How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Wetwood

Wetwood causes a portion of the trunk or branches to appear discolored and watersoaked. A sour or rancid, reddish or brown fluid commonly seeps from infected bark cracks or wounds. Wetwood-causing microorganisms are common in soil and water. They infect trees through wounds, including sites where pesticides have been injected into trees. Alcoholic flux also causes wood to exude fluid, but only for a short time during the summer, and the fluid has a fermented odor.

Bacterial wetwood infection
Bacterial wetwood infection

Alcoholic flux on almond
Alcoholic flux on almond


Statewide IPM Program, Agriculture and Natural Resources, University of California
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