carb grass

Every year I put down pre-emergent's and when the barrier gets broken from the lawn service I get crab grass. So I was thinking since there is no way to stop the seeds from germinating that the only way to get rid of it permanently is to let the seeds germinate, then kill it with roundup BEFORE the grass matures enough to produce and drop seeds.
Does this sound like a good way to get rid of it permanently? I figure the challenge I have is that when it grows I don't stop it from maturing and dropping seeds.
I know I'll have brown spots until I seed and water at the end of the summer.
Thanks!
Eddie G
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Eddie G said:

1. Aerify BEFORE you pre-emerge. 2. Get a new lawn service.

The pre-emergent, properly applied, at the correct time, over several growing seasons, will do such a thing.

lol
No.
The challenge you have is your lawn service apparently, sucks.

And how!

You don't water until the end of the summer?? Do you fertilize? Thick grass is the best deterrent for weeds, that I've ever seen.
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When I said lawn service I meant the cutters. I have a service that fertilizes, puts down pre-emergent's, etc. It's the cutters with the weed-whackers around the edges that breaks the pre-emergent barrier and allows the crab grass to grow.
I always have my lawn aerated in the fall.
Eddie G
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A pre-emergent will stop the seeds that are there from germinating. Other seeds may be coming into your lawn on the wheels of the mowing service. Seeds that have not been exposed to pre-emergent will germinate. I do not know what you mean that the cutters break the barrier of the pre-emergent.
Do not use Round Up as it will leave a major brown spot that will not fill in readily. Bayer chemical does make a weed killer that also works on growing crab grass without killing most lawns. It is the only selective crab grass killer that I have seen. I have used it mid to late season, and it will kill the crab grass. The problem is that it is a very slow kill. It does not give quick results. It will cut the local seed infestation, but crab grass seeds come from everywhere. A thick, healthy lawn will help to prevent crab grass by choking it out. I think that your lawn service is not doing a good job if the pre-emergent is not doing a better job for you.
Good Luck
DP
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What I was told about the pre-emergents is that it forms a barrier on top of the seeds to prevent germination, and if this barrier is broken,from any type of trauma to this "layer", like from the week whackers, than the crab grass will germinate.
BTW, I was using Chem Lawn for years and this year I am using Scott's lawn service, so we'll see what happens.
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way
BEFORE
the
Crabgrass is hard to control and takes a bit of effort every year. In the early Spring as others have noted, a pre-emergent treatment is required to prevent the plants from sprouting. But later on, say in July, you need to use a specific crabgrass control to kill plants before they can drop their seeds.
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wrote:

I tend to have some crabgrass that occurs depsite using a pre-emergent too. And it's most prevalent at the strip of curb by the street. It's an interesting theory that a weed whacker used to edge is the cause. I tend to doubt it though. In my case, I use an actual edger about every 6 weeks and still have a similar problem. I guess it's possible that the edger also throws up some dirt that affects the barrier.
The conclusion I came to is that the small amount of crabgrass that does germinate manages to do it mostly at the street curb because that is where the grass tends to be the weakest. That area gets the most sunlight and bakes right next to the hot pavement, so the grass never does as well as in the center of the lawn. It could also be that I should put down the pre-emergent earlier, as that area may be getting to germination temps well before the rest of the lawn.
I use Acclaim to spot treat the crabgrass. If you hit it early, it's very effective, far better than any of the crap ones I've bought at retail stores.
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