When using Bonide Weed Beater ULTRA RTS, per the product label, hard-to-kill weeds may require a repeat application 3 weeks from the intial application. Please let us know if we can be of any further assistance.
Bonide Weed Beater ULTRA RTS can be used on dormant bermuda grass. Bonide Weed Beater does not have St Augustine or Floratam listed as a safe turf for this product to be used on. Floratam is the most sensitive grass that you can have so products are going to be very specific on the label and state if floratam is okay to be sprayed on.