Calilfornia Oak Mortality Task Force

This site offers comprehensive information about Phytophthora ramorum including hosts, regulations and symptom images.

USDA Forest Service: Sudden Oak Death

This site is produced by the USDA Forest Service National Headquarters. It contains a symptom guide, several Powerpoint presentations on the topic as well as information on recent surveys.

Fact Sheet: National Pest Alert: Sudden Oak Death, NCIPM

This fact sheet produced by the North Central IPM Center provides basic information about hosts, pathogen biology, symptoms and management recommendations.

Fact Sheet: Sudden Oak Death, USDA Forest Service

This fact sheet provides basic information about Sudden Oak Death particularly focusing on the disease in the Western United States. However, basic symptoms and look alike diseases are presented.

P. ramorum Zoospores Emerging from a Sporangia, University of California Berkley
Video of P. ramorum zoospores emerging from a sporangia.