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Post Emergent application

Discussion in 'Homeowner Assistance Forum' started by KTNC, May 26, 2008.

  1. KTNC

    KTNC LawnSite Member
    Messages: 88

    I use a blanket application of Trimec every spring for dandelion control, with no problems. This year I had very few dandelions. But I'm wondering is there any need to do an application in the fall too, to prepare for next spring, or because Trimec is a Post M, will I just be wasting my time and money?
  2. Rtom45

    Rtom45 LawnSite Senior Member
    Messages: 456

    You answered your own question. Post emergent herbicides only control weeds that have germinated. Pre emergent herbicides control weeds by forming a barrier on the surface of the soil. The pesticide label will tell you how the chemical works, what weeds are controlled, when to apply. Follow the label instructions to avoid uneccesary chemical applications.
  3. Grassmechanic

    Grassmechanic LawnSite Silver Member
    Messages: 2,697

    If I was to do only 1 app for broadleaf weeds, it would be in the fall, but doing a spring and fall app is acceptable, providing you apply according to the label.

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