Currently there are attempts to demonstrate pro or contra the attribution of blame on possums for some cases of tree damage. Relatedly, there has also been discussion about the value of introduced predators in keeping the numbers of possums down. Currently Mt Eliza Council has hired Ecology Australia to study this matter. Their final results will be published at the completion of their study early in 2014. This article reviews the results of completed studies regarding tree dieoff and possum predators.