Herbicide solution too old?

Discussion in 'Pesticide & Herbicide Application' started by RigglePLC, Jun 20, 2011.

  1. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,664

    I recently did some experiments with Gordon's T-Zone herbicide.
    I was surprized that it was fully effective even when used 39 days after mixing. I used about an ounce per gallon.

    So perhaps (if confirmed) this means we need to worry less about disposal if a herbicide solution remains in the tank for longer than expected. There was no fertilizer mixed with it. No amonia or strongly alkaline conditions.
  2. greendoctor

    greendoctor LawnSite Fanatic
    Messages: 9,975

    I know that sulfentrazone, 2,4-D, dicamba and triclopyr are stable in neutral-mildly acidic solutions.
  3. Ric

    Ric LawnSite Fanatic
    Messages: 11,969

    I have seen some Herbicide appear to of gotten stronger the longer they had been mixed. Most herbicides like an acid carrier however some like it alkaline. Certainty is one that I add Baking Soda to.


    Nothing to do and all day to do it gets old after a while. Either get a hobby or go back to work because you haven't taken a day off Lawnsite since you retired.
  4. greendoctor

    greendoctor LawnSite Fanatic
    Messages: 9,975

    True. I know of one banana that keeps Certainty mixed in a 2 gallon hand sprayer. He had really inconsistent results. When he first mixed it, it would work ok, thereafter, it was a crapshoot whether it would burn the grass or fail to kill the weeds. A good reason why I will not keep hand cans or backpacks with premixed solutions, every lawn gets a fresh mix.

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