John from Baton Rouge, La writes
Since Hi-Yield Atrazine Weed Killer is not labeled as safe for use on bahia grass, it may suppress it. The most popular treatment for this would be to spot treat the bahia with a glyphosate product such as RoundUp QuikPro and then maintain the health of the St. Augustine so that it will fill in the bare spots.
Answer last updated on: 06/12/2016