Tree Sap Problem
We live in Aurora Co. We have a river birch tree that faces the west. We have noticed sap oozing down the trunk. It looks grayish/white. We have also noticed a hissing sound. Should we treat the tree with anything?
Certified GKH Gardening Expert
Sound like slime flux, or bacterial wetwood. This article should help: https://www.gardeningknowhow.com/ornamental/trees/tgen/wetwood-bleeding-trees.htm