Skip to main content
Skip to navigation
Washington State University
Search
Contact
Share
Ornamental Plant Pathology
Research Programs
Sentinel Tree Planting Project
Sooty Bark Disease
Bulbs and Cut Flowers
Christmas Trees
Lavender
Sudden Oak Death
Overview
Education Program
Research
Informing Management
Steam Treatments
Resprout Biological Control
Host Identification
Conifer Susceptibility
PNW Broadleaf Hosts
Rhododendron Susceptibility
Informing Nursery Practices
Fungicide Evaluation
Disinfectant Efficacy
Nitrogen Fertility
Biology and Spread
Phenotypic Variation
Detection in Waterways
Population Genetics
Monitoring
Overview
Volunteer Stream Monitoring Program
Overview
2021 Project
Projects
Movement of invasive plant diseases
Population genetics of
P. ramorum
in WA
Symptom ID Guide
Phytophthora
News
Pacific Madrone Research
Overview
About Pacific Madrone
Arbutus
ARME
Research Projects
Growing Pacific Madrone
Diseases and Pests
Arbutus
News
National Elm Trial
Overview
Pruning Elm Trees
Education Programs
Phytophthora
and Sudden Oak Death
Phytophthora
Información en español
Information for Specific Audiences
Nursery Professionals
Public Gardens
Forest & Christmas Tree Managers
Native Plant Producers
Master Gardeners
Students & Learners
Symptom ID Guide
Overview
Rhododendron
Camellia
Viburnum
Forest Health Watch – Biosurveillance Training
Emerging Plant Health Issues
Overview
Western Redcedar Dieback
Sword Fern Die-off
Bigleaf Maple Dieback
Sooty Bark Disease
Citizen Science
Overview
Arbutus
ARME
Volunteer Stream Monitoring Program
Overview
2021 Project
Forest Health Watch
Our Community
Support Our Program
Contact Us
Jobs and Internships
Forest Health Watch
WSU Puyallup
Ornamental Plant Pathology
PPO Home
>
Christmas Trees
>
065Fig1
065Fig1
Christmas tree foliar symptoms
