Mimosa Fusarium Wilt: Management and Replanting

Disease Confirmation

Your dying mimosa has Fusarium wilt (Fusarium oxysporum f. sp. perniciosum)—a lethal, soilborne vascular fungus. It clogs water-conducting tissue, causing rapid death. Only mimics (Albizia) and tree-of-heaven (Ailanthus) are susceptible.

Immediate Actions

• Remove dead tree completely—burn wood if possible to reduce inoculum.
• Do NOT replant mimosa or tree-of-heaven in same spot—fungus persists in soil for years.
• Other trees and garden plants are safe—host range is extremely narrow.

Protecting Remaining Mimosas

Fertilize with 10-10-10 at 1 lb/inch trunk diameter (scatter, water in) now and next spring. Vigorous trees resist infection better. No fungicide cure exists.

Long-Term Strategy

Replace dead mimosa with non-susceptible species: oak, maple, elm, etc. The fungus dies out without host plants.