Poast grass killer has strawberries on it's GRASS KILLER LABEL. I would make sure to use a clean PUMP SPRAYER when doing the application so you don't contaminate the plant with some other residual. But as you can see on the label, it can be used for many plants including strawberries.

The best product to isolate just the bermuda would be POAST GRASS KILLER. You can use it to kill most any grass that grows in flower beds, pine islands and basically anywhere other than the actual yard itself (unless you want to kill your good grass too…). You can see it on line in our WEED CONTROL ARTICLE along with all our other weed products.