soil tempature

Discussion in 'Pesticide & Herbicide Application' started by redbuckcavs, Mar 26, 2010.

  1. redbuckcavs

    redbuckcavs LawnSite Member
    from indiana
    Messages: 135

    Is there a university website that updates the current soil temp throughout the ohio-ind region. Once the calendar hits April the phone will go crazy saying WE ARE TOO LATE to apply crabgrass control. I know I can use my own soil gauge. However, I would like to direct the homeowner to a University site so they know the temp is still colder thaen they think----Thanks
  2. Young Bros

    Young Bros LawnSite Senior Member
    Messages: 710

  3. DA Quality Lawn & YS

    DA Quality Lawn & YS LawnSite Fanatic
    Messages: 9,265

    Thats exactly what I use. I look at the 5 day map (am hoping that means 5 day avg??)
  4. starry night

    starry night LawnSite Gold Member
    Messages: 3,227

    Thanks for the link, guys. Just what I needed. (Organics here.)
  5. BS1190

    BS1190 LawnSite Member
    from midwest
    Messages: 168

    I believe here in Iowa the 3t manual states that crabgrass control needs to be applied before soil temps are above 65 degrees. Does that sound about right?
  6. starry night

    starry night LawnSite Gold Member
    Messages: 3,227

    When the forsythia starts to bloom, that's the same time for the first crabgrass seed to grminate.
  7. BS1190

    BS1190 LawnSite Member
    from midwest
    Messages: 168

    so the preventer needs to be put before that.

    Back before I did lawn care and I did weed and feed on my yard. I always started with crabgrass preventor in may and it always seemed to work.

    I've also that red bud trees are a better reference then forsythia. Forsythia blooms according to air temputeres and red rud to soil temputers.
  8. starry night

    starry night LawnSite Gold Member
    Messages: 3,227

    That may be true but the forsythia are close enough. Ohio State University has a website for "degree days" which has a low list of bloom times of various bushes and trees coupled with when certain pests hatch or weeds germinate.
    I would refer you to it but it's only for Ohio. Maybe your university might have something similar. Maybe you can checkout "degree days."
  9. grass4gas

    grass4gas LawnSite Senior Member
    Messages: 584

    What I generally do is make sure that the "thin" lawns get the pre-emergent right out the door. I will then go back in on my next app and put down a second shot of the same.

    Your thicker, denser turf can wait longer for that first app, and you can be fairly sure that you will have excellent control, baring any factors, such as disturbing of the soil that would break the barrier, or improper application.

    I don't worry about the timing of the forsythia...hell some were blooming in late February.
  10. tombo82685

    tombo82685 LawnSite Senior Member
    Messages: 288

    i've always hear you want to apply crabgrass control between forsythia and lilac bloom.

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