Tenacity and POA Triv (rough stalk bluegrass)

Discussion in 'Pesticide & Herbicide Application' started by RRHAMMONS, Apr 16, 2011.

  1. RRHAMMONS

    RRHAMMONS LawnSite Member
    Posts: 142

    Has anyone had any success controlling POA TRIV using Tenacity? Please share any information, ie rates, additional herbicides-such as turflon ester, and timing. Thanks.
     
  2. RRHAMMONS

    RRHAMMONS LawnSite Member
    Posts: 142

    Anyone know if it will control POA TRIV?
     
  3. mishmosh

    mishmosh LawnSite Member
    from OH
    Posts: 45

    I have seen one study where control was listed as only 30%. Another just says it is "damaging" to PT. I would like to see what kind of effect the same protocols used for poa annua has on Poa trivialis, ie. multiple low dose, short interval fall applications. PT does turn white but seems to outgrow the effect easily.
     
  4. RRHAMMONS

    RRHAMMONS LawnSite Member
    Posts: 142

    I think I will try 5oz/acre, 2-3 apps three weeks apart starting in May on PT. Do you know which university did the trials?
     
  5. JoJo1990

    JoJo1990 LawnSite Member
    Posts: 244

  6. RRHAMMONS

    RRHAMMONS LawnSite Member
    Posts: 142

    I sprayed my POA Triv one week ago today. PT is starting to show signs of bleaching in the middle of the the stem and growth has slowed down substantially. The PT has changed about 2-3 shades lighter green than it was previously. I can easily identify all of the patches of PT now. Also, showing whitning on most all of the other wild grasses such as goosegrass and Poa Annua. No whitening on fescue so far. I was supprised at all of the other grasses it is working on in my lawn. I thought my lawn was mostly fescue beside the PT. I guess the whitening really gives you perspective on the amount of other grassy weeds that are lurking in your lawn! Anyone else seeing any results.:clapping:
     
  7. mishmosh

    mishmosh LawnSite Member
    from OH
    Posts: 45

    Amy Fouty, CSFM, Michigan State

    We have battled for many years, like most in our spring and fall with the cloudy, damp climate here in Mid Michigan. I have worked with our turf department here on campus for many years, Dr. Calhoun, our weeds specialist, and his research technician, Aaron Hathway, for viable options to rid us of Poa annua and Poa Trivialis. Until this season I had been weary of the “latest and greatest” products for Poa control. I am a very conservative grass grower and have been skeptical of many products. We first conducted a trial with Velocity and Tenacity at different rates and intervals of applications in the south end zone of Spartan Stadium. We determined from these trials in the spring we could use fewer products with repeated applications.

    We made our applications to Spartan stadium field in mid-June, which consisted of taking 1oz/acre rates and making five applications, one application every 3-4 days, to equal one 5oz/acre total. The repeated applications at the low labeled rate provided us with an excellent reduction of Poa annua, Poa trivialis, and Common Bermuda (on the practice football test area). Throughout the 14-day application process we seeded Kentucky bluegrass, aerated, and topdressed the playing surface. As both Poa’s browned out in weeks 3-4, we had numerous seedlings surfacing and thriving and by week 6 you could not tell we had done anything.

    We reduced our “weedy grasses” significantly but not completely with these applications. The existing Kentucky bluegrass remained healthy with no reduction in root density or rhizome growth. In areas we had solid Poa annua it has been reduced by at least 50% and now has Kentucky bluegrass thriving within those areas. I believe with repeated treatments this is a great tool in the tool box to combat Poa annua and maintain safe and consistent playing conditions.

    Using Tenacity positively benefited all of our fields. It is our hope that we were able to show another tool to help achieve a uniform and safe playing surface for the athletes that use our facilities. As you can see we all used Tenacity at different times of the growing season with slightly different application rates and timing. We all had great success. Please don’t hesitate to contact any of us on more details using Tenacity.
     
  8. MyPoorLawn

    MyPoorLawn LawnSite Member
    Posts: 22

    What are you guys paying for the 8 oz bottles ?
     
  9. mdlwn1

    mdlwn1 LawnSite Silver Member
    Posts: 2,443

    Most of this is emphasized to poa annua.
     
  10. mishmosh

    mishmosh LawnSite Member
    from OH
    Posts: 45

    $50 at EH Griffith
     

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