Certainty has worked for me. It does take a few weeks before the Poa turns yellow. What rate did you apply?

I only spot spray mixed with Celsius. I use the 0.8g/G (1.25oz/A rate). You can go up to 1.28g/G (2oz/A rate). I mix with Celsius so I can hit any weed I see since these two herbicides pretty much will control everything.

 

I sprayed Certainty on some green kyllinga back in early spring and even after 3 to 4 weeks I was not seeing any effect. I went away on a work trip for 60 days and when I came back it was gone. Certainty works excruciatingly slow, especially when temps are low, but gets the job done in the long run.

 

Certainty isn't the greatest for POA. Other products are better like Negate, Revolver, Monument, etc. Do a search on the Forum as there are many threads on this topic.

 

If you have St Augustine you can’t use these 👆👆👆except for Monument

 

I used it (Sertay) and it has been slow in some areas with the cooler weather. It has killed some 100% but I need to spot spray a few areas again.

 

I used Certianty @ .8g/1000sqft on some poa. It seemed to stunt/slow the growth, that’s about it. Didn’t turn it yellow/brown. I reapplied at same rate 24 days later, a few days shy of the 4 week mark. Still waiting on the results to the Poa but I haven’t noticed any damage to the surrounding Bermuda. (Knock on wood!)

In another section, I hit at the same rate almost 3 weeks ago. I’m not even sure if all reapply. The Poa is turning a yellowish/brown color. This section gets full sun all day, other section only gets 6-7hrs this time of year.

 

Image did the trick for me in these cooler temps the past month. Took a couple weeks but it smoked it.

 

I have had good results eliminating poa by adding simazine to my fall/winter pre-emergent. The label says it has some post-emergent effect as well but I haven't tried it like that.

 

My application rate was calculated correctly, but my sprayer nozzle was chipped and I went through my mix too fast. Therefore, half my yard essentially got double the application rate of Negate. Anyone know what I should expect in my Bermuda? Any recourse or possible remedies?

 

At this point, just leave it. Get it next year with a solid pre em plan in the fall.

 

Never spray post-emergent herbicides on Bermudagrass when it's actively growing. Wait a few weeks: high temperatures will cause Poa annua to die back. Your next window for pre-emergent is in the fall when the soil temperature drops to 70 degrees. Then apply pre-emergent herbicide such as Prodiamine.

 

Do you mean never spray post-emergent when coming out of dormancy? You can spray bermuda when it is growing. How else do you spot spray weeds during the season?