What is the best Bermuda grass seed for the San Antonio, Texas area?
For seed, you'll probably need to use common bermuda grass; hybrid varieties are most likely available only in sod form. For some more information on bermuda grass in the San Antonio area, this link may be of interest: https://bexar-tx.tamu.edu/earth-kind-horticulture/best-plants-for-bexar-county-south-texas/lawn-grasses-for-bexar-county-centralsouth-texas/
What herbicides are available to a homeowner for the control of Poa Annua in a Bermuda lawn?
Spot treating with Round-up or boiling will work. This article should provide some additional info for you: https://www.gardeningknowhow.com/plant-problems/weeds/poa-annua-control.htm
We have a small batch of what we think is Bermuda grass. Any suggestions on how to remove it permanently?
I would recommend pouring boiling water on the areas where the bermuda grass was growing. Boiling water will kill whatever it comes in contact with. You can use chemical weed killers, as most will normally dissipate in a few weeks.
I had yard treated but the white clover keeps coming back. It is July and hot. I don't know what product to put on at this time of year.
Clover is hard to get rid of; if you've already had your yard treated, you know that. Here's an article that talks about your problem: https://www.gardeningknowhow.com/plant-problems/weeds/getting-rid-white-clover.htm
What are the preferred methods for killing Dallisgrass in my Bermuda lawn?
This article should help you get a handle on the problem: https://www.gardeningknowhow.com/plant-problems/weeds/dallisgrass-weed.htm
Rock salt keeps all grass and weeds out of asparagus but what about Bermuda - just keep pulling?
Yes, you will just need to keep pulling it. There are some grass selective herbicides that can kill it in asparagus, but there are no organic solutions other than hand pulling.
I have a lot of poa in my grass and it is a hybrid Bermuda. What would you suggest?
This article will help you:
https://www.gardeningknowhow.com/plant-problems/weeds/poa-annua-control.htm