Atrazine and bermuda

Atrazine is safe for St. Aug. Bermuda can handle herbicides that St. Aug cannot. 2-4-D is fine for Bermuda but kills St. Aug (and centipede).

However, atrazine turns frogs gay, so I don't like it for that reason. I don't like polluting the environment with hormone disrupting chemicals. Atrazine is banned in many countries.

EDIT: After reading your post again, I think you're asking if atrazine will kill bermuda and leave St. Aug alone. No atrazine does not kill it, but it will frick with it and slow it's growth (it will turn yellow). Bermuda is actually a pest and grows like a weed. It's hard to control it.

Fun fact: Bermuda grass is not actually native to Bermuda. It is native to India and has spread around the world via colonization. In many countries it is an invasive pest. America actually doesn't have many native grasses that work well for lawns. The one exception is St. Augustine which is native to the U.S. Unfortunately St. Aug will only grow well around the subtropical gulf coast. It struggles north.

Enjoy your new Bermuda lawn

Fusilade II and recognition will kill bermuda and Dallisgrass in St Aug. Bermuda is superior if in full sun though.

good deal?

Depends on how much area you need to spray.

Per 1k square feet:
0.85 grams of Recognition
0.55 oz of Fusillade II

That is a 4 oz bottle of Fusillade. Enough to cover a little less than 8k square feet with one application. Or 4K square feet with 2 applications. It’s recommended to spray the area twice one month apart for full control.

https://thelawncarenut.com/blogs/news/how-to-get-rid-of-bermuda-grass-in-st-augustine-lawns

That should do the trick, then.

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My area is quite small. The pool took up most of the back yard. Maybe 20x20.

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I should also throw this out, if you cut your St Augustine at a proper height, 3-4 inches, in time will crowd out-shade out and displace common Bermudagrass. It might take a few years - maybe sooner for a small area - but it works. My backyard lawn (5000 sq ft) was nearly 70% common bermuda after a pool build, etc. 20-30% St Augustine, some centipede. After 3 years of managing for St Augustine (largely changing my cutting height), you’d be hard pressed find any common Bermudagrass in the lawn. But it requires patience & persistence.

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2-4-D is fine for Bermuda but kills St. Aug (and centipede).

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I’ve used it as directed many times on St Aug and not killed the grass.