Telling him he can't harvest a buck on land you don't own seems out of place. Granted you're invested money and sweat but that was your own choice and you have no control over what the land owner allows.

Him inviting friends does seem a bit rude and disrespectful of your generosity inviting him along last year.

Where I'm coming from is I manage 100 acreas and used to invite 4-5 coworkers to bow hunt with me. Granted I invest thousands of dollars in permanent tree stands, food plots, mineral licks and many hours improving the land so I get the choice of stand each time we hunt but don't restrict what my friends harvest beyond my own restrictions (we practice QDM so any buck harvested must be larger than the previous personal best). Several of these friends never have harvested a buck so a spike is fair game where my own restriction is an 8 or larger with a 14" spread.

This year I'm inviting 10 boy scouts to hunt my land and they know the QDM rules. Granted none of them have ever harvested a buck before so I'm not bent out of shape if they shoot one of the yearlings. Just part of spreading the joy of hunting to friends and the younger generation.

Get over restricting your friend from harvesting a buck and lay down mutual rules you both can respect.

But tell him your displeasure in inviting friends who will invite friends and so on and so on. It will get out hand in a couple of years. This scenerio happend to my grandpa 10 years ago and ended up with a friend of a friends friend shooting my grandpa's buddy in a hunting accident. My grandpa was heart broken up to the time he passed and said his regretted loosing control on who hunted his property.

Good Luck.