Foaming fermenting maple tree
Looked out the window today and noticed that the maple tree had some odd pinkish foam running down it. Standing on the downwind of it it smells of fermentation from several feet away. What is happening to my maple tree? And what do you suggest we do about it?
This is a condition called slime flux. Bacteria can gain access to the tree through a wound and use the tree sap as a food source. The foul smell is from the fermentation of the sap. Affected trees generally survive this well without any treatment. Typically the "slime" will clear up in drier weather.
You can read more about slime flux on the following pages: