Sparassis Root Rot
Sparassis crispa (syn. S
16 host plants
Last updated
This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.
Sparassis crispa, a wood-decay fungus, causes root rot primarily on spruce (Picea wilsonii). The disease affects stressed or weakened trees in poorly drained soils. Plant in well-drained raised beds, avoid overly deep planting, and ensure good root aeration. Prevent wounding near the tree base. Disease significance remains low in most ornamental landscapes, though it matters in native forest contexts.
Root rots thrive in waterlogged soil, so drainage is your most important intervention. Avoid overwatering and ensure the planting site drains well. Remove severely affected plants to prevent spread to neighbors through root contact or contaminated soil. When replanting, choose resistant species or improve soil structure before putting anything back in the ground.
Quick Reference
Management
Cultural Controls
- Plant only disease-free plants. Inspect and discard diseased nursery stock.
- Provide good drainage for plants in beds, fields, or containers.
- Place containers on gravel beds (4 inches or more deep) to allow drainage.
- Do not place containers on poly sheets; this prevents containers from draining into soil and allows contaminated drainage water to spread.
- Avoid planting in areas with poor drainage or near construction that may wound roots.
- Amend soils with composted sawdust or bark mulch to provide good aeration.