Module 3: Phytophthora ramorum
Module 2: Disease Management
Welcome Module 1: Biology, symptoms, and Diagnosis Conclusion Take the Exam Further Information

What is Phytophthora?

Life Cycle

Disease Cycle

Species Profiles

Virtual Dying Plant

Diagnosis

Practice Questions 

Glossary

 

 

 

 

 

Seasonal Activity of Phytophthora Diseases

Several species of Phytophthora damage nursery crops in Oregon. The season when a given disease is most active depends on each pathogen's biology, the host, and the environment. The following chart shows six of the most common species found in both field and container nurseries. These are broadly categorized as warm-season or cool-season pathogens.

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