How to Manage Pests

Pests in Gardens and Landscapes

Phytophthora gummosis—Phytophthora spp.

An early symptom of Phytophthora gummosis is sap oozing from small cracks in the infected bark, giving the tree a bleeding appearance. The gumming may be washed off during heavy rain. The bark stays firm, dries, and eventually cracks and sloughs off. Lesions spread around the circumference of the trunk, slowly girdling the tree. Decline may occur rapidly within a year, especially under conditions favorable for disease development, or may occur over several years.

Solutions

Keep trunk dry; do not allow sprinkler water to hit it. Scrape away all diseased bark and a buffer strip of healthy light brown to greenish bark around margins. Allow to dry. Repeat if infection recurs.

For more information, see the Phytophthora Root and Crown Rot Pest Note.

Sap oozing
Sap oozing on tree infected with gummosis


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