· There is no cure for cytospora canker on fruit trees and shade trees, but you can control the spread of the disease by pruning out the infected area. In late winter or early spring, remove infected branches at least 4 inches (10 cm.) below the canker where the tree is weeping amber color sap. · Gummosis, or bark bleeding, typically occurs in stone fruit trees in orchards, It can weaken a tree, but it's not usually lethal. View all Gummosis is the oozing of sap from wounds or cankers on fruit trees. Gummosis can result from environmental stress, mechanical injury, or disease and insect infestation. · Trees exhibiting cytospora canker symptoms, like the reddish ooze on tree trunks in these photos, may continue to live and even thrive, providing fruit and shade for many years, as long as the underlying stressors are alleviated. · There is no cure for cytospora canker on fruit trees and shade trees, but you can control the spread of the disease by pruning out the infected area. In late winter or early spring, remove infected branches at least 4 inches (10 cm.) below the canker where the tree is weeping amber color sap. Bacterial blast is also known as bacterial canker causes gummosis (weeping sap). It can seriously damage and kill fruit trees such as plum, apricot, cherry, peach and nectarine. Most obvious in spring, the symptoms of bacterial blast include dieback, oozing amber gum (gummosis) that has a sweet smell, browning blossoms and dark spots on leaves. A huge amount of amber coloured, jelly-like goop was oozing out of the trunk and branches of his cherry tree as you can see in the image above. That sticky goop is called gummosis and it's a sign that a tree is under stress. Gummosis is the oozing of sap from wounds or cankers on fruit trees. Gummosis can result from environmental stress, mechanical injury, or disease and insect infestation. · Trees exhibiting cytospora canker symptoms, like the reddish ooze on tree trunks in these photos, may continue to live and even thrive, providing fruit and shade for many years, as long as the underlying stressors are alleviated. · Gummosis, or bark bleeding, typically occurs in stone fruit trees in orchards, It can weaken a tree, but it's not usually lethal. Bacterial blast is also known as bacterial canker causes gummosis (weeping sap). It can seriously damage and kill fruit trees such as plum, apricot, cherry, peach and nectarine. Most obvious in spring, the symptoms of bacterial blast include dieback, oozing amber gum (gummosis) that has a sweet smell, browning blossoms and dark spots on leaves. A huge amount of amber coloured, jelly-like goop was oozing out of the trunk and branches of his cherry tree as you can see in the image above. That sticky goop is called gummosis and it's a sign that a tree is under stress.