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Cottonwood tree is weeping

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From: Mary O'Hara
Thornton, IL
After a vigorous pruning, a friends cottonwood has developed a weeping sore in the trunk about 6 feet from the ground. The liquid appears to be sap and the hole does not appear to be made by insect or animal. Any ideas as to what it could possibly be? Thank you in advance.

Extension Message
From: Greg Stack
Extension Horticulturist
Extension Web Development
There are numerous cankers that can result in weeping areas on trees. Another cause could be wet wood which again is a weeping area that develops due to internal bacterial problems that builds up pressure inside the tree and soo results in liquid coming out of the tree. Cankers appear as cracks in the bark and wet wood appears more as a hole or openting. In either case not much can be done. I am suspecting wet wood and if so trees can live with the problem they just may not look the best.

From: Linda Green
Colorado Springs, CO
Our cottonwood provides the ONLY shade to the back of our house, and 2 years ago it developed a "weeping" sore - exactly as someone else has described. By the end of last summer 2/3rds of the tree had no leaves on it. Only a small green area could be seen at the top 1/3rd of the tree, so we were certain that it was dying. We hated the thought of parting with that tree, but arranged to have it removed in February. Important circumstances delayed the tree removal, and now the entire tree is covered with buds! DOES THIS MEAN THAT THE TREE ISN'T DYING AFTER ALL????? We would love to have your professional imput. Thank you, Linda Green

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