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Crabgrass in Wisconsin

Posted by mrspackrat800 WI (My Page) on
Tue, May 10, 11 at 17:33

We've been struggling with our lawn since buying our house in 2007. The main problem we have this year is crabgrass, and lots of it. Here are some facts:

- Type of grass--a mixture. I'll call our grass the "mutt" variety, we have a landscaper neighbor he agreed it's an odd variety. Of what is there is thin-bladed, and thin in density, yet green. The old owner threw down what ever cheap seed he could get his hands on.
- Much of our front lawn which gets full sun all day is crabgrass and lots of it, (lighter green, thick bladed stuff that grows very quickly...so I think that's crab grass).
- A section of our front lawn has no grass. We supposedly had a bug infestation last year and it turned the grass yellow and it never came back. So now dirt.
- Our side lawn is shady and seems to be doing well but could be thicker, very little crab grass or problems.
- Soil tests done by us with a kit indicated a pH of 6.5-7, Nitrogen and Phosporus was "low" while Potassium was "high" for both the front and side yard.

My question, now that it's May and temperatures are in the 50's, how can I treat the crabgrass while feeding what little grass is growing? We were going to put a post emergent herbicide spray on it when we can get a couple of days without rain. I think we missed the time to put on a preemergent herbicide. I just don't know if we need or should fertilze with anything. And do we do any other recommended fertilzer in June or summer or do we just keep attacking the crabgrass?

In the Fall, we plan to overseed as recommended and hope by next spring we'll have the start of a healthier looking lawn.


Follow-Up Postings:

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RE: Crabgrass in Wisconsin

What is your zip code?


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RE: Crabgrass in Wisconsin

First thing, crabgrass generally germinates when soil temps are above 60 degrees for 3-7 consecutive days. I live in CT, and my soil is at 62-64 degrees. I imagine Wisconsin's weather has been much cooler than CT's, so to have so much crabgrass this early is questionable. I haven't seen much in my area by the way. If your soil temps aren't 60 now, then you can go ahead with a preemergent. The preemergent Dimension also has some postemergent effects on very young crabgrass. You might have other weeds that look like crabgrass, there are a few out there like barnyard grass, quackgrass, goose grass, and others. If it is crabgrass, you can try Weed B Gone Max on it. There are also other herbicides that you can try, most have quinclorac in them, which selectively kills crabgrass. Here is a good site from Michigan State about crabgrass: http://www.turf.msu.edu/crabgrass-control-in-home-lawns

You would also be better off renovating in the late summer instead of overseeding. Overseeding will thicken your lawn, but it won't get rid of the hodge podge of grass you have now. It might sound like a big job, but in reality it's not much more work than an overseed. Just something to think about.


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RE: Crabgrass in Wisconsin

I concur with Tiemco that you do not have crabgrass yet. I'm in Raleigh, NC, crabgrass just started germinating about 2 weeks ago. And right now, the little that has germinated is basically baby crabgrass (seedlings) which doesn't look like much unless you go down in your knees and look for them.

Thick bladed light green grass could be K-31 tall fescue.

I can assure you that you don't have crabgrass.

Post some pictures if you can.


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RE: Crabgrass in Wisconsin

Thanks for the information. To answer autek's question, we live in the Milwaukee area.

Temps have been cooler than normal so I'm sure the soil temperature has not reached 60 degress until yesterday. Now it will be in the 70's and will rain til next week. I'm still not hopeful that we can put a preemergent on given how warm the temps are getting and with all the rain we are expecting.

Also, some added information, in 2009, we had our lawn top dressed and I have no clue what type of seed the guy used. If this isn't crabgrass, maybe it's the seed he used??

Here are some pictures...one is of our existing nicer looking grass. Maybe someone can identify the variety. I then took a picture of the wide-blade thick grass that is growing in clumps all over our yard. It's lighter green in color.

Any additional help would be appreciated!

Here is a link that might be useful: Pictures of our lawn


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RE: Crabgrass in Wisconsin

No, that is not crabgrass. Maybe K-31?


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RE: Crabgrass in Wisconsin

Well then that's some ugly grass!

I have to wonder if the guy who top dressed our lawn used that becasue of the all day sun we get on our front lawn.

If anyone has suggestions on a better variety of grass seed to replace it with, let me know. Looks like I'll be killing sections of our lawn off at the end of summer!


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RE: Crabgrass in Wisconsin

Yeah, that isn't too desirable. Wisconsin is KBG country. If it were me, I would get a soil test now, focus on improving your soil this spring and summer, killing everything in July, and planting a blend of good KBG seeds in early August.


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