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Weed ID Help Updated with Dr. Ron Response

Posted on 5/13/21 at 5:13 pm
Posted by snake2985
Member since Jan 2011
334 posts
Posted on 5/13/21 at 5:13 pm
LINK

LINK

Can anyone tell me what this is and how to kill it


From Dr. Ron

Southern watergrass

There’s no control in St. Augustine grass or bermudagrass. High rates of Roundup is the only option.


This post was edited on 5/14/21 at 1:27 pm
Posted by ronk
Member since Jan 2015
6172 posts
Posted on 5/13/21 at 11:38 pm to
I’ve tried to think of everything possible based on the pictures and I can’t come up with anything. Pull one from the roots and post that picture. Not a pic of the root system itself but up close of the grass. A hairy or smooth and rolled ligule might help to id it.
Posted by WPBTiger
Parts Unknown
Member since Nov 2011
30877 posts
Posted on 5/14/21 at 8:03 am to


Posted by snake2985
Member since Jan 2011
334 posts
Posted on 5/14/21 at 10:11 am to
LINK LINK LINK

Here's a few up close
Posted by RaginCajunz
Member since Mar 2009
5310 posts
Posted on 5/14/21 at 10:18 am to
Is it growing in a more wet area of the yard?
Posted by CarRamrod
Spurbury, VT
Member since Dec 2006
57426 posts
Posted on 5/14/21 at 10:26 am to
the first pic looks like torpedo grass, but im not certain.
This post was edited on 5/14/21 at 10:26 am
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5264 posts
Posted on 5/14/21 at 10:31 am to
quote:

snake2985

If ronk doesn’t know, and I haven’t a clue either, I recommend you send the images to Dr Ron Strahan rstrahan@agcenter.lsu.edu, turf weed extension specialist and professor, LSU AgCenter. Be sure to tell him what type of lawn grass you have if you want control options.

Let us know he says, but even he might not able to tell for certainty from your photos without a seedhead. I think the last 2 images from your last post are too blurry to be of use.
Posted by snake2985
Member since Jan 2011
334 posts
Posted on 5/14/21 at 11:57 am to
It is mostly growing in the wet parts of the yard. It is unlikely torpedo grass as I am unfortunately well versed in that weed.
Posted by RaginCajunz
Member since Mar 2009
5310 posts
Posted on 5/14/21 at 11:59 am to
I have it as well. Whatever it is. In the "wettest" part of the yard. It reminds me of young rice seedlings. It's very soft under foot and I've never seen it seed. (not to say it hasn't)
Posted by zeto
BR
Member since Oct 2006
1217 posts
Posted on 5/14/21 at 12:12 pm to
I used to have that in my old yard as well. I never figured out what it was.
Posted by ronk
Member since Jan 2015
6172 posts
Posted on 5/14/21 at 4:10 pm to
Well I would prepare for 2-3 rounds of glyphosate. Then raise the area since watergrass needs lots of water. Drop some sod on top.
Posted by Daponch
Da Nortchore
Member since Mar 2013
996 posts
Posted on 5/14/21 at 9:20 pm to
Dr Ron identified it for me before and I couldn’t remember the name. I have some at my house too and it’s hard to eradicate for sure
Posted by CE Tiger
Metairie
Member since Jan 2008
41584 posts
Posted on 5/14/21 at 10:46 pm to
My app says it’s

quote:

Rice cutgrass is a hardy grass that thrives in full sun and wet soil. It can form dense thickets. The edges of the leaves can be very sharp and may cause cuts from walking through clumps of this grass, giving it the name, cutgrass.
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