Browse resources Displaying 1 - 1 of 1 resources Photo: Paul Reeser (Cropped from original) Phytophthora Online Course: Training for Nursery Growers n this course, you will learn about Phytophthora so that you can reduce the risk of Phytophthora disease in your nursery. Jay W. Pscheidt, Jennifer Parke, Niklaus J. Grunwald, Richard Regan, Jan Hedberg | Mar 2018 | Online resource