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.
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.
oozing on tree infected with gummosis