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Crab Grass #6604824
08/28/19 11:17 AM
08/28/19 11:17 AM
Joined: Dec 2006
Posts: 15,594
MN, Land of 10,000 Lakes
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Trapper7 Offline OP
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MN, Land of 10,000 Lakes
My yard is being over run by crab grass. I sprayed it twice with a product from Bayer that says it kills crab grass, but it doesn't. it did kill other weeds, but didn't phase the crab grass. Has anybody found a way to eradicate this invasive grass?


I don't care how nice the hand soap smells, you should never walk out of the restroom sniffing your fingers.
Re: Crab Grass [Re: Trapper7] #6604837
08/28/19 12:01 PM
08/28/19 12:01 PM
Joined: Dec 2006
Posts: 2,301
Waterville Minnesota
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mudtracker Offline
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Waterville Minnesota
I think it is the cockroach of weeds


WHO MADE THIS MESS ALL OVER MY FLOOR THE MUDTRACKER WAS HERE HE HE HE
Re: Crab Grass [Re: Trapper7] #6604840
08/28/19 12:15 PM
08/28/19 12:15 PM
Joined: Dec 2006
Posts: 2,463
ny
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gcs Offline
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ny
Eh,.. it's green, and fills in the dead spots, it all gets leveled out when you mow, lol

But, not sure how you'd kill the crabgrass without killing all the grass....the pre-emergent stuff works pretty good, but that has to go on before the seeds sprout.

Re: Crab Grass [Re: Trapper7] #6604843
08/28/19 12:20 PM
08/28/19 12:20 PM
Joined: Jan 2007
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S.E. Ohio
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M.Magis Offline
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S.E. Ohio
As far as I know they only effective solution is a per-emergent. Crabgrass is a grass and not a weed so I'm not aware of any crabgrass specific herbicide, only grass specific herbicides. Which as you found out, will kill or affect all grasses.
I never quite understood why it's hated so much? I'll take any green grass I can get.

Re: Crab Grass [Re: Trapper7] #6604848
08/28/19 12:25 PM
08/28/19 12:25 PM
Joined: Dec 2006
Posts: 15,594
MN, Land of 10,000 Lakes
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Trapper7 Offline OP
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MN, Land of 10,000 Lakes
I'm thinking I will have to try a pre-emergent next spring.


I don't care how nice the hand soap smells, you should never walk out of the restroom sniffing your fingers.
Re: Crab Grass [Re: Trapper7] #6604866
08/28/19 12:47 PM
08/28/19 12:47 PM
Joined: Jul 2010
Posts: 2,897
American In the Pyrenees; Fran...
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swift4me Offline
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American In the Pyrenees; Fran...
I've dealt with it a bunch. I think that just like Bermuda grass, crabgrass has rhizomes so pre emergent will only slow the spread.

Here in France our lawns are half grass and half bad stuff. After you mow it all looks good.

Pete

Re: Crab Grass [Re: gcs] #6604871
08/28/19 12:53 PM
08/28/19 12:53 PM
Joined: May 2009
Posts: 15,540
Champaign County, Ohio.
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KeithC Offline
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Champaign County, Ohio.
Originally Posted by gcs
Eh,.. it's green, and fills in the dead spots, it all gets leveled out when you mow,


The big problem with crabgrass is that it's an invasive annual. Crabgrass outcompetes and kills the more desirable perrenial grasses. As soon as the crabgrass has seeded or the weather turns cold enough, the crab grass dies leaving a bare patch until it comes back from seeds in late Spring to early Summer depending on where you live in temperate North America.

On my farm, I don't treat my lawn or worry much about its appearance. When I lived in town, I kept my lawn relatively weed free, weed whacked, edged and mowed much more frequently.

Keith

Re: Crab Grass [Re: Trapper7] #6604872
08/28/19 12:53 PM
08/28/19 12:53 PM
Joined: Dec 2006
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ny
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gcs Offline
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The Crab grass is an annual, totally dies off after a hard frost, but the jillions of seeds are waiting there for the next summer, thats why you use the pre emergent, to keep them from sprouting.

Re: Crab Grass [Re: Trapper7] #6604900
08/28/19 01:58 PM
08/28/19 01:58 PM
Joined: Aug 2010
Posts: 10,787
Asheville, NC
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charles Offline
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Use pre emergent twice in spring. Probably April and early May for Minn.

Last edited by charles; 08/28/19 03:58 PM.
Re: Crab Grass [Re: Trapper7] #6604910
08/28/19 02:15 PM
08/28/19 02:15 PM
Joined: Dec 2006
Posts: 15,594
MN, Land of 10,000 Lakes
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Trapper7 Offline OP
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I live out in the country and cut about 2 acres of lawn. I could live with the crab grass, but the little woman can't. Pre-emergent it will be come spring. Any special brand that's better than most?


I don't care how nice the hand soap smells, you should never walk out of the restroom sniffing your fingers.
Re: Crab Grass [Re: Trapper7] #6604913
08/28/19 02:27 PM
08/28/19 02:27 PM
Joined: May 2008
Posts: 1,076
SE Nebraska
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trapperne Offline
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SE Nebraska
Find a lawn landscape supply business near you and avoid box store stuff. For 2 acres you will need around 8 50 pound bags, shoI’ll run around $20 a bag. If you have any large bare spots you might want to round
Up those areas quick then fill up and plant some grass before it gets to late in the fall. Two things you need besides preemergent is to get your grass thick and don’t let it dry up. Any bare spots and any cracks and crabgrass will find it and preemergent won’t always work


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Re: Crab Grass [Re: Trapper7] #6604916
08/28/19 02:38 PM
08/28/19 02:38 PM
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MN, Land of 10,000 Lakes
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Are you referring to a pre-emergent treatment or now while the crabgrass is flourishing?


I don't care how nice the hand soap smells, you should never walk out of the restroom sniffing your fingers.
Re: Crab Grass [Re: Trapper7] #6604926
08/28/19 02:54 PM
08/28/19 02:54 PM
Joined: May 2008
Posts: 1,076
SE Nebraska
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trapperne Offline
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If you have big bare spots you need to try and get them filled in now, also you will probably need multiple applications next year, we do our customers may first and June first and if they are bad again in July. Also a dealer will have a herbicide that will kill crab grass but not regular grass but they are most affective when crabgrass is young.


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Re: Crab Grass [Re: Trapper7] #6604927
08/28/19 02:55 PM
08/28/19 02:55 PM
Joined: Dec 2015
Posts: 677
northern indiana
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kenny k Offline
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northern indiana
The stuff I have is called QUACKGRASS!!!! No cold or round up will kill it . It will burn it down but comes right back ,I gave up with it. There use to be a market for the root but no more.

Re: Crab Grass [Re: Trapper7] #6604930
08/28/19 03:04 PM
08/28/19 03:04 PM
Joined: Feb 2017
Posts: 109
KANSAS
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redhillstrapper Offline
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KANSAS
Find a product containing Quinclorac or MSMA and spray your yard. Both will kill actively growing grassy weeds and if applied correctly is safe for use on most all turfgrasses.

Re: Crab Grass [Re: Trapper7] #6604938
08/28/19 03:34 PM
08/28/19 03:34 PM
Joined: Feb 2014
Posts: 13,059
Ky
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jbyrd63 Offline
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Ky
the key to control it is waiting to apply the preventer as long as you can. This time of year the preventer has leeched out and the stuff goes wild. You can apply again in july as long as you don't use the type that is ammonia based. I don't put mine on until april and it will last until august if we don't have a lot of rain........

Re: Crab Grass [Re: Trapper7] #6604963
08/28/19 04:37 PM
08/28/19 04:37 PM
Joined: Dec 2010
Posts: 34,761
Central, SD
Law Dog Offline
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Central, SD
Been using Cimarron it's the only thing that I have found that kills fireweed and it looks like it takes out the crabgrass also. Check it out spendy but it goes a long ways one capful treats 15 gallons of water.


Was born in a Big City Will die in the Country OK with that!

Jerry Herbst
Re: Crab Grass [Re: Trapper7] #6604968
08/28/19 04:45 PM
08/28/19 04:45 PM
Joined: Jun 2018
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Beatrice, NE
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loosegoose Offline
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How long does the pre-emergent last? If I put it on in the spring and then again in July, will it cause problems come fall when I overseed my lawn?

Re: Crab Grass [Re: Trapper7] #6605058
08/28/19 07:03 PM
08/28/19 07:03 PM
Joined: Jan 2018
Posts: 1,684
Henry Co, IL
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3togo Offline
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Henry Co, IL
Trapper7,
Buy extra. Crab grass species emerge at different times during the summer. You need to put down the pre-emergent late March, early April. Then in needs to be put down again early to mid June. This just about solved my crab grass problem. Most brands only control for 3 months after application. More expensive brands MAY last longer. I use Estate brand form Farm & Fleet.

Re: Crab Grass [Re: Trapper7] #6605139
08/28/19 08:48 PM
08/28/19 08:48 PM
Joined: Jul 2012
Posts: 3,580
N. Carolina
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Scout1 Offline
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N. Carolina
Q4 plus will get a couple types of crab grasses, but is very effective for broad leaves. Tenacity is pretty good for crab grass. It may take two spraying though. Tenacity will turn it white . It is expensive.


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