Two applications of pre-emergent

Discussion in 'Pesticide & Herbicide Application' started by jondcoleman, Aug 12, 2008.

  1. jondcoleman

    jondcoleman LawnSite Member
    Messages: 181

    I was at one of my larger properties yesterday and I am concerned about the amount of crabgrass. Right now, my program includes only one app of pre-emergent in early spring. Do most of you apply again in late spring/early summer?

    Anybody apply pre-emergent in the fall or late summer? Thanks!
  2. TforTexas

    TforTexas LawnSite Senior Member
    Messages: 260

    We do down here, but in your neck of the woods a fall app won't do much of anything for crabgrass. Might prevent a little Henbit, Chickweed or Poa Annua but that's about it.
    Depending on the Preemergant you use, determines how many apps you need in the Spring. Pendimethalin requires 2 apps where Stonewall (Barricade) or Dimension you can get away one.
  3. jondcoleman

    jondcoleman LawnSite Member
    Messages: 181

    I use dimension. Maybe I applied too little on this property?
  4. NINER

    NINER LawnSite Member
    Messages: 204

  5. RAlmaroad

    RAlmaroad LawnSite Silver Member
    from SC
    Messages: 2,257

    Back when I was using Dimension, we put down a strong application(.21) between February 15 and March 15 at full strength according to bag. Dimension will last up to around 90 days or a little longer for strong applications. Somewhere around the end of May-1st week in June, another lighter .10 per bag instructions was put down. These would take care of the summer seeds. Crabgrass in Tennessee becomes active in July. This split application worked well. The only problems with Dimension is the root pruning. This did cut down on the number of weed treatments to only one in June and a few spots later in the year. The TN growing season or first frost could be as early as the end of September or 1st of October.
    Long dissertation short--Yes two application are needed.
    Now the SC properties--all together different. All liquids and Gallery
  6. n-green

    n-green LawnSite Senior Member
    Messages: 367

    Dimension .10 X 2 @ 4lbs. per m2ft in spring.
  7. jbturf

    jbturf LawnSite Bronze Member
    Messages: 1,503

    excess watering/rainfall has proved to shorten the effective control of
    some products like dimension,

    im curious if split apping or two apps of pre-emergent- with 2 different
    products would be more effective than just 1 product
    such as pre-m for 1st and dimension for 2nd
  8. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,806

    There is no money to support this type of research. Very good question. Nobody knows.
  9. b121774

    b121774 LawnSite Member
    Messages: 207

    I do 2 full apps., one early Feb. and again early May with pendulum or dimension. Only do fall apps. for bad poa problems.
  10. mngrassguy

    mngrassguy LawnSite Silver Member
    Messages: 2,167

    2 apps Dimension .10 @ 4lbs/k in spring, 4-5 weeks apart.

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