Don't know your region, but 3 years ago our 20,000 sf lawn of mostly KBG, in southern New England, was infested with ground ivy - or Creeping Charlie. After some research I found that WBG was the best remedy. I followed the label directions and applied with an Ortho Dial'N Spray applicator. If I recall correctly, the mix ratio is 2 oz. per gallon per 500 sf. I bought the gallon concentrate and broadcasted the application in divided quadrants of 5,000 sf. The best time to apply is when the weeds are flowering, or as was my situation, just about now. I must say, it did the trick and killed about 85-90% of all the weeds, even clover. Problem with ground ivy though, is it comes back. I've noticed it's spreading again but have been reluctant to reapply the chemicals, due to our large organic vegetable gardens, located in the middle of the rear lawn. I'm sure other, more knowledgeable posters, will provide better feedback, but in my experience it did work - by following label directions.

Bermuda32: Thanks, that's good to know!Glad your lawn is green again. Sunfire: where did you find urea 35-0-5? auteck: are you saying that using weed be gone may cause your hybrid Bermuda to be overtaken by trash Bermuda? I am trying a new experiment in part of my lawn that is remote and was way more crabgrass than Bermuda: smothering! I am hypothesizing that the crabgrass will die from smothering but the Bermuda will come back...(this is in a spot that I may mulch over anyway for a path so if it all dies no big deal). I'm basing this theory on observations of the patch of land that had a 1000lb bag of sand sitting on it for a month. I'm just not sure how long to leave the piece of particle board down to kill the nasty crabs...

Crabgrass is an annual and it will die with the first hard frost anyway, so let that guide your decision. If you're not going to overseed in the heavily infested areas, I don't see the point in killing something that will die in six weeks on its own. You're right in asking if preemergent next spring is the solution to your problem. Yes, it is. That said, there are other uses for weed killer in the fall. September and October are the best times to control winter weeds (annual weeds that germinate in the fall and flower in the spring, e.g. henbit) and perennial broadleaf weeds like dandelions.

That's still kind of surprising, I would have thought any rotary on the shelf would go to at least 4" if not 4.5". I've also heard those husqvarna go down to 3/4", also unusual for a rotary. I'll have to check those out if my old Troy bilt ever decides to give up. I can't kill that thing