View Full Version : Triazine or Sulfonylurea family of herbicides?

05-15-2008, 06:48 PM
I'm still looking for a way to kill the Orchardgrass in my Tall Fescue.
NCSU Turf Files is a great source of information for lawn and turf in North Carolina.
However, there is little information there for controlling this weed.
Here is what I found...

Perennial grass weeds are not desirable as turfgrass species under any conditions. Therefore, every effort should be made to prevent these weedy grasses from becoming established in turf, as selective control measures are usually difficult. Selection of adapted turfgrass species and cultivars and the use of cultural practices are important in minimizing weedy grass encroachment and competition. Management practices include (1) mowing at the recommended height for the selected turfgrass and removing clippings when seedheads of grassy weeds are present; (2) applying the proper amount of nitrogen at the correct time according to the turfgrass present; and (3) using soil tests to determine needed nutrients and lime.

Warm season turfgrass herbicides in the triazine or sulfonylurea families will provide control of orchardgrass.

NO RESULTS: The above selection did not match any Treatment results in the database.

...Can anyone give me a "brand name" for the Triazine or Sulfonylurea family of herbicides?

05-15-2008, 09:19 PM
Velpar is one pretty common brand name for this class.

05-15-2008, 10:43 PM
Velpar looks like some nasty stuff. And, it looks like it stays around for a long time. But it does say it kills Orchardgrass although some damage will occur to Tall Fescue.
Thank you for that info.
Anyone else have anything to add?
What about MSMA?

05-15-2008, 10:53 PM
Anyone familiar with these herbicides?
Sulfonylureas are a family of environmentally compatible herbicides that were discovered by DuPont in 1975.
DuPont™ Escort®, Landmark®, Oust® and Telar® brand herbicides.

ted putnam
05-16-2008, 12:06 AM
Anyone familiar with these herbicides?

Atrazine and simazine are of the triazine family. Escort(Metsulfuron) is the same as Manor, Mansion,MSM, Blade. Sulfonylureas are Metsulfuron, Halosulfuron (Manage, Sedgehammer), Sulfosulfuron (Certainty) and others I'm sure. You'd just have to check labels. good luck

05-16-2008, 08:06 AM
Thank you Ted.

05-16-2008, 08:28 AM
I'm with you Rob. I started a thread last year. After the 2006 season a few of my lawns I seeded with Transition Blend (including mine) had Orchardgrass. I seeded about 100 others with the same stuff with no problems. No selective herbi is labeled to kill it. Va Tech tested a new product, Mesotrione which will be labeled to suppress Orchardgrass in cool season turf. Good luck and use only certified seed.

05-16-2008, 10:35 AM
"will be labeled?" Is it registered? Where can you get it?
Tons of problems with orchard here in c.va.
Heard that none of the sedge controlers work. manage, sedgehammer

05-16-2008, 01:02 PM
Tenacity by Syngenta was tested at VA Tech and they found that it suppressed (not controlled) Bermuda,Quack, and Orchard in cool season turf. When they wrote the article in March/ April the label was not available yet. I just got excited when I saw mention of Orchard Grass because it has given me such a headache. If you find something that works, please let us know.

05-16-2008, 06:38 PM
Can you post a link to that article from VA Tech? I'd like to read it.
Thank you for the help.
Orchardgrass must DIE! Tall Fescue must THRIVE!!!

05-16-2008, 06:49 PM
Not sure how bad your orchardgrass is but you could always go around with a chemical glove on and rub round up on a single leaf. I'm sure that would take care of it...

05-16-2008, 07:00 PM
Here's some info...


05-16-2008, 07:10 PM
Not sure how bad your orchardgrass is but you could always go around with a chemical glove on and rub round up on a single leaf. I'm sure that would take care of it...

There's just too much of it. I tried pulling it up but only got some of it out.
We had a severe drought here last year and it got established. There were areas of Tall Fescue that died completely. I have five trees that have died from the dry Summer last year that will have to be removed.
It may take years to get a good lawn again.
Thanks again to everyone who read and contributed to this thread.
I'll keep you posted as I find more info.

05-16-2008, 07:24 PM



05-16-2008, 07:35 PM
Orchardgrass can be a problem weed in turf type tall fescue and bluegrass lawns. The following is information on this grass and its control.
Mesotrione (Tenacity herbicide) is a selective control for orchargrass. It will turn it white. Several applications may be needed throughout the season for full control.

05-16-2008, 07:43 PM
What is noteworthy is that mesotrione can suppress or control certain weedy perennial grass species including nimblewill, orchardgrass, and creeping bentgrass in cool season turf.

(wi) Roots
05-17-2008, 01:54 AM
Spot spray r-up, wait 7 to 10 days re seed with desired turf. Mow approx. 3 time, then apply pre emergent thats not part of the sim/ family.

05-17-2008, 10:16 AM
(wi) Roots,
There's just too much to spot treat. I'd say 30% of my front and side lawn is Orchardgrass. And worse yet, my neighbor across the street has a lawn full of weeds. He does absolutely nothing but cut it. And when he does, all the seeds from the weeds come over into my lawn.

05-17-2008, 10:22 AM
I'm not real sure where Newton is, but in Garner/Raleigh area, you'd be better off throwing money in the road than trying to reseed right now (unless you can water it every day through the summer). Just gets to hot for it. I know what you mean about the drought though - when you're down to 45 days of water reserves in your local lakes, you know it's getting bad. Thank god for all of the rain this spring!

05-17-2008, 10:25 AM
Good Morning AnGreen,
Newton is 40 miles northwest of Charlotte. I think yall had more rain last Summer than we did.
I'll definitely wait until September to resow.