Weeping cherry trees make beautiful additions to any lawn or garden. With their weeping growth that resembles that of a willow tree, weeping cherry trees are commonly grown as small shade trees. Weeping cherry trees are highly susceptible to gumnosis, which is a disease that causes the tree to constantly produce gum from where an injury has occurred on the tree, or it can be brought on by disease.
Look for signs of gumnosis on the entire weeping cherry tree. You will notice areas that are producing gum, a thick jelly-like substance. Generally the gum will be coming from an injured place on the weeping cherry tree, or a canker. You may find cankers that are not producing gum; however, they will in the future. The cankers will look like a black spot or a bruised spot on the trees branch or trunk.
Scrape away any gum using a sharp knife. Use your knife and cut out the canker or damaged spot in the trees trunk or branch. Cut down into the branch or trunk, until you reach green or white healthy wood. Keep cutting until the entire canker or damaged spot it removed.
Wrap the tree's trunk and affected branches in burlap or linen cloth to protect the tree, and to keep the gumnosis from spreading. Secure the burlap or linen with yarn to keep it from blowing away in the wind. Leave the protective cloth on the tree until the gumnosis subsides or winter causes the tree to slip into dormancy.
Cut away branches or limbs that are severely stricken by gumnosis. These branches will be covered in black, bruised-looking spots, and be producing gum from numerous bruised locations. You can remove these branches and limbs using garden loppers. The tree will benefit if severely infected branches are removed; The tree will begin to grow new, healthy shoots form the areas where you pruned away the diseased growth, and the risk of gumnosis being spread to other portions of the tree will be decreased.