What kind of weed?

soup006(7)March 19, 2011

What kind of weed is in this picture? I have centipede grass that is starting to green up but there are small areas that have this kind of thicker bladed weed. Is it crabgrass already? I didn't think that would be possible. I know there is another weed in the picture but I'm focused on the larger bladed weed.

Thanks

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bogey123

looks like chickweed to me. Weedbgone should do the trick

    Bookmark   March 19, 2011 at 2:18PM
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soup006(7)

I see the chickweed with the flower buds on it but I meant the grassy weed that has pretty wide blades. You can see toward the bottom it has a few white droplet stains on it which could be from the atrazine I put down.

    Bookmark   March 19, 2011 at 7:21PM
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soup006(7)

Anyone else? Does the large grass blades look like crabgrass? I'm not talking about the chickweed.

    Bookmark   March 21, 2011 at 1:46PM
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dchall_san_antonio(8 San Antonio)

I think you can rule out St Augustine. SA blades would be rounded at the tips. Does it grow from a central bunch or does it spread with runners?

    Bookmark   March 23, 2011 at 10:07PM
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soup006(7)

Here are a couple more pics. I think it might spread with runners. It does not seem to be confined to a clump in each spot I see it in the yard.

    Bookmark   March 25, 2011 at 3:54PM
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pacochu

Is it nutsedge? Do you get sprouts that have some sort of seed pod on top? That stuff is evil.

    Bookmark   March 25, 2011 at 7:48PM
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soup006(7)

No seed pods. At least not yet.

    Bookmark   March 25, 2011 at 9:13PM
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tiemco

It could be young crabgrass, but only if your soil temps have been 60 degrees for a few consecutive days.

    Bookmark   March 25, 2011 at 9:49PM
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nearandwest(7)

It is a warm-season lawn with a very mature green "weed" that is in question here. Think about what time of year this is. We know it is none of the following: crabgrass, henbit, chickweed, poa annua, nutsedge, kyllinga, goosegrass, or any warm-season weed. Hint: it may be considered a weed to some folks in the south, but up north it may be considered desirable. Also, notice the pointed leaf tips. So, what is it?

    Bookmark   March 25, 2011 at 9:52PM
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soup006(7)

I'm dying to know.

    Bookmark   March 25, 2011 at 10:26PM
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tiemco

So you think it's tall fescue nearandwest? I don't, looks too floppy and soft to be a k-31 or other wild type tall fescue.

    Bookmark   March 26, 2011 at 9:29AM
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soup006(7)

What should I use to kill the grassy weed in my centipede?

    Bookmark   March 27, 2011 at 8:25AM
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soup006(7)

Anyone? I'd rather not have to resort to using roundup on it since it will kill everything else around it.

    Bookmark   March 28, 2011 at 4:32PM
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nearandwest(7)

Ok, tiemco could be correct, and I could easily be wrong. You sprayed Atrazine on it about 10 days ago, correct? What product and rate did you use? The proper application of Atrazine will kill Tall Fescue. As of today, do you see any signs of the weed declining (turning yellow, brown, shriveling)? If it is TF, you should have started to see decline by now from the Atrazine.

    Bookmark   March 28, 2011 at 4:33PM
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soup006(7)

Thanks for replying. I used Image with Atrazine hose end sprayer which says it has 4% atrazine. It will be 2 weeks this Wed since I sprayed and I can see other weeds dying.

    Bookmark   March 28, 2011 at 5:21PM
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nearandwest(7)

And you are seeing no effect of this herbicide application on the vegetation in question?

    Bookmark   March 28, 2011 at 5:35PM
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nearandwest(7)

I must admit that the first thing I thought of when I saw the picture was that this was dallisgrass. But then I figured it was much too early in the season for dallisgrass. But then again, I don't know where you are located or didn't know when the picture was taken. I now know when the picture was taken.

Anyway, based on time of year, centipede, and green mature vegetation with certain visual characteristics, I felt like the only thing it could be is Tall Fescue. But if you applied Atrazine 2 weeks ago and the vegetation hasn't declined, then it isn't Tall Fescue. The atrazine would have taken out crabgrass also, so thats not it. Thats why I'm back to dallisgrass. Although very different, all three do have some similar characteristics.

But at this point, don't use Roundup. Your centipede will be very unhappy with that decision.

    Bookmark   March 28, 2011 at 6:01PM
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soup006(7)

It does not seem to be effecting it. Here is another picture I took from another area of the lawn which seems to show it in a younger stage. I think it is the same as the other pictures.

    Bookmark   March 28, 2011 at 6:06PM
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firstandgoal

If that's not crabgrass, i'm fooled.

    Bookmark   March 28, 2011 at 8:07PM
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nearandwest(7)

firstandgoal: well, I could agree with you, except the OP states that two weeks ago he treated the vegetation with Atrazine, which is a chemical that controls crabgrass(large and smooth). If it were crabgrass, I think he would have seen some decline by now. From the chemical application, he has already seen decline on other weeds.

    Bookmark   March 28, 2011 at 9:44PM
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soup006(7)

Unfortunately from doing some reading I have learned that dallisgrass is not easily killed in centipede. There were a lot of recommendations to spot treat with roundup.

    Bookmark   March 29, 2011 at 7:25AM
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nearandwest(7)

Ok, here is how to get a definitive answer to your weed ID question. Contact Fred Yelverton at NC State Univ. He is a professor of Crop Science and Extension Specialist Email: fred_yelverton@ncsu.edu or Bert McCarty at Clemson Univ. He too is an extension specialist and professor. Email: bmccrty@clemson.edu

Send in pictures with your question like you did here and one or both of them should respond within 48 hours.

    Bookmark   March 29, 2011 at 8:10AM
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nearandwest(7)

One more thing...if/when you contact Fred Yelverton or Bert McCarty, let them know you have already made a herbicide application; and include the name of the product, and the rate you used. These guys are very good at what they do and will be more than happy to assist you.

    Bookmark   March 29, 2011 at 10:38AM
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soup006(7)

Just thought I would update this and say that Mr. McCarty said it appears to be Dallisgrass. Unfortunately there is no selective herbicide to treat it in centipede and st. augustine. I can kill it with roundup and let the centipede fill in on its own.

    Bookmark   March 31, 2011 at 5:26PM
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nearandwest(7)

Well most importantly, I'm glad you got an answer to your question. Bert McCarty is one of the foremost authorities on turfgrass and weed issues. If he says it's dallisgrass, then it's dallisgrass! It can be a nasty weed if left unchecked, so definitely spray Roundup and get it out of there. You can always remove the killed areas after a few weeks and put in new centipede sod.

    Bookmark   March 31, 2011 at 8:12PM
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