Luisa Santamaria, assistant professor, Extension plant pathologist in nursery crops; and Chal Landgren, professor, Extension Christmas tree specialist; both of Oregon State University.
Acknowledgments
The authors thank the following peers for the review of these diagnostic cards and for their helpful comments and suggestions. In alphabetical order:
Michael Bondi–Oregon State University
Gary Chastagner–Washington State University
Rick Fletcher–Oregon State University
Alina Freire-Fierro–Drexel University
Carla Garzon–Oklahoma State University
Dionisia Morales–Oregon State University
Kathy Riley–Washington State University
Helmuth Rogg–Oregon Department of Agriculture
David Shaw–Oregon State University
Cathy E. Thomas–Pennsylvania Department of Agriculture
