Reference Data · Western Washington
Searchable directories of plants, diseases, pests, beneficial organisms, and soils - with host associations, susceptibility data, and management references built from regional extension research.
2,627 profiles indexed · Type a name, genus, or keyword
Profile updates driven by guide research and source monitoring
Red Thread enriched with disease cycle details, infection conditions, symptom descriptions, and 7 more areas from NC State Extension, NC State Extension..., UC Davis IPM, and 7 other sources.
NC State Extension, NC State Extension..., UC Davis IPM, and 7 other sources
California Gallfly and Azalea bark scale profiles updated with damage descriptions, diagnostic features, lifecycle details, and 3 more areas from PNW Insect Management Handbook and WSU HortSense.
PNW Insect Management Handbook and WSU HortSense
Cherry Laurel enriched with cultivar data and invasive notes from King County Noxious Weed Program, OSU Landscape Plants, and Washington State Noxious Weed Control Board Monitor...
King County Noxious Weed Program, OSU Landscape Plants, and Washington State Noxious Weed Control Board Monitor...
Coryneum blight (Shothole) enriched with regional notes from Kent weather archive 2020-2025, PNW Plant Disease Management Handbook, field observation, and guide publication.
Kent weather archive 2020-2025, PNW Plant Disease Management Handbook, field observation, and guide publication
Fall webworm and Leafcutting bee profiles updated with damage descriptions, infection conditions, cultural management practices, and 8 more areas from OSU PNW 692, OSU PNW 692 Table 1, UC IPM Fall Webworm, and UC IPM Leafcutting Bees.
OSU PNW 692, OSU PNW 692 Table 1, UC IPM Fall Webworm, and UC IPM Leafcutting Bees
Boxwood Blight profile updated with new infection conditions, spread mechanism, and cultural management practices from OSU Extension EM 9586 'Boxwood blight uncovered:... and OSU Extension EM 9586 —...
OSU Extension EM 9586 'Boxwood blight uncovered:... and OSU Extension EM 9586 —...
Asian Pear enriched with flower description, etymology, bark, and 6 more areas from Field observation, Issaquah WA, 2026-03-21, Field observation, Pyrus pyrifolia 'Chojuro',..., Hartman's Asian pear pollination chart (Western..., and 23 other sources.
Field observation, Issaquah WA, 2026-03-21, Field observation, Pyrus pyrifolia 'Chojuro',..., Hartman's Asian pear pollination chart (Western..., and 23 other sources
Read the guide →Cottony cushion scale and White Pine Blister Rust profiles updated with host range, infection conditions, vulnerability timing, and 6 more areas from UC IPM Pest Note 7410: Cottony Cushion Scale and UC IPM Pest Note 7602: White Pine Blister Rust.
UC IPM Pest Note 7410: Cottony Cushion Scale and UC IPM Pest Note 7602: White Pine Blister Rust
Rose Mosaic, Scab, Alder Rust, and 5 more profiles updated with causal agent identification, host range, symptom descriptions, and 14 more areas from OSU Extension - How to manage apple scab during..., OSU Extension - SLF forecast model impact page, OSU Extension - Vaughn Walton, OSU Extension..., and 4 other sources.
OSU Extension - How to manage apple scab during..., OSU Extension - SLF forecast model impact page, OSU Extension - Vaughn Walton, OSU Extension..., and 4 other sources
6 disease profiles enriched with regional notes and chemical control options from Alabama Extension, Morton Arboretum, NC State Extension, and 6 other sources.
Alabama Extension, Morton Arboretum, NC State Extension, and 6 other sources
Read the guide →Slug enriched with identification details, host range, lifecycle stages, and 5 more areas from Cornell Biocontrol, Cornell IPM, Edwards et al. 2009, and 14 other sources.
Cornell Biocontrol, Cornell IPM, Edwards et al. 2009, and 14 other sources
Garlic Mustard enriched with regional notes.
Species profiles with diseases, pests, cultivar resistance data, and site requirements.
Pathogens, host associations, causal agents, and regional management notes.
Non-pathogenic conditions — environmental stress, nutrient issues, chemical injury, and physiological disorders.
Invasive and noxious weed species with WA state classification, identification, ecology, and control methods.
Insects, mites, and other organisms with biology, host data, and IPM strategies.
Natural enemies with target pests, habitat needs, and conservation biocontrol strategies.
Soil series with drainage, pH, texture, plant suitability, and USDA-NRCS data.
Technical horticulture terms defined for the field, with links to guides where they appear.
Species with the highest number of documented disease and pest associations in the library. More connections means more to watch for - and more management decisions per season.
Pathogens affecting the most species in the library.
Organisms documented across the most host plants.
Profiles with the most cultivar-specific resistance and performance data - useful for making informed variety selections.
Active Project
This library grows through continuous data collection and verification. Profiles start with identity and host associations, then deepen with site data, phenological timing, cultivar performance, and regional management notes. Each dimension is sourced from extension research and field observation.
Every profile carries a maturity tier reflecting how much verification it's received. You'll see this as a four-segment meter on each profile page.
Baseline
Bulk-imported from authoritative databases. Accurate identity, no human review yet.
Structured
Synthesized from multiple sources. Conflicts surfaced, data organized coherently.
Expert-Reviewed
Reviewed by a credentialed arborist. Regional context verified for local use.
Field-Verified
Expert-reviewed plus validated with original field observations from this region.
Profile data drawn from 40+ registered sources including university extension databases, federal plant inventories, and original field observations. Full methodology →