Fusarium Wilt
Fusarium oxysporum
6 host plants · Fungal
Last updated
This profile synthesizes data from multiple published sources. Expert field review is in progress.
Plants suddenly wilt and die despite adequate water as the fungus colonizes the vascular system and blocks water movement upward. No cure exists once soil becomes contaminated with this persistent soil-borne pathogen. Use resistant varieties when available, sterilize all soil-contact tools, use new planting sites, and practice strict sanitation throughout. Remove all infected plants and never compost diseased material.
Vascular wilts are difficult to treat because the pathogen lives inside the plant's water-conducting tissue. Remove and destroy severely affected plants; do not compost them. The pathogen can persist in soil for years, so avoid replanting susceptible species in the same location. Focus on maintaining plant vigor through proper watering and fertilization, which helps healthy plants resist infection longer.
Quick Reference
Management
Infection risk highest May-October when soil is warm. Symptom expression peaks during warm months and drought stress. Cool maritime winters slow disease progression in the Pacific Northwest; trees may survive years with chronic decline. Once established in soil, the pathogen is permanent. Replanting the same host species in infested soil leads to rapid re-infection. source: PNW Plant Disease Management Handbook
Warm soil temperatures (75-85°F optimal). Root contact with fungal propagules in infested soil. Root injuries from cultivation, nematode damage, or other pathogens increase infection likelihood. Nutrient imbalances and drought stress accelerate symptom expression. The fungus requires living root tissue for initial colonization. source: PNW Plant Disease Management Handbook
Cultural Controls
- Plant resistant varieties when available. Host-specific resistance is the most effective management strategy. source: PNW Plant Disease Management Handbook
- Avoid planting susceptible species in infested soil. Once Fusarium is established, the soil remains infested indefinitely. source: PNW Plant Disease Management Handbook
- Rotate with non-host crops for 4+ years, though this alone may not eliminate the pathogen due to chlamydospore longevity. source: General IPM
- Soil solarization (clear plastic mulch for 4-6 weeks in summer) can reduce inoculum levels in the upper soil layer. source: UC IPM
- Avoid root injury from cultivation equipment. Minimize nematode damage through nematode management. source: PNW Plant Disease Management Handbook
- Maintain balanced fertility; avoid excess nitrogen which promotes susceptible succulent growth. source: General IPM
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