Arborvitae Branch Canker
Seiridium unicorne
A serious fungal canker disease that affects members of the cypress family, particularly Oriental arborvitae. The disease causes elongated, flattened cankers that can girdle branches and stems, leading to dieback and potential tree death.
Identification & Symptoms
What to Look For
Potential Damage
Lifecycle
The fungus infects through wounds or natural openings in bark. It grows in the cambium and bark tissues, causing canker formation. The fungus produces spores that can spread to other branches or trees through wind, rain, or contaminated tools.
Professional Treatment Approach
Remove and destroy infected branches
Prune below visible cankers into healthy tissue
Improve tree vigor through proper care
Avoid wounding trees unnecessarily
Disinfect pruning tools between cuts
Apply protective fungicides to wounds
Recommended Mauget Products
Fungisol (Propiconazole)
Professional-grade treatment specifically effective against arborvitae branch canker.
View Product DetailsTebuject-16 (Tebuconazole)
Professional-grade treatment specifically effective against arborvitae branch canker.
View Product DetailsArborfos (Potassium phosphite)
Professional-grade treatment specifically effective against arborvitae branch canker.
View Product DetailsNeed Professional Diagnosis?
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