No, 3 Way Max Turf and Ornamental Broadleaf Herbicide specifically states to NOT apply on Floratam St. Augustine per the label. To kill Oxalis/woodsorrel in St. Augustine, you could use Blindside Herbicide. The product label does not exclude Floratam, but we would recommend testing a small area before doing a broadcast treatment, especially if the lawn is under any stress. (Some users have had Floratam discolor slightly when using Blindside, but the lawn generally recovers quickly.)
Q4 Plus can be used to treat Wild Strawberry in cool-season grasses. The mix rate would be 2.6 fl oz - 3 fl oz. per 1,000 sq. ft.
According to the 3 Way Max Turf and Ornamental Broadleaf Herbicide product label, when applying this product to Zoysia you will use 1.1 to 1.5 fl oz in 0.5 to 5 gallons of water per 1,000 sq foot area.
3 Way Max Turf and Ornamental Broadleaf Herbicide can be applied at the same time as a fertilizer.