Leftover Q4 and the Heat

Discussion in 'Pesticide & Herbicide Application' started by lawnspecialties, Aug 10, 2009.

  1. lawnspecialties

    lawnspecialties LawnSite Silver Member
    Messages: 2,524

    I have about 30-40 gallons of Q4 still in my tank sprayer from about two weeks ago. We've had some fairly hot days and even today it's supposed to hit around 100.

    Will that cause any adverse effects to the mix or can I still spray it later this week? Obviously, I'll spray when temperatures are much lower but I was just concerned about it sitting there in the hot tank for now.
  2. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,665

    No one knows. And it is never on the label. And you will not find that info from any university information.

    Spray it. Let us know what happens.

    I could point out that I had a small amount of liquid weed control, mixed with urea solution in my tank last year. It rode around in the truck for about a week, with temps about 85 in the day. When I used it, it caused a slight burn to the grass. Had to reseed a few spots. When I checked the tank -it had a strong amonia odor. I am thinking there was about 1000 sqft worth of solution trapped in the 300 foot hose. I should have recirculated that into the tank before starting. Of course, it is not legal to dispose of the old solution. Not sure if the herbicide worked ok or not.
  3. SimonCX

    SimonCX LawnSite Senior Member
    Messages: 731

    Try calling pbi/gordon and see what they say, they would know better then any of us.
  4. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,665

    I am meeting with Blaine Pinkerton of Nufarm tomorrow--I will ask him.
  5. lawnspecialties

    lawnspecialties LawnSite Silver Member
    Messages: 2,524

    Please let us know what he says.
    Thanks :)
  6. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,665

    The guy from Nufarm was not much help. "We don't make Q4, not our product." Vague answer about how it would be less effective depending on the pH of the water. I asked if it was a problem if the pH was to high or too low. He said neither--it should be in the middle range.

    So did you try it? Did it kill the weeds? Kill the grass? Did the fertilizer work?
  7. indyturf

    indyturf LawnSite Bronze Member
    from Indy
    Messages: 1,901

    probably was the urea that caused the burn. it can turn to ammonia in the heat. the Q4 would loose its effectiveness but wouldn't think it would become volatile
  8. Chilehead

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

    I would not apply it if over 90 degrees.
  9. lawnspecialties

    lawnspecialties LawnSite Silver Member
    Messages: 2,524

    I have a customer who now lives in California. I'm just keeping their house here mowed as a favor job, but now it's been on the market for two years and the lawn is really starting to look neglected. They just signed up for full-service maintenance. I'm going to spray the leftover Q4 tomorrow.

    If the Q4 cause any problems, I'll be able to repair it next month since I know I'm reseeding it. It can only cause so much problem since the yard is getting so weed infested anyway. Tomorrow will be a cool day so I'll give it a shot. I guess I'll know next week if any adverse effects occur.

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