: 387

    Speed Zone Southern indeed, cafentrazone added to an amine will help but ester can't be beat in cool weather.
  9. RAlmaroad

    RAlmaroad LawnSite Silver Member
    from SC
    Messages: 2,253

    What exter based products would you use for the Speed Zone My license is for Tenn only. We don't have Lesco's here; only Farmer's Co-Op. Thanks
  10. hmartin

    hmartin LawnSite Senior Member
    Messages: 590

    All the Co-ops sell 2-4d ester and it is cheap. Speedzone will work better, but it is 4 times the price.

    BWI will deliver you any herbicide you want in TN if you have a total order over $300.

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