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Dimension (dithiopyr) effect on seed

Discussion in 'Pesticide & Herbicide Application' started by RigglePLC, Aug 11, 2011.

  1. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,727

    Containers of soil were treated with Dimension (dithiopyr) crabgrass control at about 4 and 9 pounds per thousand sq ft. (Roughly .22 and .45 pounds active ingredient per acre).
    I planted seeds (Scotts "High Traffic") in half-inch deep holes to simulate tilling or slit seeding. 8 days later and 63 days after treatment with Dimension,
    seven sprouts were visible. Sprouts were miss-shapen and were growing slowly.
  2. Patriot Services

    Patriot Services LawnSite Fanatic
    Messages: 14,360

    I read another thread on using pre em on new sod. Ric and another poster pointed out this goes against label advice. This product is intended for established turf as well. I'm not surprised by the results. I always thought there wasnt much you can or should do about weeds prior to seed/sod, germination/establishment other than starting with as sterile a soil as possible.:usflag:
  3. Ric

    Ric LawnSite Fanatic
    Messages: 11,969



    I am real surprised at you with all your years in the business. The above link is more about sod but I would think Seed is even more common sense than the Sod Question. If Pre emerge works on weed seeds? Why wouldn't it work on desirable grass seeds?? Seeds are seeds.
  4. grassman177

    grassman177 LawnSite Fanatic
    Messages: 9,795

    oh but seeds are not just seeds, in fact grass is a monocot, and ,most weeds are dicot. the chemical differentiates between the too, but it is still too strong for a non established root system is the thing. oh snap
  5. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,727

    I am surprized that the seed came up at all. I am sure larger seeds have more punch than smaller seeds. Rye before blue. Maybe it has been long enough for a fall seeding to take place. Or maybe not. Stay tuned for more info in about a week.

    I don't always believe what the label says. Sometimes they are just trying to protect themselves and err on the side of reduced risk to the manufacturing company.
  6. grassman177

    grassman177 LawnSite Fanatic
    Messages: 9,795

    i have grown seed in spring soon after dimension was applied with no issues. i have done it many times actually. it is not as strong on seedlings as everyone should know barricade can me, and pendi is pretty strong too
  7. Ben Greener

    Ben Greener LawnSite Member
    Messages: 12

    Your rye grasses will germinate through a moderate dose of dithiopyr. blues and fescues will generally not.
  8. dgw

    dgw LawnSite Bronze Member
    from OH
    Messages: 1,008

    thanks for the test

    i have wondered about this

    mainly because the clash of schedule i often run into between overeseeding and applying pre m

    what about siduron ?
  9. dgw

    dgw LawnSite Bronze Member
    from OH
    Messages: 1,008

    i have too, but with scratching the soil or adding new

    i want new seed and CG protection

    IRRITECH LawnSite Senior Member
    Messages: 999

    If that's true, then why is Dimension labeled for grassy weed control?? i.e. Crabgrass

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