It can be very frustrating to watch your precious trees losing more and more leaves by the night to possum browse.
Some trees are good candidates for the installation of possum guarding, a clear polycarbonate band fixed around the stem. This prevents possums from climbing into the tree and encourages them to find food elsewhere. It is necessary to isolate the canopy of a tree to prevent alternate access.
A combination of exclusion pruning and possum guard installation may be appropriate.