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Expect crabgrass breakthrough in the Northeast.

Discussion in 'Pesticide & Herbicide Application' started by phasthound, May 13, 2020.

  1. phasthound

    phasthound LawnSite Fanatic
    Messages: 6,310

    JLSLLC and The Green One like this.
  2. Hineline

    Hineline LawnSite Bronze Member
    Messages: 1,118

    After last years two month spraypalooza I put down.38 prodiamine at 4.25 bags per acre and didn't start until April 15. I hope that's good enough.
     
    The Green One and zlandman like this.
  3. OP
    OP
    phasthound

    phasthound LawnSite Fanatic
    Messages: 6,310

    Time will tell.
     
  4. BigJlittleC

    BigJlittleC LawnSite Fanatic
    from Chicago
    Messages: 8,284

    Why would you say such a thing. Take it back.
     
    Marine03112, zlandman and gcbailey like this.
  5. Wye Oak Tree

    Wye Oak Tree LawnSite Fanatic
    Messages: 6,683

    I'm just seeing the first tiny leaf of crabgrass emerge here in Southern RI.
    Several weeks ago daily temps were in the mid-low 40's.
    Since then it has been in the mid-upper 50's and more or less sunny enough to warm soil temps up enough for germination.

    Vile weed it is!
     
  6. zlandman

    zlandman LawnSite Bronze Member
    from Ohio
    Messages: 1,208

    Great. Just finished round 2 today with no additional pre. Preemergent round 1 was applied in the final "optimum " days per GDD Tracker. Hope that helps.
     
    hort101 likes this.
  7. The Green One

    The Green One LawnSite Member
    Messages: 40

    Hindline,

    At that 0.80 Rate A.I per Acre, you should be fine. If you had applied at .65 ai, and had some late summer very heavy rainfalls, concern would be an option.

    Remember that cooler soils also have lower microbial activity, and that is the key player on Prodiamine degradation.

    GDD base 50 is far later than any season I recall, and soil temps have remained below 50F at 7am in Central N.J. even as of today.

    IF folks went out too early with their Pre and A.I. was low, you should consider a split app, to cover your 6 o'clock for the Nasty crabgrass.

    No disrespect of course to Barry's post or the Cornell Expert.

    Check your rates and timing people, if you are unsure. Better safe than sorry.
     
  8. OP
    OP
    phasthound

    phasthound LawnSite Fanatic
    Messages: 6,310

    That's good info Green One.
     
    The Green One likes this.
  9. CHARLES CUE

    CHARLES CUE LawnSite Gold Member
    Messages: 3,072

    Well i am glad i am in the south I seen crabgrass back in the first of april but we have had many frost in the last 5 weeks
     
    The Green One and phasthound like this.
  10. grass4gas

    grass4gas LawnSite Senior Member
    Messages: 939

    Last year I upped my prodiamine to .42AI at the 225 lb/ac rate. Same this year. Much better results. Prior to last year ,I was using a .37AI prodiamine
     
    zlandman likes this.

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