Erysiphe pulchra (formerly Microsphaera puchra) and Phyllactinia guttata can produce powdery mildew infections on dogwood. The images presented here show very early symptoms.
Useful information on the biology, diagnosis, and management of powdery mildew can be found at the Pacific Northwest Disease Management Handbook
More advanced symptoms and additional management information can be found at the University of Kentucky Nursery Update link.
Information on powdery mildew resistance research on various dogwood cultivars from the folks at University of Tennessee.
Orginal publication: 5/18/2006
Latest publication: 5/13/2016
Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University
Page last modified 5/13/16