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re: Managing Winter Weeds in Lawns - LSU AgCenter

Posted on 1/12/22 at 10:59 pm to
Posted by cmac5125
Baton Rouge
Member since Mar 2011
291 posts
Posted on 1/12/22 at 10:59 pm to
Ronk, is this the stuff you’re talking about for perennial rye?

Trimec
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5262 posts
Posted on 1/12/22 at 11:59 pm to
quote:

Weed free zone in flower beds - Are you not worried about the 24D damaging the shrubs?

No - I take care when spot spraying to keep the herbicide from contacting shrubs; ditto with glyphosate (“Roundup”). Atrazine you want keep out of landscape beds.
Posted by ronk
Member since Jan 2015
6152 posts
Posted on 1/13/22 at 9:56 am to
That is it. the 2-4D may cause some yellowing. If you can find it a reasonable price Trimec Encore is better. They both have MCPP and Dicamba. Encore replaces the 2-4d with MCPA. Less yellowing and still great knockdown.
Posted by TheWiz
Third World, LA
Member since Aug 2007
11662 posts
Posted on 1/13/22 at 10:29 am to
Ronk, I can use this and it won't wax my annual rye grass?




Product Overview
Ferti-Lome Weed-Out Broadleaf Weed Control uses a Trimec complex of three effective weed killers (2,4-D; Mecoprop; and Dicamba) to kill emerged broadleaf weeds. Ferti-Lome Weed-Out Broadleaf Weed Control is effective on a broad range of lawn weeds such as chickweed, dandelion, plantains, knotweed, spurge, henbit, and many others (see label for complete list). Use Ferti-Lome Weed-Out Broadleaf Weed Control on established lawns (bentgrass, Kentucky bluegrass, centipedegrass, bahiagrass, bermudagrass, fescues, prennial ryegrass, and zoysiagrass).
Posted by Teufelhunden
Galvez, LA
Member since Feb 2005
5564 posts
Posted on 1/13/22 at 11:57 am to
I used specticle flo in September and have a little burweed and some dollar weed. Will spot treating with celcius work this time of year?
Posted by ronk
Member since Jan 2015
6152 posts
Posted on 1/13/22 at 1:07 pm to
Yes, but make sure you read the label and use it at the correct rate.
Posted by ronk
Member since Jan 2015
6152 posts
Posted on 1/13/22 at 1:08 pm to
Celsius works better in the hot months. Louisiana may be getting hot enough during the day but I'd use something else. MSM or the winter weed mix.
Posted by cmac5125
Baton Rouge
Member since Mar 2011
291 posts
Posted on 1/13/22 at 1:37 pm to
New to this. What would you consider a reasonable price for Trimec Encore. Thanks again.
Posted by ronk
Member since Jan 2015
6152 posts
Posted on 1/13/22 at 5:51 pm to
$125
Posted by yccsmf
Member since Apr 2013
529 posts
Posted on 1/13/22 at 10:48 pm to
What would you recommend for lespedeza that is taking over a centipede lawn? Thanks in advance for any info!
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5262 posts
Posted on 1/14/22 at 8:33 am to
quote:

What would you recommend for lespedeza that is taking over a centipede lawn? Thanks in advance for any info!

Do you need to treat lespedeza now?

I’ve had good success with MSM Turf (metsulfuron methyl) which you could spray now. During summer/warmer temperatures I usually use Celsius. Actually had pretty good control of lespedeza with Fertilome Weed Free Zone before I started using MSM Turf and Celsius in the lawn, which you could also spray now. .
Posted by tigerlife36
Member since Sep 2016
745 posts
Posted on 1/14/22 at 9:15 am to
I had the best luck in summer treating lespedeza with MSM over Celsius. It could have been I didn’t use the max rate or Celsius but MSM did a good job. I also tried a product called Changeup and it did the best.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5262 posts
Posted on 1/14/22 at 10:23 am to
quote:

also tried a product called Changeup and it did the best.

A herbicide I’m not familiar with but I see it’s another Trimec type herbicide that has fluoxypyr substituted for the 2,4 D.
Posted by tigerlife36
Member since Sep 2016
745 posts
Posted on 1/14/22 at 3:16 pm to
Yeah I got the idea from Lawncare life and Pauls Prime Cuts on Youtube. Both have weed control and fertilization businesses in the south and seem to favor it for lespedeza.
Posted by yccsmf
Member since Apr 2013
529 posts
Posted on 1/14/22 at 7:58 pm to
quote:

Do you need to treat lespedeza now?

I don’t have to do it now necessarily, but will do whichever you think is the best time to get results.
Posted by ronk
Member since Jan 2015
6152 posts
Posted on 1/14/22 at 8:31 pm to
You shouldn’t have to treat it now. If you have some still living then it’s been a very warm winter. It is best to treat it when it’s young.
Posted by zippyputt
Member since Jul 2005
5720 posts
Posted on 1/19/22 at 7:55 am to
Thanks! Winter weeds suck!
Posted by GrassFanatic
St.Amant, LA
Member since Jan 2022
5 posts
Posted on 1/20/22 at 4:56 pm to
Speedzone Southern is a good product to use this time of year for a post emergent. Simazine for pre emergent.
Posted by TGCM
Member since Dec 2020
81 posts
Posted on 2/6/22 at 8:56 am to
Relative to prior years, I have had remarkable results this year with a fall application of princept (simazine) and specticle flo (at 6 oz per 1k sq ft) on Burmuda. I had enough princept left over with some pin dee 3.3 to apply the low rates this month for a spring application. I see most people seem to use specticle in the fall and something else in the spring. However, is there a downside other than cost to come back in a month or two with a 6 oz per 1000 sq ft application of specticle flo? My main problem last year was sedge grass. Thanks for any thoughts.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5262 posts
Posted on 2/6/22 at 9:33 am to
quote:

Relative to prior years, I have had remarkable results this year with a fall application of princept (simazine) and specticle flo (at 6 oz per 1k sq ft) on Burmuda. I had enough princept left over with some pin dee 3.3 to apply the low rates this month for a spring application. I see most people seem to use specticle in the fall and something else in the spring. However, is there a downside other than cost to come back in a month or two with a 6 oz per 1000 sq ft application of specticle flo? My main problem last year was sedge grass. Thanks for any thoughts.

Are sure you didn’t apply the Specticle Flo at of 6 oz per acre (0.14 oz per 1000 sq ft) per label directions as opposed to 6 oz per 1000 sq ft? Although on Bermuda you can go as high as 10 oz per acre (0.23 oz/1000 sq ft) per application per label directions.

As far as I know, you can make 2 or 3 applications (late winter, late spring, fall) of Specticle Flo provided you don’t exceed a total of 18.5 oz per acre per year (see below in quotes, verbatim, off the Specticle Flo label). So you need to split your applications not to exceed the “max per application” for your grass type and the annual max.

“Apply SPECTICLE FLO in a single or split application program. The maximum single application rate of SPECTICLE FLO is 10 fl oz per acre. The total amount of SPECTICLE FLO applied in a 12-month period must not exceed 18.5 fl oz per acre.”

In my case I had planned to use Prodiamine in spring simply because I have it and I want to use it up. The Dimension I have I’ll start using in landscape beds. ronk likely has better knowledge on year around use of Specticle but as far as I know the limitation for some just may be the higher cost per 1000 sq ft of application compared to Prodiamine, Dimension, Simazine, etc.

With regard to sedges, there is no reliable pre-emergent herbicide that can deal with those. I personally use Sedgehammer (halosulfuron) as a post-emergent on nutsedge and kyllinga, and if I happen to be spraying other weeds with Celsius, I’ll hit the kyllinga with Celsius as it offers control, though not on nutsedge.
This post was edited on 2/6/22 at 11:01 am
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