Australian Pines were a big problem where I grew up (Sarasota County). They basically took over several beach areas, especially Midnight Pass. I guess you have to be my age or older to remember the Pass before the idiots came down from up north, got in the government, and voted to CLOSE the Pass to stop the erosion of expensive beachfront property and swimming pools. No one bothered to do much research, and, of course, the beach continued to erode, just as it has done for thousands of years. What they DID manage to do was kill off an entire ecosystem that depended on the pass for its food supply. Many creatures went in and out of the Pass to the Gulf of Mexico daily. I'll never forget the stench of dead fish and sealife after they closed the Pass and we docked our little boat and went for a walk.
Sherry