A healthy vigorous stand of turf grass will keep most of the poa anna out. First make sure that the weed is poa anna, and not a perennial cool season grass. Poa anna will not usually make it through the summer in your area. However, you must fix the underlying problems to keep the poa anna out of your yard. Does the bermuda get enough nitrogen fertilization at least a couple of pounds of nitrogen per 1000 square feet during the growing season. You said that the problem side of your yard has a lot of shade are tree roots also competing for water in this area? Also, bermuda grass needs at least 6 to 8 hours of direct sun a day. If that can not be achieved then maybe you need a more shade tolerant turf, such as zoysia, to be able to compete with the poa anna. If the area stays wet it might also be highly compacted so aerifiying during the summer would be a good idea. If some or all of these problems can't be corrected then you should just live with the poa anna because once you get rid of the poa anna another weed will take it's place if you don't have a healthy turf grass to fill in the area that the poa anna occupied. Eradicating the winter annuals from bermuda (poa anna, chickweed, and henbit) and keeping it out is not a difficult task.You can spray Roundup, buy the concentrate that contains just glyphosate and spray at the low rate, on your dormant bermuda grass at the end of January beginning of February.This is not as scary as it sounds just make sure you don't have any green tissue in the leaves, stems, and stolons. Maybe start small and just spray a couple of spots this year and see how it turns out. As for the henbit and chickweed, Bayer has a broadleaf product with 2,4-D, dimethylamine salt/ Mecoprop-p, dimethylamine salt/ Dicamba, dimethylamine salt. Spray this product mid/late spring when air temps are over 50 degrees. Pendimethalin is the best pre emergent option for the home owner, to keep out poa anna. Pendimethalin is sold as Halts by Scotts. Follow the labeled rate and apply around August 15th water in immediately with half an inch of water. Pendimethalin will also take care of your henbit and chickweed as well.

Tenacity (active ingredient) acts as both. The liquid can be applied/sprayed on weed as a foliar and sprayed on bare soil as a pre-emergent at the same time. Scotts has come out with a starter fertilizer with mesotrione granuals that acts as a pre-emergent only. You could put down the Scotts (soon) and overseed, then spot spray weeds with the Tenacity. Be Aware that Tenacity is relatively expensive, but it is the only thing that can be used with turf seed. Also be advised that now is the time to be putting down ANY pre-emergent for it to be effective.

I'm guessing you live in a gated community with a community association who can tell you how to part your hair. Scalping and planting rye is not a good idea so they are making progress. Ryegrass delays the regrowth of bermuda in the spring. Your landscaper's lawn mower cannot transmit St Augustine. It is fragile enough that it must be planted reasonably firmly to get a foothold. It almost had to be there prior to your current lawn for it to be there now. Crabgrass will die in a month or so when the heat goes away. It is an annual plant and will not live more than one growing season. However it could come back from seed next spring. Dollar weed could be anything from something easy to eradicate to something nearly impossible to eradicate. There are too many weeds that go by that common name of dollar weed to guess which one you have. Can you post a picture? Using a preemergent now is to prevent the spring wild flowers from coming up in your yard. The organic solution for preemergent is called corn gluten meal. Your people probably want you to use a synthetic preem. Just another comment: You should already be mowing bermuda at your mower's lowest setting. That makes it hard to scalp when your mower can't go any lower. I've seen the green tinted stuff. It is very artificial looking. I don't know what it is.

No kidding??? I just bought some Bayer Advanced weed killer last night. Will it accomplish the same thing? Or should I just hold onto it until the summer weeds try to invade and go ahead and spray with the roundup now? And one other thing... How about a green dye to mix with the spray? Has anybody tried that? I asked about it at Lowes last night and the woman there said they have never carried anything like that. Would'nt it make it much easier to see where you've sprayed???