Phytophthora Foot Rot and Root Rot of Citrus
Phytophthora nicotianae
Citrusoomycete
A soilborne disease causing gummy trunk cankers, root decay, and canopy decline.
Symptoms
Gummy bark lesions at the base of the trunk (gummosis), decayed roots, and canopy thinning or dieback in advanced cases.
Favorable conditions
- •Wet soil around the trunk base
- •Bud union or graft line planted below or too close to soil/mulch
- •Susceptible rootstock
Management
- 1Plant on resistant rootstock
- 2Keep the bud union well above soil and mulch
- 3Avoid irrigation that wets the trunk
- 4Apply fosetyl-Al or metalaxyl as a soil or trunk treatment
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