DiseaseHigh Severity

Phytophthora cinnamomi

Phytophthora cinnamomi

A devastating soilborne water mold pathogen known as one of the world's most aggressive root rot pathogens. Causes crown rot, collar rot, root rot, and stem rot, often leading to rapid tree death. Particularly destructive in Mediterranean climates and areas with wet, poorly drained soils.

Peak Season: Most active during cool, wet periods in spring and fall. Trees most vulnerable during bloom and active growth periods. Can remain active year-round in mild, wet climates.
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Phytophthora cinnamomi infection showing characteristic root rot and crown damage typical of this water mold pathogen

Identification & Symptoms

What to Look For

Dark cankers at soil line extending into root system
Brown, slimy bark when wet conditions persist
Orange to reddish-brown discoloration of cambium and phloem
Rapid decline with chlorotic, wilting foliage
Crown dieback starting from branch tips
Foliage may turn purple before tree death
Sudden tree collapse in severely infected specimens

Potential Damage

Rapid root system destruction
Vascular tissue colonization and girdling
Complete tree mortality within one growing season
Chronic decline in partially infected trees
Soil contamination persisting for years
Major economic losses in susceptible tree crops

Lifecycle

Persists as thick-walled oospores in soil and infected tissue for many years. In wet conditions, oospores produce sporangia that release swimming zoospores. Zoospores are attracted to root tips and wounds, where they germinate and penetrate host tissue, rapidly colonizing vascular systems.

Professional Treatment Approach

1

Apply preventive systemic fungicides like Fungisol before infection

2

Improve soil drainage and avoid waterlogged conditions

3

Remove infected trees and soil around root zone

4

Avoid planting susceptible species in infested soils

5

Professional soil fumigation may be required in severe cases

6

Quarantine measures to prevent spread to uninfested areas

Recommended Mauget Products

Fungisol

Professional-grade treatment specifically effective against phytophthora cinnamomi.

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Mycoject Ultra

Professional-grade treatment specifically effective against phytophthora cinnamomi.

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