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How warm does it have to be for roundup to be effective?

Discussion in 'Pesticide & Herbicide Application' started by Cutworm, Jan 18, 2005.

  1. Cutworm

    Cutworm LawnSite Member
    Messages: 29

    Just wondering at what temp you guys stop spraying.
  2. westwind

    westwind LawnSite Senior Member
    Messages: 444

    anything below 40 degrees F, but up here have never sprayed later than Sept. 1
  3. PTP

    PTP LawnSite Bronze Member
    from Tulsa
    Messages: 1,398

    Whatever you are spraying it on has to be growing and not dormant.
  4. GroundKprs

    GroundKprs LawnSite Bronze Member
    Messages: 1,969

    There is no real temperature limit for Roundup application. The only qualification is that a plant be actively growing if you want to control it with Roundup. You can actually use Roundup as a selective over the top control at lower temps - i.e., desireable plants are dormant, but weed plants are still growing.
  5. Cutworm

    Cutworm LawnSite Member
    Messages: 29

    Thanks All!

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