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Weed killer after top-dressing & seeding

Discussion in 'Pesticide & Herbicide Application' started by coolbrze, Mar 16, 2012.

  1. coolbrze

    coolbrze LawnSite Member
    Posts: 124

    Can you apply a post-emergent broadleaf weed killer after top-dressing a lawn & seeding or should you wait until the seed has taken & is semi-established?
  2. RigglePLC

    RigglePLC LawnSite Fanatic
    Posts: 12,219

    In my experiments last year. I used Lesco Eliminate (Similar to Horsepower) when new grass was 1.5 inches tall--no injury resulted.

    Label recommends to wait until it is mowed twice.

    Or...did you mean you wanted to spray before germination? Has anybody tried that?
  3. maleaco

    maleaco LawnSite Member
    Posts: 8

    Yes usually you can if you follow directions maybe even a little less than directions for saftey
  4. coolbrze

    coolbrze LawnSite Member
    Posts: 124

    It was someone we saw applying it last week while working across the street from us. They top-dressed the lawn w/ compost, seeded it, then applied a granule broadleaf weed killer, I can't remember what it was though. I didn't say anything but was wondering how that would work out w/ the seed germinating...
  5. RigglePLC

    RigglePLC LawnSite Fanatic
    Posts: 12,219

    Experiments I conducted in August of 2011, found that seed sowed 3 days after spraying bare soil with Lesco Eliminate herbicide germinated adequately and were only about a quarter inch shorter than untreated soil.
    T-Zone treated soil still showed some stunting and reduced germination, when sowed up to 5 days after spraying.

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