Bayer Advanced All In One Weed & Crabgrass Killer Concentrate Quart (704140A)
Product Review (submitted on August 31, 2012):
I just checked my Massachusetts lawn of bluegrass and perennial rye this afternoon (August 30th, 2012; 11 days after application). The Bayer Advanced All In One Weed & Crabgrass Killer Concentrate worked fine on my mature crabgrass. Years ago I learned that quinclorac was the only herbicide effective on crabgrass after it tillers (branches into more than one leaf). Since 2003, I paid through the nose to buy quinclorac from Leasco/John Deere as Drive 75 DF, but it was worth it. Now it's gone off-patent and Bayer combines generic quinclorac with old reliable 2,4-D and dicamba at a price not much more than the 2,4-D used to cost.
I'm delighted with it.