In this instance I would make a big deal about it. It doesn't sound to me that once the chemicals are sprayed and all the underbrush dies it would be worth hunting at all.

Figure out what the going rate for every little bit of your hard work is worth and then file a law suit that includes all of your work, court costs and attorney fees. I am not one for filing suits for every little thing but a verbal contract is a legal binding contract. You followed through on your part and he obviously did not follow through on his end.

Sounds like you could easily file for a few thousand dollars at least and if what you say is a true account of events a deserved amount.

People like this old man have never had any one stand up to them and put them in their place. Sounds to me that he needs to be brought down a few notches.