DiseaseHigh Severity

Mimosa Wilt

Fusarium oxysporum f.sp. perniciosum

A lethal vascular wilt disease of mimosa trees caused by a soilborne fungus that colonizes and clogs the tree's water-conducting tissue, resulting in relatively rapid tree death.

Peak Season: First symptoms appear in early to mid-summer. Disease progression continues through summer and fall.
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Fusarium perniciosum showing characteristic wilting and root damage

Identification & Symptoms

What to Look For

Brown streaking in wood beneath bark and/or roots (early symptom)
Yellowed, stunted, and wilted leaves on one or several branches
Premature defoliation in mid-summer
Progressive yellowing and wilting on more branches
Discolored ring of sapwood visible in cross-section
Bark cracking as disease progresses
White frothy liquid with fermented odor exuding from cracks
Stunted, yellowed new leaves if tree survives to next season
Continued sprouting from base after tree death

Potential Damage

Systematic colonization of vascular system
Clogged and defective water transport
Rapid tree decline and death within one month to 18 months
Complete tree mortality
Loss of ornamental and shade value
Soil contamination with persistent spores

Lifecycle

The fungus survives long-term as chlamydospores in soil. Root exudates stimulate chlamydospore germination near host roots. Mycelium penetrates roots and colonizes vascular tissue, producing microcondia that move upward with sap. When trees defoliate prematurely, the fungus produces pink to orange spore masses in bark lenticels. Macrocondia are produced for up to two years after tree death and spread by air, water, and insects.

Professional Treatment Approach

1

Remove and destroy infected trees promptly to prevent spread

2

Avoid planting mimosa in areas with known infestation

3

Prevent soil movement from infected areas

4

Disinfect tools and equipment used around infected trees

5

Apply Fungisol as soil drench in preventive programs

6

Improve soil drainage to reduce favorable conditions

Recommended Mauget Products

Fungisol

Professional-grade treatment specifically effective against mimosa wilt.

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Arborfos

Professional-grade treatment specifically effective against mimosa wilt.

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