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Three Way (Trimec) on St. Augustine

Discussion in 'Pesticide & Herbicide Application' started by Williams Services, Apr 18, 2005.

  1. Williams Services

    Williams Services LawnSite Senior Member
    Posts: 269

    I'm not really up on St. Augustine, as it's sort of peppered in this area, not a lot of folks have it ... how do you determine whether the variety of SA to be treated is Floratam, so you know whether to use three way/trimec or atrazine?
  2. Ric

    Ric LawnSite Fanatic
    Posts: 11,956


    Your area should have a lot of Bitter Blue because it is more cold tolerant than Floratan. It is very hard to tell the two apart. They are both very broad leaf. One very good clue is Bitter Blue will be a better shade of blue green color. Floratan is no longer resistant to chinch bugs. Atrazine should take care of broad leaves in both with out any trouble. Three way should be applied at half rate on both.
  3. Williams Services

    Williams Services LawnSite Senior Member
    Posts: 269

    Thanks! I did some digging and found that we most likely will -not- have floratam up here, due to its being highly susceptible to winter kill and very shade intolerant. I'll follow your advice and see where it lands me. :D

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