1. Smart bomb??
2. Sniper?
3. Contract hit?
4. You could leave a dead horse head strapped to the hood of their car.
5. Carpet bomb the whole place, clear the over and understory,.....and establish a better bedding and feeding habitat for the wildlife. It would only take it about 20 years for the explosives residue to get out of the soils....and by that time the poachers would have found somewhere else to hunt. You'd sure have it to yourself, though, for a lot of years.
6. Fence it in, install stadium lights and hunt at night while they're sleeping (poachers)?