The smell of rotting eggs(hydrogen sulphide) is repulsive to deer , in fact a lot of deer repellents have eggs as one of their base scents . Mix a dozen egg whites into a gallon of water with a couple of tablespoons of dishwashing liquid and a pint of cooking oil . Put the mixture into a sprayer , shake well to emulsify , then apply all around the stand site . Shake occasionally to maintain the emulsion as you spray . The scent is not strong enough for a human to smell above the normal woodland odors . He could sit in that stand until Doomsday and not see a deer .

Definitely compile evidence of this dirtbag trespassing and then arrest him personally , hammer his ass , he deserves it . The best evidence will be tons of trail cam pics of him sitting in your stand uselessly waiting for deer while you're having his truck towed for parking illegally on your property .