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Herbicide, spurge, heat test

Discussion in 'Pesticide & Herbicide Application' started by RigglePLC, Jul 18, 2013.

  1. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,543

    I tested five herbicides against spotted spurge. Quicksilver,T-Zone, Speedzone, Surge, and a generic three-way.
    Speedzone was most effective; T-zone was a close second. The remaining products were only fair.

    I tested the above products at high rates at 90 degrees; it was 94 as a high in the next two days. I sprayed a half sq foot spot 6 times for each product . Temperature was 94 as a high in next two days. There was no sign of injury to the grass which was in light shade. Grass species was fine fescue and bluegrass.

    What is your experience? Have you caused damage from herbicide at high temperatures?
  2. DA Quality Lawn & YS

    DA Quality Lawn & YS LawnSite Fanatic
    Messages: 9,219

    No herbicide damage.....but sure shootin had some damage from PG tracks on semi dry lawns at higher temperatures. Clearly defined tracks in white, wherever I drove. If it is anything above 85 and the turf is remotely dry, I am not spraying period. Lesson learned.
  3. Chilehead

    Chilehead LawnSite Bronze Member
    Male, from Stockbridge, GA
    Messages: 1,956

    Did you use a spreader/sticker in your mix? I generally use Surge (only 1 oz./gal. in this heat) with a bit of spreader/sticker, and usually mix in some lawn disease control chems.
  4. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,543

    Those brown tire tracks are called "heat tracks". Mysterious--actual cause is unknown--it happens when green grass is beginning to wilt and tires roll over it. Nothing to do with herbicide or fertilizer. It looks ugly when it is caused by mowing.

    I am still not sure if there is a point when it is too hot for herbicides, if so which herbicides? If so which species of weeds? What about too cold? It just works slower when it is cold...right?
  5. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,543

  6. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,543

  7. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,269

    Speedzone at 1oz per gallon in backpack damages burmuda real bad above 90F.
  8. TurfWerks

    TurfWerks LawnSite Senior Member
    Messages: 322

    I leave my surfactant out in hotter weather.. Ive never seen yellowed permagreen tire tracks in a lawn as far as I can remember.. Ive sprayed Speedzone, vessel, etc... all above 90 degrees with some minor yellowing..
  9. jbturf

    jbturf LawnSite Bronze Member
    Messages: 1,501

    starting to see some ugly heat tracking here, mostly unirrigated turf, from mower tires, its kinda funny looking 2 lines close together then 3' space,

    we finally got rain yesterday like 2.5 inches
  10. DA Quality Lawn & YS

    DA Quality Lawn & YS LawnSite Fanatic
    Messages: 9,219

    Good rain.

    Luckily with heat tracks, some good rainfall or watering and a shot of N and it goes away within a couple weeks.

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