I've managed hybrid Bermudas and hybrid Blue Grass. I highly recommend Poa Constrictor. Of course, like any weed it's prudent to prevent rather than teat to "kill." But annual Blue Grass has a way of hiding in the soil for years without germinating, coming up in the Spring without treatment in the Fall. For those of you "forgot" to teat in the Fall, kill with this chemical as soon as you see it's ugly sprouts. Not hard to miss in the Spring...it looks "great." Dark green, seed-heads and ready to kill out when you Blue Grass looks great. Been there too many times. PREVENT...and you don't need to use Poa Constrictor. I'm in Kentucky now with Spring Soil Temperatures at 55 degrees. I'm using Poa Constrictor...see what I mean? Greg