Gain an understanding of Phytophthora and learn how to reduce the risk of Phytophthora disease in nurseries.

Designed For
A course for ​nursery growers, nursery managers and field staff
Online, instructor-led
Free without exam fee
With exam: $150
Oregon Department of Agriculture (ODA) Pesticide Divison: 4 hours
PLANET: 4 CEUs from category Educ3
Oregon Landscape Contractors Board:  4 CEH
International Society of Arborists: 4 CEUs
Society of American Foresters:  2.0 hours catagory 1-CF
Note: Credits are only available upon exam purchase and completion
Course Length
Approximately 4 hours

Certain species of Phytophthora - including sudden oak death, ramorum blight and rhododendron root rot - can devastate agricultural crops, nursery crops and forests, making Phytophthora disease the number one disease of nursery crops nationwide.

Phytophthora: Training for Nursery Growers, developed in partnership with the Oregon Department of Agriculture, provides information on Phytophthora and how to reduce the risk of Phytophthora disease in nurseries.

The course is divided into three modules, with review questions following each module: 

  • Biology, symptoms and diagnosis
  • Disease management
  • Phytophthora ramorum

Participants can stop and resume this 10-hour course at any time.

Certificate of Mastery 

Participants can take an optional online exam to receive a Certificate of Mastery on Phytophthora, which can be done through the Exam Registration Form. Those who pass the exam are eligible to earn CEUs from several different organizations. The list of these organizations can be viewed under the Course Overview section on the right side of this page.  Each participant must enter his or her pesticide applicator license number when registering for the exam.

  • How Phytophthora causes disease.
  • How to recognize Phytophthora.
  • How to manage disease.
  • How to reduce the risk of disease in your nursery.
  • Jennifer Parke

    Instructor Jennifer Parke

    Jennifer Parke is an associate professor-senior research in Oregon State University's department of crop and soil sciences. She earned her doctorate in botany and plant pathology from OSU and her bachelor’s degree in biology from University of California-Santa Cruz. Jennifer’s research focuses on the ecology of plant-associated soil microbes.