On Monday, November 25, 2013 2:02:40 PM UTC-5, sf wrote:
> You need some sort of predator... like a dog, a cat or if you're
>
> lucky, a predatory bird. If you don't have any of those, you could
>
> wrap the tree trunk with a band of solid metal prevent them from
>
> climbing up it in the first place.

These wily little rats can jump onto the tree from the roof.