In Texas we trap them, blow them up, shoot them from helicopters, and shoot them from quads while chasing them at 50mph. They're too smart to shoot them from a standing position. I've seen packs of 15-20 running along together while riding my motorcycle along county roads in the middle of nowhere, San Saba County. But they normally stay out of sight; they're super smart. Good luck.
I wonder if you can shoot them from drones? That could be interesting.
You could certainly air drop explosives on them but that connotes serious risk to the environment and extremely inhumane injury or death to the pigs.
I wonder if some kind of dart could be used to euthanize them, though it would likely cost more than bullets and still lack accuracy.
What an awful topic though. The pigs have no idea they’re invasive. They’re such intelligent creatures, it’s an incredible shame that we’ve caused this.