Pear Scab
Venturia pirina
0 host plants · Fungal
Last updated
Data Coverage 2 of 6 dimensions
Quick Reference
Agent Type
fungal
Causal Agent
Venturia pirina
Host Plants
0
Spread
rain-splash, wind
Favorable Conditions
Primary infection requires rain or prolonged leaf wetness during the ascospor...
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Mar 19, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Seattle / UW | 969 | Scab season begins (early ascospore release) | Ascospore maturity (~100%) | 651 |
| Issaquah / East King | 959 | Scab season begins (early ascospore release) | Ascospore maturity (~100%) | 661 |
| Olympia / Tumwater | 906 | Scab season begins (early ascospore release) | Ascospore maturity (~100%) | 714 |
| Bellingham / Whatcom | 902 | Scab season begins (early ascospore release) | Ascospore maturity (~100%) | 718 |
| Kent / Auburn | 894 | Scab season begins (early ascospore release) | Ascospore maturity (~100%) | 726 |
| Sequim / Rain Shadow | 885 | Scab season begins (early ascospore release) | Ascospore maturity (~100%) | 735 |
| Tacoma / Puyallup | 877 | Scab season begins (early ascospore release) | Ascospore maturity (~100%) | 743 |
Note: Ascospore maturity predicted by GDD; actual infection events require rain or prolonged leaf wetness at susceptible temperatures.
Developed in Oregon. Strongest regional fit of any disease GDD model in the HFG system. No separate Western Washington validation, but climate is more comparable than continental models. Maritime Puget Sound may accumulate GDD more slowly in early spring than Hood River.