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  1. #1
    Join Date
    Nov 2006
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    Tulsa, OK
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    Default Any Way To Get Rid Of Crabgrass But Keep Weeds

    I live in town in a neighborhood. I've let my lawn go wild, and I now have lots of clover and dandelions for the bees. The lawn generally looks okay too.

    However, I've also gotten invaded with crab grass. No matter how you slice it, that stuff is ugly and spreads like crazy. Also, I use an old fashioned reel mower, and it cuts everything but he crabgrass. Also, the crab grass has some serious roots, and it's pretty hard to pull up without leaving some roots behind that sprout again. I've tried spraying just the crab grass with Roundup. That will kill it sometimes, but it does more to the surrounding plants than it does to the crabgrass.

    I figure it's impossible, but it nevers hurts to ask: Is there any chemical method for controlling crab grass that would not hurt other weeds?

  2. #2
    Join Date
    Apr 2008
    Location
    Fair Grove,MO,USA
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    1,665

    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    If or when you come up with the solution to the eradication of crabgrass (and i'll through in bermudagrass with it) without killing anything else around it, keep me in mind. I would like to buy stock in it. Believe it or not but i think the bermudagrass is the worse of the two. I've got both. Good luck. Jack

  3. #3
    Join Date
    Nov 2006
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    Tulsa, OK
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    3,552

    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    The base of my lawn is bermudagrass. Believe it or not, that is what most unshaded lawns are SUPPOSED to be around here. The only reasonable ways to keep a garden in a bermuda lawn are either raised beds or spraying the permiter with roundup.

  4. #4
    Join Date
    Jun 2002
    Location
    parker county, tx
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    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    I love bermuda except in the garden.

    I don't try to control any weeds in the lawn here because the place is too large, and it's too time-consuming, plus none of the neighbors care since you can't see our lawn from the road. From reading about crabgrass, it sounds like controlling it is difficult. The link below has a few ideas. It sounds like pre-emergent treatment would be a good idea, and if it's timed well, it will probably help you keep your beneficial weeds.

    http://www.grounds-mag.com/mag/groun...grass_control/

    Dimension (dithiopyr) provides pre-emergence and early post-emergence crabgrass control. Dimension may stunt growth of crabgrass when applied after tillering but generally will not provide acceptable control. Therefore, you should apply this compound prior to tillering. An advantage of Dimension is that can provide three or more months of residual crabgrass control. Crabgrass is one of the few weeds Dimension will control post-emergence. You could control crabgrass for most of the growing season with one Dimension application appropriately timed after emergence.
    Dimension is a root inhibitor, and works by affecting cell division in grass roots. You should only apply it to established turf, because established turf has a well-developed root system. You can apply this herbicide to a wide range of cool and warm-season turfgrass species. Check the label for sensitive cultivars, especially bentgrass and fine fescue. Many ornamentals tolerate Dimension, and you can use this compound for weed control in ornamental beds as a directed spray.Drive (quinclorac) is a unique herbicide. When looking at its weed control spectrum and the injury symptoms it causes, it appears to be a hybrid between a grass herbicide and a broadleaf herbicide. It controls crabgrass both post-emergence and pre-emergence, with a month or more residual control after treatment. Drive will not control all broadleaves, so combinations with 2,4-D and other broadleaf herbicides will increase the number of broadleaf weeds controlled. Drive can be less effective when applied during crabgrass tillering, so pretillering applications would be the preferred time to apply the chemical. Adding a methylated seed oil as an adjuvant improves leaf uptake and, thus, weed control.
    Drive inhibits cellulose biosynthesis in plants, and may also have other sites of action. Drive can injure susceptible broadleaf plants through leaf or root uptake. Do not use lawn clippings to mulch vegetables or other broadleaf crops because Drive can damage crops like tomatoes. It can cause injury in certain broadleaf ornamentals, so avoid spray drift when treating lawns near flower and shrub beds. Depending upon the turf species, there is flexibility in regards to seeding of turfgrass after a Drive application, and applications can be made to relatively young turf. Drive cannot be applied to certain turfgrass species, such as St. Augustine and centipedegrass.
    The organic arsenicals MSMA and DSMA (various trade names) also control emerged crabgrass in established turfgrass. Generally, multiple applications are required, especially for well-tillered crabgrass. The organic arsenicals can cause yellowing or burning of turf, such as in tall fescue. This injury is temporary and turfgrass will outgrow the damage in a week or two. An advantage to using organic arsenicals is control of sedge species like yellow nutsedge. The organic arsenicals are also sold commercially in combination with broadleaf herbicides like 2,4-D. This is one-stop shopping, if you will, because these mixtures will suppress or control a wide range of broadleaf, grass and sedge weeds. A disadvantage to these combinations is that a given site may only have broadleaf weeds, so the MSMA or DSMA is not required, while other sites may have only crabgrass and, thus, not require the 2,4-D component. MSMA and DMSA do not provide residual crabgrass control, so you must either repeat applications for later-germinating plants or apply a pre-emergence herbicide. Follow label directions in regard to addition of a nonionic surfactant.Acclaim Extra (fenoxaprop) is a post-emergence herbicide with little-to-no soil residual effects. It is primarily used in cool-season turfgrass, and can be used to suppress bermudagrass that has invaded turfgrasses like Kentucky bluegrass and tall fescue. Acclaim Extra will not control any broadleaf weed or sedge species. Post-emergence broadleaf herbicides like 2,4-D, dicamba or triclopyr can antagonize crabgrass control with Acclaim Extra if you do tank mixes. You can avoid this by applying Acclaim Extra first, then waiting a week or two before applying the broadleaf herbicide. Acclaim will control pre-tillered and tillered crabgrass, but higher application rates are required for larger crabgrass plants. You can combine Acclaim Extra with pre-emergence crabgrass herbicides to obtain residual control.
    Acclaim Extra inhibits fatty acid synthesis in sensitive weed species. The old formulation of fenoxaprop, Acclaim 1EC, contained two forms of the herbicide: one that controls weeds and another form that is essentially inactive. The manufacturer was able to synthesize only the active formulation of the herbicide, resulting in lower rates of application for the active ingredient. Acclaim Extra only contains the active form of fenoxaprop. Acclaim Extra can cause temporary yellowing in some grasses like Kentucky bluegrass, but the turf will quickly outgrow any adverse effects. Broadleaf ornamentals are tolerant of Acclaim Extra, so you could also use this chemical for crabgrass control in landscape beds.MIX IT UP

    Why did I mention the mechanism of action for these herbicides? One reason is the occurrence of weed resistance. Some parts of the country have crabgrass biotypes that are resistant to certain post-emergence crabgrass herbicides. To avoid development of herbicide resistance, rotate herbicides with different modes of action. Do not rely on the same herbicide year after year. It would be a good idea to rotate herbicides every three or four years. Because Dimension, Drive, the organic arsenicals and Acclaim Extra all have a different mode of action, any rotation among these chemicals will reduce the potential for crabgrass resistance.
    Lawn care companies have a range of options for crabgrass control, including strictly pre-emergence herbicides, strictly post-emergence herbicides or a program utilizing both options. You should base your choice of a post-emergence crabgrass herbicide on the turfgrass species you will treat, the crabgrass size and the presence of other weed species. Combinations with pre-emergence herbicides will control both emerged crabgrass and provide residual control.
    Jeffrey Derr is a professor of weed science at Virginia Polytechnic Institute and State University (Blacksburg, Va.).

    So many weeds.......so little time.

  5. #5
    Join Date
    Mar 2008
    Location
    Ennis, TX USA
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    5,124

    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    MSMA (Monosodium methanearsonate) will kill crab grass and won’t do much if anything to Dandelions. Also considered to be Relatively Non-Toxic to bees. You need to be careful what you buy though. Most products at the home centers will say MSMA but will also have 2,4-D in it. Which that will kill all the broad leafs and very toxic to bees. Look for a garden center that sells Hi-Yield brand. I think they sell the pure form of MSMA.
    Last edited by Hambone; 10-19-2009 at 12:26 PM.
    Chuck Norris has a grizzly bear carpet in his room. The bear isn't dead it is just afraid to move.

  6. #6
    Join Date
    Jan 2003
    Location
    Kiel WI, USA
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    2,368

    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    Corn gluten meal has been mentioned here and there as a crabgrass preventer. If it doesn't work it will at least provide a dose of nitrogen.

  7. #7
    Join Date
    Dec 2007
    Location
    Tulare County, CA USA
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    1,380

    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    Grass Getter from Monterey, active ingredient Sethoxydim. It comes in a little box with one container of herbicide and one container of spreader.
    My son is allergic to EVERYTHING wind pollinated so I tore out about half an acre of grass and replaced it with white dutch clover. This stuff takes a while to work but it will eventually kill just about all of the blade grass and leave you with a nice broadleaf lawn.

  8. #8
    Join Date
    Jun 2002
    Location
    parker county, tx
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    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    Thanks CP- does it work on nutgrass? That and Johnsongrass are the two grasses that are the scourge of my gardens.
    So many weeds.......so little time.

  9. #9
    Join Date
    Apr 2008
    Location
    Fair Grove,MO,USA
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    1,665

    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    Quote Originally Posted by dragonfly View Post
    Thanks CP- does it work on nutgrass? That and Johnsongrass are the two grasses that are the scourge of my gardens.
    Grandad would put hogs in a patch of johnsongrass with a elec. fence around it. They would root the roots out and eat them. Jack

  10. #10
    Join Date
    Jun 2002
    Location
    parker county, tx
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    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    Quote Originally Posted by brooksbeefarm View Post
    They would root the roots out and eat them. Jack
    And you can get it tilled for free without doing the work yourself.
    So many weeds.......so little time.

  11. #11
    Join Date
    Feb 2009
    Location
    Knox County, Ohio
    Posts
    2,692

    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    I have a cousin whose farms are certified organic. His weed control uses propane torches to burn the weeds in between rows of crops.

    If you watered your lawn, (or after a really heavy dew) you could use a torch to burn the crabgrass without causing much damage to other weeds. The torch will quickly evaporate the water on the crabgrass and fry it, while the water on surrounding plants (not under direct flame) will be protected by the Leiden-Frost effect.

  12. #12
    Join Date
    Apr 2008
    Location
    west point, ms
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    381

    Default Re: Any Way To Get Rid Of Crabgrass But Keep Weeds

    I use Post herb. on my feild peas kills crab grass won't hurt broad leaves.
    Don't think you are on the right road simply because it is a well worn pathway.

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