Put up no trespassing signs and then press charges when they are on the property they will stop taking the cherries. get video of you asking them to stay off the property and stop taking your produce. Give the video to the officer taking the report. Be ready to go to court.
IANAL but as I understand it is if it's been permitted before they can make claims that it was allowed and therefore expectable. It's f'n stupid though. I have a 60ft tall pine tree that I can't easily remove from my yard because of it's proximity to the utilities that feed my neighborhood hub'd in my yard (they put them in before I got there). As far as I'm concerned being used for a hub for such things should at least get me a decent deal but I couldn't even renegotiate my cable last time around so I told them to come get the box. So help me if I ever find an attorney brave enough to fight them in court I'm going to call them to come get the tree or tie it to a chain and yank it down.