[From the August 2016 issue of the UC IPM Green Bulletin]

Two “sap flux” diseases observed in landscape trees—bacterial wetwood (or slime flux) and alcoholic (“foamy”) flux—often trigger demands that a landscaper “do something.” Yet the most appropriate action may be to provide cultural care and to monitor for any additional problems rather than to apply chemicals or undergo drastic “tree surgery.”

Symptoms

A single wound or bark crack located on the trunk or a large branch...