NitaR In Calgary, the trees by the river are all protected with wire meshing - otherwise known as hardware cloth - around the bottom of the tree. It works.
365 Shades of Calvados You could send some of those eager beavers to my place - I need a special permit to cut trees on my land. ;-)
Marko Haka You cant put steel fencing on the base of the tree? We do it to protect our plants and bushes from the hare (rabbits and what not)