Questions to ask in diagnosing problems
- Does a “real” problem exist with the plant?
- What is the “population” of the plants?
- How many of the plants are affected?
- What is the pattern of damage in the population? Do the cultural conditions of the affected plants differ from those of the unaffected plants?
- What part (or parts) of the plant is (are) affected?
- What is the pattern of damage within the plant?
- What is the pattern of damage on the plant part?
- When did the symptoms appear?
- Are the symptoms spreading, improving or constant?
- Are there any signs of a pest present?
- OSU Extension Publications: OSU gardening publications.
- OSU Extension Gardening: Archive of helpful articles!
- Pacific Northwest Insect Management Handbook
- Pacific Northwest defoliators
- Crane Fly pests of the Pacific Northwest
General pest or IPM
- University of California Integrated Pest Management
- WSU Pest leaflet series
- Pacific Northwest Nursery IPM
- USDA Forest Service Pacific Northwest Region Forest Health Protection
- Internet center for wildlife damage management
Plant Problem Diagnosis
- Washington State University Hortsense
- University of Minnesota Extension Diagnose a problem
- University of Maryland Landscape Problem Solver