'Bayer advanced' makes a product that controls bermuda in fescue, but i don't think it takes out crabgrass. They make another product that targets crabgrass and broadleaf weeds. You may have to buy both- but don't spray them the same day. I would think one week apart should be ok.

The one I'm trying to remember is basically a nuclear option. I'll take some collateral damage at this point.

Bayer's crabgrass didn't seem to do much to our varieties here; I don't think I tried their bermuda.

I'm looking for a flat out kill, not just control.

And yes, I understand I've gone past the addiction threshold.

I had a beautiful, near-indestructible lawn. Whatever it was, it would bounce bank from anything, including a couple of weeks of broken sprinklers in the desert summer.

Then I went away for four years that turned into 11, and the tenants didn't water it for at least three. I will have my lawn back. ( probably wouldn't feel this strong without the other $50k in damage to the house . . .)

I've used "Ornamec 170 Herbicide 32 oz" from amazon to kill Bermuda in my fescue and it gave pretty good results. Not sure if it works for crabgrass though. if you end up using this product please use exactly as it says else it will do more damage than you want to. (I'm not a lawn care professional so please use at your own risk)

I didn't put it together that you lived in the desert. Where do you live? please be sort of specific down to the town. Fescue is not appropriate for deserts, so I'm going to try to talk you out of it, but if you insist I can help you save the fescue. I realize someone has sold the Marathon dwarf fescues all over the desert southwest, but in retrospect, what a crime. The supposed daily watering requirements are ridiculous. About the only place Marathon works is within 3 miles of the Pacific coast. You can have a much nicer lawn with a fraction of the care hassle. You do sacrifice the deep blue-green color of the Marathon along with the slow growth, however.

Also please tell me what your watering schedule is - how often do you water and for how long?

How high/low are you mowing?

Las Vegas.

Yes, significant water. In late July/August, 3x4min/day; it dies quickly short of this.

Here the only grass I know of having wide use is tall fescue, which is also all the nurseries sell as turf.

As of Sep 1, we're still allowed daily, but not between 11-7 in the day; shortly it will be 3days/week, then 1.

I mow to about ankle length, close to 4", I think (except for later winter overseeing, when I scalp).

This week was the first with days that didn't hit 100 in quite a while . . .

I suppose Ormamec could be worth a try, especially in the back yard, where I have fruit trees and a hothouse. It does seem harder than the crabgrass . .