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when should preemergent be applied?

Discussion in 'Pesticide & Herbicide Application' started by wowmowwow, Jan 8, 2007.

  1. wowmowwow

    wowmowwow LawnSite Member
    Messages: 209

    spring is around the corner and i wont to get a head start on killing the unwanted stuff. i have a nice thick fescue yard with little clover. and i shop at LTD/southern states, fyi.
  2. VO Landscape Design

    VO Landscape Design LawnSite Senior Member
    Male, from Mt. Pleasant Ia.
    Messages: 365

    My teacher at school burned it into our heads.....when the Forsythia are blooming put down pre-emergent.
  3. garydale

    garydale LawnSite Senior Member
    Messages: 813

    When forsythia are blooming is a good tip.
    However get it down before the blooms start to fall off.
    The forsythia are telling you the soil temperature is around 50 degrees.Thats when seed starts to germinate.
    Use "dimension" to get some post-crab control if timing is late.
  4. ThreeWide

    ThreeWide LawnSite Bronze Member
    Messages: 1,116

    In the South where we do not typically have frozen soil, preemergent can be applied at virtually any time of year.

    Regardless of when you apply, the biggest factor is understanding the length of control needed. You could apply enough preemergent to cover an entire season, or you can make two applications at a reduced rate. This depends on what type of preemergent you use, as each has different rate requirements.

    Take Barricade for example on Fescue. You want the preemergent to wear down by August, as you typically will overseed in the early Fall. You can apply about 1-1.25 lbs AI per acre now, and that will cover you nicely. You could also do two applications, now and April at 0.5 lbs AI/acre.

    The biggest mistake made by applicators with preemergent is determining the actual rate of product per thousand square feet. You have to know the actual AI of the product you are applying to determine that. Barricade is normally sold in AI amounts such as 0.25% and 0.37% for example. Each of these would have a different rate when applying.
  5. khutch

    khutch LawnSite Senior Member
    Messages: 495

    Always good advice from TurfUnlimited!
  6. carcrz

    carcrz LawnSite Silver Member
    Messages: 2,085

    What would you recommend here in the Midwest though. This weather is crazy the last couple years & it seems like there are more weeds than there have been in the past. It always seems like it jumps from 30* to 60* overnight. I was thinking about going out early to mid-February this year to see if I could beat the heat, but wasn't sure if that was a good idea or not. I am also thinking about doing the 1-step pre-emergent instead of 2. Do they work about the same, just 1 less step?
  7. ArizPestWeed

    ArizPestWeed LawnSite Bronze Member
    Messages: 1,457

    Don't understand what you are writing here .

    The lable states the rate in ounces of material per 1K sq ft .
    Are you stating something different ??
  8. ThreeWide

    ThreeWide LawnSite Bronze Member
    Messages: 1,116

    Perhaps Lesco does a good job with the labels.

    But where I purchase Barricade the label on the bag does not provide different app rates, only maximum amounts. My point was that the labels do not often provide different rates based on the length of control you need.

    Too often preemergents are under-applied and then the applicator is disappointed in the results.
  9. ArizPestWeed

    ArizPestWeed LawnSite Bronze Member
    Messages: 1,457

    It has been awhile since I have read a Bassicade lable , however , all other lables state at least 2 levels of control .

    Here's a Barricade lable , hope it opens up
  10. lilmarvin4064

    lilmarvin4064 LawnSite Senior Member
    Messages: 757

    ariz, turfunlimited is talking about granular.

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