Answer: I don't think there's a simple method of getting rid of the St. Augustine in your bermuda lawn. Hand digging is about the only solution. I have observed that the two turf types often co-exist for a long time rather than one overtaking the other. Here are some points to consider regarding what conditions may favor one species or the other: In the shade, St. Augustine has the edge. In drought conditions, Bermuda has the edge. Infrequent mowing schedules may favor St. Augustine a bit. Taller mowing heights may favor St. Augustine. Bermuda is more tolerant of heavy foot traffic. I don't know of any herbicide that will kill Bermuda but not harm St. Augustine. Wish I had more information to share with you.
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