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Too hot or dry to spray

Discussion in 'Pesticide & Herbicide Application' started by Cooter, Aug 28, 2008.

  1. Cooter

    Cooter LawnSite Senior Member
    from NE Iowa
    Messages: 510

    When is it too hot or dry to spray for weeds? Do you want the lawn actively growing. I have held off on a few yards due to it being so dry and the lawns are dormant.
  2. greendoctor

    greendoctor LawnSite Fanatic
    Messages: 10,000

    Yes, Yes and very good of you to leave dormant grass out of the spray round. I personally, will not take a lawn account if it is not on an automatic irrigation system. Why? Honolulu, Hawaii has 365 day growing season and less than 20 inches of rain per year.
  3. garydale

    garydale LawnSite Senior Member
    Messages: 813

    We do not spray stressed lawn overall but, we do spot spray certain weeds because they are still actively growing.

    Read the label.
  4. ro1207

    ro1207 LawnSite Member
    from Midwest
    Messages: 61

    Most herbicides have a threshold of around 85 degrees as a max temp, but just as important you need to judge the condition of the turf. if it is 70 degrees and you have not seen rain in a couple of weeks and the lawn is stressed don't spray, you may see damage even with this type of weather condition
  5. americanlawn

    americanlawn LawnSite Fanatic
    from midwest
    Messages: 5,954

    It's rare that you cannot kill weeds, but when we're in a drought situation, weeds become nearly as dormant as the turf...."ester" herbicides usually work. Amines often have little affect when weeds go into dormancy. Just got some rain testerday -- hope it made it up your way. Good luck.

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