DiseaseHigh Severity

Cypress Cedar Branch Canker

Seridium cardinale, S. unicornie, S. cupressi

A serious canker disease affecting Leyland cypress and related species, particularly damaging in landscape plantings and Christmas tree operations. Disease development is closely tied to hot, dry summer weather conditions, and can kill considerable portions of affected trees.

Peak Season: Symptom appearance: Any time of year, most common in springDisease development: Accelerated by hot, dry summer weatherSpore spread: During wet periods via splashing waterProgressive damage: Continues throughout growing seasonHigh-risk period: Hot, dry summer conditions
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Cypress cedar branch canker showing yellowing foliage and branch dieback

Identification & Symptoms

What to Look For

Yellowing or browning of foliage on individual branches
Branch discoloration appearing any time of year but most common in spring
Progressive disease development affecting larger tree portions
Girdling cankers forming on twigs, scaffold branches, and main trunk
Foliage death following canker development
Resinous exudation from infected areas

Potential Damage

Branch mortality from girdling cankers
Progressive tree decline as disease spreads
Potential tree death in severe cases
Economic losses in Christmas tree plantations
Reduced aesthetic value in landscape plantings
Structural weakness from canker damage

Lifecycle

Fungal spores are spread to healthy foliage and branches through splashing water and contaminated pruning tools. Hot, dry summer conditions favor disease development and spread. The pathogen establishes cankers that progressively girdle branches and stems.

Professional Treatment Approach

1

Fungisol applications during periods favorable for disease development

2

Remove and destroy infected branches to reduce inoculum

3

Sanitize pruning tools between cuts and trees

4

Improve air circulation around susceptible trees

5

Avoid overhead irrigation to reduce spore splash

Recommended Mauget Products

Fungisol

Professional-grade treatment specifically effective against cypress cedar branch canker.

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