The label says for use in:
"Bluegrass - Kentucky and annual, Fescue - tall, red and fine leaf, Ryegrass - annual and perennial, Bahiagrass (dormant), Bermudagrass (dormant), Zoysiagrass"

Are you certain you're battling Poa Annua? Am I missing something here?

 

Its the Sulfentrazone.

 

How far over the label rate are you applying? Are you doing heavy spot spraying? I’ve blanket sprayed at label rate for years and have never gotten any bleaching/damage to PRG or TTTF.

 

Although this thread is specifically about TZone, I've been able to eradicate and manage POA Annua in late Spring and Summer using low dosage Tenacity applications and pre-emergent prodiomine treatments. Your application rates may vary, but here are my journal notes from 2022:

• 6/12, 6/18, 6/25, 7/4 - Applied Tenacity at .25tsp / 1gal. / 1,000sqft without non-ionic surfactant. Watered in for Poa Annua treatment. Treating problem weeds like Poa Annua, Nimblewill, and Bentgrass takes frequent - low dose applications. Apply 7-10 days apart when the weed is actively growing. You need to apply 0.18oz (1.10 teaspoons) of Tenacity over 4,000 square feet. Don't apply more than 1.47oz over 4,000 square feet per calendar year.

 

My experience with Tenacity is that it will just slow it down but not eradicate poa. If you look more on youtube you will find people backing off of this Tenacity as a poa killer. I'm interested to know if more people have had success with the Tzone.

 

Bumping this. Anybody else have any results with Tzone killing POA?

 

In my experience, it dings it but doesnt completely kill it.

 

T-Zone doesn't kill it at label rates. Otherwise it would be pinned and the go to answer for everyone asking what to do.
Anyone that says it kills it, I assume they are using more than the label rate or more than the yearly limit (or possibly multiple products). Almost any chemical/herbicide used in a high concentration is likely to kill living organisms.

I can kill poa with regular water. Just drown it with too much water for too long so it gets no oxygen, nutrients are leeched away... etc.

 

I thought it was too good to believe as well, but he said he did it and it worked two years in a row. Also and then theres this guy on the youtubes

who claims he mixed tenacity with sulfentrazone and triclopyr (basically T-zone) and got it to die. you think these guys are just confusing poa dying in heat with dying because of herbicide?

 

I listened to the video... He speaks about poa annua...

There was no control for testing.

1) He is doing applications weekly (probably off/over label rate) - which could kill or weaken it by just poisoning the plant.
2) 3:26 - "... and then the heat comes into play. Poa does not like the heat and that was really the deciding factor in eliminating the poa..."
"... the heat comes in on the back end eliminates that."

Probably would have died with the heat alone. Doh!

Pre-Emergent (Autumn) or a full thick lawn is the solution for poa annua.
Anything that gets by, mow regularly and pull/spot spray with a grass killer. Repeat for at least 5 years.

 

I wish killing poa a and triv were as easy as you try to make it out to be. Killing it with water? You realize people might read this and think you know what your saying right?

 

Stumbled across this thread this morning. I just blanket sprayed TZone in a KBG Reno from last fall. No prodiamine. I know there is poa annua mixed in my lawn unfortunately. I have a feeling I am going to see some dead spots, I had a similar thing happen last year applying TZone to control woods violet. I thought I had just sprayed when it was too warm. In Mi, temps in the 60s-70s.

 

I be more concerned if it was July you should be just fine in April

 

FWIW I hit poa with WeedBGone for lawns and it turned and withered.

it appears to be bouncing back though im at 10 days since application.

 

Just bag your clippings during the spring for a few seasons and put down pre-em. POA A will die in the heat anyways so no need to pound the yard with chemicals.

 

Oh man, if only that were true everywhere. POA A is definitely a year-round offender in places such as the PNW. I can show you sead heads in every single month of the year. It’s definitely a perennial grass now.