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henbit not being killed

Discussion in 'Pesticide & Herbicide Application' started by wrestlingcoach, Mar 23, 2004.

  1. wrestlingcoach

    wrestlingcoach LawnSite Senior Member
    Posts: 251

    new in the biz

    sprayed several lawns and using trimec

    sprayed henbit (some are 6 to 10 inches tall) it is not being killed after 2 weeks.

    weather has been 40's at night to low 70's during the day

    other weeds are being killed

    using the dosage 2.5 pints per acre
    sprayer calibrated at 2 gallons per minute
    so 2.5 pints per 86 gallons

    any ideas or help
  2. TSM

    TSM LawnSite Senior Member
    from MA
    Posts: 711

    henbit can be stubburn, i'd up your rate of trimec.

    you say you're doing 2.5 pints/acre?
    if my math is correct thats 0.9oz per 1000sf
    kick it up to 1.5oz per 1000sf, which is 4pints/acre?
  3. weedmaster

    weedmaster LawnSite Member
    Posts: 20

    I am also new in Oklahoma. I am using Trimec at 4 pints per acre with 1quart of Surf King per acre. Also 4 pints of Pendimethalin per acre. Henbit is fried but it took a while on the February apps.
  4. wrestlingcoach

    wrestlingcoach LawnSite Senior Member
    Posts: 251

    also using 2 pints of surf king per acre
    4.8 pints of pendimethalin

    so i need to up the dosage
  5. greenerpastures

    greenerpastures LawnSite Member
    Posts: 160

    henbit that is 10" is near flowering stage and has pretty much run its course. A lawn mower is the best prescription. You can hammer it with 1.5 oz of trimec and it will eventually die about the same time it is going to die out anyway. Simazine in nov. works wonders on henbit down south.
  6. sprayman73703

    sprayman73703 LawnSite Member
    Posts: 79

    If you hit it with about a pint and a half of roundup per acre and 2 to 3 oz. (and only 2 to 3 oz.) it will be killed in about two weeks. Plus i wouldn't up your surfking rate you only need a few ounces per acre unluss you are running large amounts of water per acre i.e. 50 or more. I agree with greener pastures, the november application of a preemergent like simazine will do more good than anything to stop it before it ever showes up. I also think that you are using plenty of pendulum, unless youare only making one pass peer year. hope my thoughs could help for what they are worth, good luck.
  7. wrestlingcoach

    wrestlingcoach LawnSite Senior Member
    Posts: 251

    after talking to the estes guy
    I am going to cut the pendulum to 3.6 pints per acre so I can do a split app

    and go to 4 pints of trimec until it the heat arrives

    i agree on the simazine I sprayed my yard, mom's & mother-in-law's with it and what job it did. the only patches were where a bunch of leaves were piled up along the fence
  8. Fvstringpicker

    Fvstringpicker LawnSite Fanatic
    Posts: 7,603

    A little late in the season now but next year switch to ester formulation.

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