Certified GKH Gardening Expert
First determine if the gummosis is caused by disease or not. Scrape away some of the gum to see the color of the inner bark. If it is dark, the gummosis is caused by a pathogen. If it is healthy, cream colored, there is nothing you need to do. If it is disease, these articles should help. Cultural controls may be your only recourse. I also would contact the local cooperative extension agent for advice. If the disease is severe, they will probably suggest removal of the tree to prevent spreading the spores.