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In severe and rapid infections of Cytospora Canker, bark can split and girdle before cankers have a chance to form. Girdling is the complete removal of a strip of bark, which results in death of the plant above the girdle. The inner bark of an infected tree may turn reddish to dark brown or black and release watery resin or gummy ooze. Infection can also lead to yellowing needles, branch dieback, and stunted growth. The infection usually starts toward the base of the tree and expands upward.