Q.Plum tree bark
Our young plum tree, 3 years old is having a serious problem with the bark on one side of the tree. It seems to be rotting away?

Certified GKH Gardening Expert
Is there a gummy resin or sap oozing from this area? There are a few rots or canker problems that can affect plum trees. Bark can also be damaged by animals. These articles may help you pinpoint the problem
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-is-bleeding-sap.htm