Sclerotinia White Mold
Sclerotinia sclerotiorum
0 host plants · Fungal
Last updated
This profile synthesizes data from multiple published sources. Expert field review is in progress.
Quick Reference
Management
Spring through early summer (April-June in the Puget Sound region). Flowering and early fruit set are peak vulnerability periods because the fungus preferentially colonizes senescing flower petals as an entry point. source: PNW Plant Disease Management Handbook
Cool to moderate temperatures (59-70°F optimal, range 50-75°F). Relative humidity above 85%. Requires sustained moisture at the soil surface for apothecial development. Dense canopy and poor air circulation increase infection risk. Most active during cool, wet spring weather. source: PNW Plant Disease Management Handbook
Cultural Controls
- Rotate with non-host crops (grains, grasses) for 3+ years to reduce sclerotia in soil. source: PNW Plant Disease Management Handbook
- Space plants to promote air circulation and rapid drying of foliage and soil surface. source: PNW Plant Disease Management Handbook
- Avoid overhead irrigation; use drip irrigation to keep foliage dry. Time irrigation so plants dry before evening. source: PNW Plant Disease Management Handbook
- Avoid excessive nitrogen fertilization, which promotes dense canopy and prolongs moisture. source: PNW Plant Disease Management Handbook
- Remove and destroy infected plants promptly; do not compost infected material (sclerotia survive composting). source: PNW Plant Disease Management Handbook
- Plant in well-drained soils. Improve drainage where possible. source: PNW Plant Disease Management Handbook
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