I have a 3/4 acre lot in North Texas, been here about 2 years. It used to be horse pasture, and the primary grass is Coastal Bermuda, with a fair but not overpowering complement of various weeds. I do Scotts Bonus S in the Spring and it takes care of most of the broad leaf stuff and the Bermuda loves it. It grows a bit fast and thick, but otherwise makes a reasonably nice lawn. It remained green for a valiantly long time during the drought last year.
However, the front lawn was mottled with Dallisgrass. I work long hours with a long commute and like to mow as infrequently as possible, so it was unsightly and frustrating. Researching the species and the few options to combat it, I took the cheap, fast, sledgehammer approach -- I have killed the dallisgrass dead, dead, dead with extreme prejudice using Spectracide, and I enjoyed it. It took a few applications in some places but it's clearly not coming back any time soon after I hit it hard enough. Naturally that left plenty of ugly dead spots in the yard. The front lawn also seems to be Coastal with maybe some more common Bermuda in places, and a few other scattered weeds I can probably spot treat. It may be my infrequent mowing (1-2 weeks), but the Coastal doesn't seem too quick to fill in the dead areas. I'd say I still have 90% of my front lawn Bermuda left and actually growing quite thick, and mainly need to treat the dead spots.
My plan is in the next week or two mow it short, core aerate, cultivate the dead spots that can be reasonably watered, and overseed Bermuda with my spreader. I thought I'd try a Sahara Bermuda seed. I don't really know what I'm doing though, how well this variety will blend with the Coastal, if it will take over or eventually be strangled out, assuming I get it to sprout and grow at all. I'm also dealing now with a sparse bit of nutsedge coming up. It seems manageable so far -- every few days I scour the lawn and hand-pull a fat fistful of the stuff, hoping to control and rid myself of it that way.
Thoughts? I'm cheap and have limited time to work on this. The lawn is ugly right now, but the fact that I'm not mowing or looking at Dallisgrass anymore is already an improvement in my mind. Just don't want more weeds taking up residence in the dead areas and need to get some decent grass growing there.