Herbicide in cold

Discussion in 'Pesticide & Herbicide Application' started by RigglePLC, Apr 3, 2019.

  1. Hineline

    Hineline LawnSite Senior Member
    Messages: 991

    We don't leave a lawn until we at least try to spray speedzone right now. It was warm today so I know we did damage.
     
  2. OP
    OP
    RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 16,021

    Here are two dandelions sprayed on April 5 2019, when it was 41 degrees F.
    This photo was at 5 days later. Coincidentally the temperature was the same 41 degrees. Then the temperature increased just before the close-up pictures were taken. The digital thermometer takes about 5 minutes to respond.
    Speedzone treatment on the left and a 3-way on the right. And then the same weeds close-up.

    It appears that the herbicide is still effective--but rather slow.

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    Last edited: Apr 10, 2019
  3. OP
    OP
    RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 16,021

    Here is some wild garlic. Speedzone spray on the left. 3-way on the right.
    Tough weed in early spring.
    This weed is less visible after a couple mowings, at least in my experience.

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  4. OP
    OP
    RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 16,021

    It appears that the dandelion sprayed with Speedzone (left) in early spring cold was affected although slowly, however it may be recovering.
    Dandelion on the right, treated with 3-way may also be recovering. Not sure--it will be a couple weeks until the results are definite. Our first mowing of the year is a couple days away.

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