ForesTree - Detail Information

Pest and Disease Information

* Cal. IPM phryganidia_californica

Affected Trees:
Canyon Live Oak, Black Oak, Coast Live Oak, Scrub Oak, Engelmann Oak, Blue Oak, and Tanoak.

* Complete Image Citations:
- Image #1: Used with permission from University of California Statewide IPM Program, Carlton S. Koehler, photographer

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Phryganidia californica
California oakworm


Description of Pest/Symptoms

California oakworm is an important defoliating pest of ornamental coast live oak. Most years it is of little concern, but some years the damage is extensive. California oakworm seldom kills trees, but it does make them unsightly. Young larvae skeletonize leaves and older larvae eat all but the major leaf veins. Adults are gray-brown moths and are weak fliers. Mature larvae are 25 to 35 mm long and are olive green with black and yellow longitudinal stripes. defoliation, caterpillars are black with longitudal yellow stripes.

Information on this Pest

pdf A Field Guide to Insects and Diseases of California Oaks

pdf Diagnosis and Monitoring of Sudden Oak Death

 yellow arrow California Oakworm, IPM Online

pdfCalifornia Forest Insect and Disease Training Manual

General Information and Contacts

 yellow arrow CA Agricultural Commissioners

 yellow arrow CA Cooperative Extensions

 yellow arrow Cal Fire - California Forest Improvement Program (CFIP)

 yellow arrow Cal Fire - Contact an Urban Forestry Advisor

 yellow arrow Cal Fire - Forestry Assistance

 yellow arrow Cal Fire - Pest Management

 yellow arrow Cal Fire - Vegetation Management

 yellow arrow California Department of Food and Agriculture

 yellow arrow California National Forests - Offices

 yellow arrow California ReLEAF

 yellow arrow California Urban Forests Council - Regional Councils

 yellow arrow Fire Safe Council - Find a Local Council

 yellow arrow Forest Health and Protection

 yellow arrow Forest Pest Conditions Pacific Southwest Region

 yellow arrow Southern California Mountain Area Safety Taskforce

General Grant Resources

yellow arrow California Oak Mortality Task Force - grants

yellow arrow California ReLEAF Grants

yellow arrow Fire Safe Council Grants Clearing House

yellow arrow Fuels Reduction Program

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*No warranties or guarantees as to the accuracy of the data and information derived from this web site are expressed or implied. The California Polytechnic State University and the Cal Poly Foundation shall not be responsible for any loss of profit, indirect, incidental, special, or consequential damages arising out of the use of the data and information derived from this web site.