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This advice is from a Lesco rep. today

Discussion in 'Pesticide & Herbicide Application' started by robert payer, Sep 13, 2002.

  1. robert payer

    robert payer LawnSite Senior Member
    Posts: 282

    Called Lesco today looking for Finale. No luck they do not carry it. He said use roundup. For my application this will not work. I am hoping to be able to seed 4 days later like can be done with finale.

    Here is what is in question: Lesco worker Quote "Roundup, would never put this on the package but you can seed a lawn the same day after spraying Roundup" He says that he knows a guy that does it on a regular basis.

    Here is the potential logic: Roundup binds in the soil. Seed will germinate in about 14 days. Soil is fertile again after 7 days.

    Can it be done? Will seed be effected? Should one seed on the heavy side?
    Has any one done this and seen good results?

    Thank you!
  2. longviewlawncare

    longviewlawncare LawnSite Senior Member
    Posts: 298

    i seed after roudup all the time. I have not had any problems doing this.hope this helps
  3. robert payer

    robert payer LawnSite Senior Member
    Posts: 282


    Is any percentage of seed lost? When you use roundup in this case what rate are you mixing at? Any additional info would be appreciated. When overseeding have you ever left the thatch pulled up at the surface as mulch? Seed will make soil contact through mulch thatch top coat. Just hoping to be able to skip picking this thatch and still do a successful job.
  4. Runner

    Runner LawnSite Fanatic
    Posts: 13,494

    The newer Roundup has an absortion time of 2 1/2 hours. In other words, after 2 1/2 hours, the plant has fully absorbed enough of this to then internally kill the plant. (enough to affect the root) When it hits the soil, however, it deactivates. As long as scythe or some other form of salt isn't used, it should be safe to till (or prep) and seed after 4 days. EsPECially if it has happened to have been watered during this time.
  5. robert payer

    robert payer LawnSite Senior Member
    Posts: 282

    Question for clarification: Can a lawn be killed with roundup and over seeded the same day?
  6. Runner

    Runner LawnSite Fanatic
    Posts: 13,494

    Now, that, I don't know. The same day, I believe is a bit close.
  7. tremor

    tremor LawnSite Bronze Member
    Posts: 1,476


    There is 100% ZERO residual from RoundUp.
    The next time Monsanto re-registers RoundUp, it is likely that there will be some language changes to the label.
    I've not only seeded the same day as spraying RoundUp, but just 2 weeks ago a customer & I did a little test plot. We seeded Tall Fescue right into a mono stand of Crabgrass. Just before we left, I sprayed 1/2 of the plot with RoundUp Pro Dry.
    The half I sprayed is far healthier than the half I didn't. No weeds competition for one thing.
    I originally got this technique from a customer about 15 years ago. At first, I thought he was crazy. But he proved my wrong.
    My local Monsanto rep has also confirmed that Glyphosate has an effect on seed coats that is not unlike that of Phosphorous. In other word, Glyphosate HELP'S seeds to germinate.

  8. I do the same thing tremo discribed, but did not know about the germination. I just did it so when I was walking on the lawn with the slit seeder and/or aerator I did not walk with Round Up on my shoes, or a wet lawn after using a hose and spray tank to apply.

    I always thought it took several days for germination/grass leaf to show so in that time the Round Up would have done the job.

    I did my lawn this way just yesterday evening.
  9. TurfGuyTX

    TurfGuyTX LawnSite Senior Member
    from DFW
    Posts: 648

    I've done it and have had success. To answer your question, The lawn may not die the same day, but you can still reseed it. Use Round up Pro Dry or Quick Pro, it works better than Home cheapo version. Good luck.
  10. robert payer

    robert payer LawnSite Senior Member
    Posts: 282


    What is a mono stand of crabgrass?

    Do you also state that one can spray roundup right over the new seed?

    You have all been a big help here. This conversation is interesting and I hope that it will continue.

    Guys, did not want to single out Tremor as the sole hero here. Your testimonials were also appreciated.

    How about leaving top dressing of thatch to shade seed when overseeding?

    LawnSite, Gotta love it! Makes things so easy!

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