To skip or not to skip

Discussion in 'Pesticide & Herbicide Application' started by ProLawns, Jan 4, 2009.

  1. ProLawns

    ProLawns LawnSite Senior Member
    Messages: 476

    I've applied pre-emergent on some of my long term customers for over ten years now every spring and haven't seen any crabgrass. I'm contemplating not doing a pre-em app this season on those lawns. If those lawns have crabgrass seeds that haven't germinated because of the years of pre-em will they germinate now or have they lost their potency?
  2. LushGreenLawn

    LushGreenLawn LawnSite Silver Member
    Messages: 2,120

    If it were me I would go ahead and apply. Seeds come from all over, wind and birds are big contributors, as well as Lawn Mowers going from Lawn to Lawn if they don't mow their own grass.

    If you risk it, and have a breakthrough on all those accounts, then you are going to be spraying expensive post emergent chemicals for control.

    Its really not that much more to spread a fert with a crabgrass pre-emergent than it is to spread fert without it.

    Out of curiosity, what chemical do you use?

    DLAWNS LawnSite Fanatic
    Messages: 5,780

    I agree with Lushgreenlawn. I would go ahead and apply.
  4. mngrassguy

    mngrassguy LawnSite Silver Member
    Messages: 2,167

    It all depends on how well trained your customers are. If they understand the basic principals of IPM, you could cut back on pre-treating for weeds and using post controls. BUT....most won't understand and will drop you like a hot potato because they will think you aren't doing your job.

    Keep in mind, pre's control a lot more than just crabgrass.
  5. ted putnam

    ted putnam LawnSite Platinum Member
    Messages: 4,704

    You hit the nail on the head! :clapping:

    I don't know about other areas of the country but with our warm, humid, rainy environment I wouldn't dare skip applying a pre-emergent. I feel that by applying a pre-emergent properly, you are furthering IPM through prevention. JMO
  6. ProLawns

    ProLawns LawnSite Senior Member
    Messages: 476

    Thanks for your input guys. I'll take your advice. I wasn't thinking about all the other annual weeds that it blocks. On the chemical that I use; for years I used two apps of pre-em but last year I did one app of Barricade. I'll probably use the Barricade again this year.
  7. garydale

    garydale LawnSite Senior Member
    Messages: 813

    A couple of quick questions on Barricade.
    Is it yellow staining like Pre-M?
    Do you do split appl. with Barricade?

    I am concidering replacing my split appl. of Dimension with one appl. of Barricade. Any thoughts on that change would be appreciated.
  8. Turfdoctor1

    Turfdoctor1 LawnSite Senior Member
    Messages: 707

    my experiences is very, very poor control of broadleaf weeds, annual bluegrass, etc., with Barricade. IMO, it's pretty much good for crabgrass, foxtail, and other large annual grassy weeds (even pretty poor on goosegrass).

    What other annual weeds do you have good luck controlling with pre's? And, do these pre's include Barricade?
  9. ted putnam

    ted putnam LawnSite Platinum Member
    Messages: 4,704

    Turfdoc. Last year was the first year I've ever used prodiamine for my pre-emerg. I noticed there were broadleaf weeds that broke through that I never had a problem with when using pendimethalin(what I always used in the past). I was actually concerned about it and was considering going back. It's true, by reading the label, obviously the spectrum of broadleaf control is less with prodiamine. Cost is comparable between the 2. The smell and mess factor came in to play for me. Prodiamine is so much better to work with in those areas. Some of the breakthroughs I attributed to the 22.5 inches of rain we got between March 1 and April 15. I'm going to give it a shot again this year and hopefully we'll have a "normal" yearand I'll be able to better judge. I still wouldn't skip using some type of pre-emerg. JMO
  10. ProLawns

    ProLawns LawnSite Senior Member
    Messages: 476

    Just thought i'd save a few bucks by skipping but it's probably not worth the chance. Barricade doesn't stain and you can adjust the length of control by the amount you apply (app rates are on the label). So for one time apps it works better for crabgrass. I can't say if it's better for broad leaf control I haven't experimented enough but if the label says it doesn't control as many then it probably doesn't. I seem to have more issues with winter annuals than summer. I guess the spring pre-emergents are helping.

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