I've tried Syngenta Primo Maxx at .15 oz/gal water with no effect. I've increased to .2 oz with no effect. I've reapplied at 125 GDD with no effect. Any thoughts? Another PGR I should try?
Thank you for info as I also have Citra Blue and plan to dabble a bit with T-Nex as well.My CitraBlue didn't show a response to T-Nex until after the second application. I sprayed at 0.15 oz./M. After the second application growth almost shut down entirely and the stolons started to grow tight with tiny leaves.
Looks like you're maintaining your SA pretty tall. Assuming that you're spraying properly, I think you just need to increase the rate of T-Nex in your mixture until you start seeing the suppression you want.Mowing
Generally, Primo MAXX provides more suppression when turfgrasses are maintained at lower mowing heights than
higher mowing heights. Application rates have been selected for typical mowing heights. The application rate may
need to be adjusted depending on actual mowing conditions.
And dang @franktiberi ....you are getting a WORKOUT using a reel on Citra BlueAtlanta, GA | 2600 sq. ft. CitraBlue St. Augustine | Fiskars 18" Manual Reel Mower
Years ago @Zoysiaguy shared that he was spraying T-Nex at 1.0 fl. oz./gal. on his Palmetto St. Augustine maintained at 2" and he was seeing regulation: https://www.thelawnforum.com/posts/118702/. That's a significantly higher rate than you two are spraying.For greater suppression with Quali-Pro® T-Nex®, maintain turfgrass at lower mowing heights. Note that the rates given in the APPLICATION RATE TABLE are for turf at typical mowing heights; therefore, the application rates should be adjusted based on the grass height at application. The lower the height of cut of the particular turfgrass species, the less material is required to provide the desired turf growth regulator effect.
I have mowed it as low as 1.5" and all the way to 4"! It did not look good much lower than ~2.5" in my yard. The 3-3.5" range seems to be the best overall height for my yard for whatever reason.@TampaBayFL you should consider dropping your HOC. Dr. Kenworthy recommends a lower HOC for CitraBlue and it looks so good at 2". My CitraBlue also only got 3.5 hours of sun per day, I imagine yours gets more. I don't think sun exposure would make a difference, but maybe?
Honestly, it's probably because many of us are semi obsessed and we just can't leave well enough alone😊Why try to PGR St. Augustine in the first place?
Yes, I applied at the 0.15 rate/1k on 7/8/25 and 7/25/25. I believe I am due for the next app now.That looks like regulated CitraBlue! Your last application was on July 25, right? Are you mowing less now?
Yeah....it just looks stressed and much much less blue/green. Even at ~2.5" now I can see those same visual cues. My mower also has a hard time cutting super cleanly at the lower HOCs as the Citra Blue has gotten quite thick with many blades crunched together vertically (they are standing up like pickets on a fence). I suspect my mower simply doesnt have the blade speed (and motor hp) to really give a good cut in this situation.What didn't look good about the CitraBlue when you mowed under 1.5"? Scalping?
To follow up with this----I suspect my mower simply doesnt have the blade speed (and motor hp) to really give a good cut in this situation.