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How to Manage Pests

Identification: Weed Photo Gallery

Pacific poison-oak

Scientific name: Toxicodendron diversilobum (Family Anacardiaceae)

Life stages of Pacific poison-oak top left picture bottom left picture right picture

Click on image to enlarge

DESCRIPTION:
Pacific poison-oak is a perennial vine or shrub, sometimes treelike in form. It is known for its milky, poisonous oil that can cause a severe skin rash. Plants have three leaflets per leaf that turn bright red in autumn. It is particularly troublesome in the dry sandy soils of the foothills and dry-farmed mountain orchards. It reproduces from underground stems and from seed.

See UC IPM's Poison Oak Pest Note for more information.

Broadleaf ID illustration.


Statewide IPM Program, Agriculture and Natural Resources, University of California
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For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See How to manage pests, or in the U.S., contact your local Cooperative Extension office for assistance. /PMG/WEEDS/pacific_poisonoak.html revised: March 11, 2008. Contact webmaster.