White Mold Sclerotinia Rot
Sclerotinia sclerotiorum
3 host plants
Last updated
This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.
White mold sclerotinia rot appears on carob, mescalbean, and Texas privet as a soft, wet rot of stems and crowns, often accompanied by white, cottony fungal growth. Infected plants may collapse suddenly, especially in cool, moist conditions. The disease is most damaging to young plants and those stressed by poor drainage or high moisture levels around the root zone.
This soilborne pathogen persists for years in infected soil, so location matters enormously. Never replant susceptible species where the disease has occurred without addressing drainage first. Space plants for good air movement, water only at the base and early in the day, and avoid overfertilizing since tender new growth is most susceptible. Remove and destroy infected plants immediately to prevent spores from persisting in your garden.
Quick Reference
Management
Spring through early summer during cool, wet weather (March-June typical). Low-growing herbs and vegetables in contact with soil most at risk. Extended risk period in cool, moist growing seasons.
Cool, wet conditions (59-70°F optimum); extended leaf wetness or high humidity >85% required. Apothecia develop in spring during cool, moist soil conditions. Direct soil contact increases infection risk. Overfertilization producing lush, tender growth significantly increases susceptibility. Cool springs with frequent rain favor maximum disease development. # Source: PNW Plant Disease Management Handbook
Cultural Controls
- Do not plant crops in the same location each year.
- Do not plant susceptible crops where previous infections occurred.
- Space plantings to provide good air circulation.
- Avoid overhead watering.
- Water early in the day, to allow plants to dry before night.
- Provide proper culture.