Rmart30, I dont know where you are but I have some prowl and im getting another jug of sonalan if you need a little. Both are pretty expensive. Ive never used the prowl for watermelons or canteloupes but im sure if marshmud says its ok it probably is. You can google the lables. Watermelons and canteloupes are not on the sonalan lable but ice been using it for several years.
Curbit and Sonalan have the same active ingredient, Sonalan is the row crop label. Ive never heard of Prowl being used as a pre-emerge in melons, maybe in the row middles only. Reflex and Sandea are a pretty good combo for watermelons too but a little weak on grass, Strategy is a combo of command and cubit and is ok but weak on broadleaves.