If it's not on your land, then leave it be. Pooring Diesel down the hole is a f****n stupid thing to do, we should be looking after the countryside, not f****n polluting it. You should learn to respect the places where you wish to hunt.
This type of behaviour gives countrysports a bad name.
if its killing birds on niebouring land then he cant leave it be can he ? and by the way its not a place he wishes to hunt