I would love to hear from someone such as Green Doctor or someone who has experience with the old MSMA. At what rate per g would knock out this Dallisgrass? Green Doc, if you see this, this isn't for my lawn we talked about. However, I have a customer that has .75 of an acre. The complete back yard is covered in Dallas Grass that's growing at about 6-8" per week, 12-16" every two weeks. It's out of control and I can't even begin to catch up with this stuff. I did some homework and it seems like MSMA 6 should do the trick in two apps spread about 15 days apart. The lawn is a St. Augustine lawn or should I say Dallis Grass Lawn. The entire back is D. Grass. After I begin thinking about it, I think this lawn is probably how I spread the Dallis Grass to my lawn. I'm willing to bet putting my mower on that lawn then going to mine is what gave me the issue in my own lawn!