trying to diagnose and treat advanced cherry tree disease.
Tree trunks have rotting outer wood, some much worse. Would it be helpful to treat and wrap at this point? One of three trees appears healthy. All have healthy leaves and branches-- the problem is isolated to trunks. Please help if possible.
Certified GKH Gardening Expert
I'm sorry, but your photos did not come through. Without knowing the disease, it would be hard to give any advice regarding treatment. Usually wrapping the tree with anything other than for winter protection when they aren't hardy will cause disease, or exacerbate the illness. Don't wrap them with anything, for sure.
You can try your local extension service, and they can test your soil for you. This article will help: https://www.gardeningknowhow.com/extension-search
You can also opt to test your soil yourself, to ensure that it is not deficient, but if it is a disease, you will need more than a simple home soil test. This article will help you to test your soil: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
This article will offer more information on common cherry diseases: https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-diseases.htm