I hate that your bees were killed. I would hate it if an adjoining landowner's operation killed my bee yard. I am curious, however, how it is that you will seek recompense for your bees being killed due to exposure on another's property. What can you do to the potato farmer who sprayed his own fields? Was there overspray onto your land, or were your bees on his fields? http://forum.beemaster.com/index.php/board,2.0.html
this is her other post describing the event.
EDIT: Brenda, I don't know if they've offered to pay you for the bees and honey- or if you're preparing a bill for them? if all you want is direct compensation -ok but if they try to jack you around I really think you have a case where they may have been WILLFULLY NEGLIGENT. You can punish them for 'forgetting' to notify you as you asked in writing by making them pay a lot more than the actual value of the direct loss. I'm not a lawyer, but you may want to see one.