I bought a place in South Texas last year and our Bermuda lawn had a terrible infestation of sandburs. I was told that the only way to get rid of it was to use a pre-emergent that contains Atrazine. I found several Weed & Feed products that contains Atrazine but it says it is for St. Augustine grass. What product recommendation does anyone have for getting rid of sandburs in a Bermuda lawn without hurting the Bermuda?