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Preemergent in the fall

Discussion in 'Pesticide & Herbicide Application' started by jtrice11, Aug 25, 2005.

  1. jtrice11

    jtrice11 LawnSite Senior Member
    Posts: 380

    Here in Minnesota if you are going to put down a fall application of Pre emergent what is the best time?
     
  2. GreenUtah

    GreenUtah LawnSite Senior Member
    from SLC, UT
    Posts: 866

    Regardless of the area, you need to decide what your target of control is, when it's germination time will be and how long the effective window for your pre-emergent will be. Under most conditions, at common rates, most pre-emergents have an effective window of 90-120 days. If your target is crabgrass that will germinate next June, applying 7 months prior will do what? If you have a different target in mind, just work backwards with your effective window and you'll have your answer. Pre-emergent is too expensive to waste.
     
  3. Pro Lawn LLC

    Pro Lawn LLC LawnSite Member
    Posts: 18

    I don't know about pre-emerge for the north, but if you base these types of applications on soil temps. you won't go wrong. For example - figure out at what soil temperature your target weeds germinate and just make sure you have your pre-emerge out slighty before the temp reaches that point. Best of luck.
     
  4. Grassmechanic

    Grassmechanic LawnSite Silver Member
    Posts: 2,697

    Actually, MSU did a study on fall applications of Pre-emergents. Dimension did very good on the test for crabgrass control the following season. This was done on cool season turf.
     
  5. wriken

    wriken LawnSite Silver Member
    Posts: 2,154

    Wonder when they put it down in the fall, also wondering when the soil reaches, what is it for crab, 55 degrees? I'm thinking of putting down pre, this fall if I can find out when.
     
  6. GreenUtah

    GreenUtah LawnSite Senior Member
    from SLC, UT
    Posts: 866

    But what were the soil conditions, density of the stand, fertilization schedule, available moisture and the window of when the soil heated up the next spring for cg germination? Did it perform the same as if it had been applied in the spring? What window if effectiveness does Dimension claim? Those are a few of the questions I would want answers to before gambling with my customer base that provides for my family and my employees families. But hey, that's me. I'm an agronomic conservative..lol
     
  7. teeca

    teeca LawnSite Bronze Member
    Posts: 1,202

    is there a reason your putting down pre-m in the fall Vs. in the spring? being your even farther north then me in Indiana, why would you wast the money in the fall w/ pre-m. when you could put down a 46-0-0 to help the grass w/ storing the carb's it needs for the winter, then apply pre-m in the spring. i think you would be better off doing a weed spray in the fall to kill the winter annuals, this has been proven time and again to be the most effective time to control weeds.
     
  8. wriken

    wriken LawnSite Silver Member
    Posts: 2,154

     
  9. teeca

    teeca LawnSite Bronze Member
    Posts: 1,202

    purdue univ. is where i learned this. they have done all kinds of studies on when to spray, and say fall gives the best results hands down, of course you will still need to spray the dandy's in the spring though. the problem i have with fall pre-m's, other then the HIGH cost of product, is that alot of people overseed in the fall, nothing worse then killing $50+ worth of seed. i apply pre-e in the spring at 1/2 rate on round 1 (granular), then the other 1/2 on round 2 along w/ weed and fert (liquid). i used dimension only (insted of pendulum) for the first time this year and have to say it kicked a** ! with pendulum i had good coverage on crabgrass, but fox tail was a problem, with dimension, not a sign of any yet!! (knock on wood)
     
  10. stumper1620

    stumper1620 LawnSite Bronze Member
    Posts: 1,889

     

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