Neighbor Sabotage?

[S. Perry]

Need some advice on how to deal with a neighbor to my SFH rental. It is currently on the market with a PM for its first tenant. A neighbor is telling potential tenants lies about the property. This info is being told to the PM who is telling me. I have asked the neighbor to not have any contact with people looking at the property but it isn't working.

The property was vacant for nearly 2 years before we bought it over 3 years ago. I think the neighbor enjoyed not having any neighbors! He is lying about things that are off putting to renters and we have had no apps in a month on a home that should have rented in a matter of days.

How can I get him to keep his mouth shut or to undo damage that he has already done? The things he is saying would keep most people from renting! At this point he is messing with our livelihood. I would rather not go to war with this guy but will do what I have to do.