With the seasons slowing, there’s time to review the pests of this year, and make some mental notes for spring. Julia Turney, MG Class of 2004 and one of our Diagnostic Clinic coordinators, tells us about one annoying visitor to her garden.A plant problem that didn’t come into the Diagnostic Clinic this year but did show up on my Orcas pear is Pear Trellis Rust or Pacific Coast Pear Rust. It was first noticeable as orange spots on the upper leaf surface. Later in the summer the opposite lower leaf surface grew raised bumps called aecia. The sides of the aecia are finely divided, giving a trellis-like appearance. There were 20 or so leaves on the the tree with spots and the fruit didn’t seem to be affected.
The Pacific Northwest Disease Handbook identified junipers as the alternate host for the disease. This fungus first appeared in Bellingham in 1997 and has since been found in many areas of Western Washington. Coincidentally, my neighbors new landscaping includes junipers.