You'll be very happy with the results using Grazon P+D and surfactant on tallow trees. I sprayed 15 acres last year with the Grazon mixed according to the TAMU brushbusters website and killed 80% of them the first spray.
Anazazi, The eating experience is the same, I didn't mean to infer different. I like to eat duck. The cross has much more growth and vigour for sure. We used Muscovy (drake) and Rouen Mallard (hens).