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Identifying and Managing Christmas Tree Diseases, Pests ...

Luisa SantamariaChal LandgrenA Paci c Northwest Extension PublicationOregon State University fi University of Idaho fi Washington State UniversityIdentifying and ManagingChristmas tree Diseases, Pests , and Other Problems PNW 659 April 2014 AUTHORS & ACKNOWLEDGMENTSL uisa Santamaria, assistant professor, Extension plant pathologist in nursery crops; and Chal Landgren, professor, Extension Christmas tree specialist; both of Oregon State 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 D

• Douglas-firAt bud break, spray fungi-cide (if needed) to prevent infection. • Remove and destroy severely infected trees prior to bud break. • Plant resistant or tolerant tree varieties; avoid Douglas-fir from Rocky Mountain seed sources, unless tested. only

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