Is the sticky sap that comes off the oak tree poison I have black berries ...
Is the sticky sap that comes off the oak tree poison I have black berries under the tree
Riverside County California
Thank you for your question. It would be helpful to have a photo of the fluid, and to know whether it is coming from a wound in the bark, or an infected sight. If it is from a wound, it is probably mostly sugar, ‘made’ by the tree leaves to ‘feed’ the plant. That would be messy, but not harmful. If it is from an infection, it could contain bacterial and/or fungal material which could be unhealthy. I suggest you take photos of where the seepage is happening, and some sampling of the fluid, and visit your county Extension office for help. Here is their webpage: http://ceriverside.ucanr.edu/ Good luck!