DiseaseHigh Severity

Sudden Oak Death

Phytophthora ramorum (oomycete plant pathogen)

A devastating disease caused by an oomycete plant pathogen that kills oak and other species of trees. Has had catastrophic effects on oak populations in California and Oregon, and is also present in Europe. Known for causing rapid tree mortality in previously healthy oak forests.

Peak Season: Most active during cool, moist periods, particularly fall through spring in affected regions
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Oak tree showing symptoms of sudden oak death with crown dieback and bleeding cankers

Identification & Symptoms

What to Look For

Sudden wilting and death of oak trees
Bleeding cankers on trunk and main branches
Dark reddish-brown sap oozing from bark
Crown dieback starting from top of tree
Yellowing and browning of foliage before death
Bark discoloration and cracking around cankers
Rapid progression from first symptoms to death
Secondary infestations by bark beetles

Potential Damage

Rapid death of mature oak trees
Devastating impact on oak forest ecosystems
Economic losses in forestry and urban settings
Increased fire hazard from dead trees
Loss of wildlife habitat and ecosystem services
Quarantine restrictions affecting plant movement

Lifecycle

The pathogen spreads through water splash, wind-blown rain, and human activities. It infects through natural openings and wounds in bark. The disease progresses rapidly through the tree's vascular system, disrupting water and nutrient transport. Cool, moist conditions favor disease development and spread.

Professional Treatment Approach

1

Early detection through regular monitoring

2

Preventive phosphite injections for high-value trees

3

Quarantine measures to prevent spread to new areas

4

Removal and proper disposal of infected trees

5

Professional assessment and treatment planning

6

Avoid movement of potentially contaminated plant material

Recommended Mauget Products

ArborFos

Professional-grade treatment specifically effective against sudden oak death.

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Phosphite-based systemic treatments

Professional-grade treatment specifically effective against sudden oak death.

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Need Professional Diagnosis?

Our certified arborists can help you accurately identify tree problems and develop an effective treatment plan using Mauget's proven injection systems.

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