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Cool Season Weed ID Thread - What is it and how do I kill it?

406K views 2K replies 483 participants last post by  JBFUK 
#1 ·
These websites has a good list of weeds, sledges, grassy weeds with pictures that help ID them.
Weeds in Turf
Virginia Tech Weed ID Tool

Purdue website has these:(https://turf.purdue.edu/homeowner-resources/)

Control of Broadleaf Weeds in Homelawns (AY-9-W)
Control of Crabgrass in Homelawns (AY-10-W)
Identification and Control of Perennial Grassy Weeds (AY-11-W)
Yellow Nutsedge Control (AY-19-W)
ID and Control of Annual Bluegrass and Rough Bluegrass in Lawns (AY-41-W)

More weed list from Purdue- https://turf.purdue.edu/category/weed-of-the-month/

Some hard to ID ones:
Orchardgrass - http://purdueturftips.blogspot.com/2015/06/weed-of-month-for-may-2015-is.html
Quackgrass - http://purdueturftips.blogspot.com/2015/06/weed-of-month-for-june-2015-is.html

Check the Cool Season guide for Weed treatment options. In cool season, start with a 3-way (eg. Weed b Gon), then move to triclopyr (Weed b Gon CCO), lastly the rest most likely needs round up. A few hardones can be controlled with tenacity (bentgrass, nimble,).
 
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#1,156 ·
I live in southeast Wisconsin. I believe I have a Kentucky bluegrass and fescue blend. But my wife and I have lived here for 4 years now and we have always had the large straw color patch but now we have been noticing these small bundles popping up everywhere. The bundles seem to sit a little higher than the rest of the lawn. Is this a disease or different type of grass with delayed dormancy? Thank you for your help








 
#1,157 ·
Can you identify any of these weeds/grasses? I tried to group like-items together with multiple examples. Asking as I'm getting ready to throw down pre-m!

If I'm breaking any TLF norms, please let me know! :coffee:

Thank you, all - TLF and its members = my trusted source for all things lawn. :dancenana:

All photos linked below live in this photo bank: https://photos.app.goo.gl/jgg7DmEH2F7h5PWJA

• Weed #1 - new KBG battling weeds
o https://photos.app.goo.gl/XC6nFYNuSkE729fP6
o https://photos.app.goo.gl/J5jXsQs64uME2Nzp6
o https://photos.app.goo.gl/VAKxtqSmMk4dyRY88
o https://photos.app.goo.gl/qbG6HezFHJsdPcwq7

• Weed #2
o https://photos.app.goo.gl/2Q6VV5Hu9sqF4E726
o https://photos.app.goo.gl/bhZDUx2d6jzA3W926

• Weed #3
o https://photos.app.goo.gl/wZqYAa9CKdb1sFfC6
o https://photos.app.goo.gl/PkgyY5ADNFeU8Goy8
o https://photos.app.goo.gl/oiTuHQokQaKgD6Ds9

• Weed #4 - are the bunches crabgrass?
o https://photos.app.goo.gl/TBC9fQZkexvEA4FLA
o https://photos.app.goo.gl/jxkeMPcYMXRdFbrA9
o https://photos.app.goo.gl/JqtKB67rHjbrkcno9
o https://photos.app.goo.gl/WEQc8NeGbrqm3bu3A

• Weed #5
o https://photos.app.goo.gl/2sRWdiR7RqQoiFM26
o https://photos.app.goo.gl/grDwi5wfEYe1R3rLA
o https://photos.app.goo.gl/NoTmLjMmYYYvmv5v6
o https://photos.app.goo.gl/BtXTxT9iFipueXGT7
o https://photos.app.goo.gl/HzdTH7dvBznSU8LF6

• Weed #6 - clover and..?
o https://photos.app.goo.gl/UDUYW2c15K5Uh5y86

• Weed #7
o https://photos.app.goo.gl/VuvFX3SGSYd3xtma8
o https://photos.app.goo.gl/iKeW1DcYG9EfbHEP7
o https://photos.app.goo.gl/KCRpgkUGU4Eb39R27
o https://photos.app.goo.gl/9Vhvg9zUffzPHgX27
 
#1,161 ·
Forgive me, but I forgot to take pictures before I mowed yesterday. I have after mow pictures.

I have three dogs, one of which is large. As you can see from the "pee spots", they go often. Before I mowed yesterday, the lawn was basically all the same deep green color, albeit the "pee section" of the yard was much longer than the Other parts as the grass in general is just waking up here in Ohio.

Are the bright green spots where they have went to the bathroom and the grass simply hasn't browned and hasn't died yet like the other spots. This was the same area pre mow that was much longer, but still dark green at the top of the blades like the rest of the yard. I know what the "pee spots" look like in the grass. It is also very thick in these areas where it is a lighter green. Did is "scalp" the grass? Or is it Poa T?

I dug out a section in the yard where the brighter color is and attached pictures.

Just a little history on the yard...KBG sod laid in new construction home in July....Very hot and dry..Patio and irrigation installed shortly thereafter...Yard underwent a lot of stress to say the least.. Contractor "reseeded" after they were done and then I overseeded in the fall with KBG and PR.
I didn't see those brighter spots last fall if I remember correctly..

Ive attached some of the pictures from story I described above as well as current photos. Please let me know if you need any additional information.

Thanks for your opinions

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#1,166 ·
Is this heal-all (prunella vulgaris)? If so, How do I kill it? It is ravaging my lawn (region: northwest Oregon). I've treated the lawn with Ortho Weed B Gon and then about a week later Roundup for Lawns. Neither seem to have had an effect on the weeds. The Roundup was only about 36 hours ago, so perhaps it's too early to expect results. Thanks.





 
#1,168 ·
@HeadWest that weed is a first one for me.

MSU says triclopyr and it was the one I was going to suggest. The leaf looks shiny and waxy, so make sure you use a surfactant.

http://www.msuturfweeds.net/details/_/heal_all_22/#weeddetail

PSU list tenacity.
https://plantscience.psu.edu/research/centers/turf/extension/plant-id/broadleaf/healall
 
#1,169 ·
g-man said:
@HeadWest that weed is a first one for me.

MSU says triclopyr and it was the one I was going to suggest. The leaf looks shiny and waxy, so make sure you use a surfactant.

http://www.msuturfweeds.net/details/_/heal_all_22/#weeddetail

PSU list tenacity.
https://plantscience.psu.edu/research/centers/turf/extension/plant-id/broadleaf/healall
Thanks for the info, much appreciated. In looking at a few popular weed sprays, I don't see triclopyr listed as an ingredient. Any recommendations on what product I would find that in?

Update on the status of the weeds: 72 hours post Roundup for Lawns and they have started to slightly brown and wilt. It's not all of them, and it's not an overwhelming browning. TBD if it had any material effect.
 
#1,175 ·
Cincinnati guy said:
Hey guys! Little help here identifying these weeds. I did already use menards step 1 but obviously didn't work. I've used ortho weed b gon. Maybe I need a better product. Should I use my tenacity on it? I really need a new pump sprayer!
@Cincinnati guy that's poa trivialis. It's best to kill it during the spring growing season as much as you can before it spreads more. There are several threads here describing what people do to get rid of it. Va Tech plant lab told me to use glyphosate then sod/reseed after. Recommend spraying glyphosate 2 to 3 times to kill it. Don't be conservitave with the spray, triv spreads out away from the plant center.
 
#1,176 ·
Powhatan said:
Cincinnati guy said:
Hey guys! Little help here identifying these weeds. I did already use menards step 1 but obviously didn't work. I've used ortho weed b gon. Maybe I need a better product. Should I use my tenacity on it? I really need a new pump sprayer!
@Cincinnati guy that's poa trivialis. It's best to kill it during the spring growing season as much as you can before it spreads more. There are several threads here describing what people do to get rid of it. Va Tech plant lab told me to use glyphosate then sod/reseed after. Recommend spraying glyphosate 2 to 3 times to kill it. Don't be conservitave with the spray, triv spreads out away from the plant center.
Oh man this is going to suck! It's all over!!! Is there anything to prevent it? I'll look up information for it.
 
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