Douglas Fir Phomopsis Canker
Phomopsis lokoyae (fungus)
A fungal canker disease affecting Douglas fir trees throughout California and Oregon. Most commonly attacks saplings on poor sites but may also affect individual branches of mature ornamental trees under stress conditions.
Identification & Symptoms
What to Look For
Potential Damage
Lifecycle
Fungus enters through needle scars or wounds and establishes cankers at infection points. During wet season, spores are produced in pycnidia at canker edges and spread to other tree parts or adjacent trees. Disease is most successful in stressed trees.
Professional Treatment Approach
Remove infected branches promptly
Improve growing conditions to reduce stress
Proper irrigation and nutrition
Avoid wounds from pruning, climbing spurs
Fungicide injection for high-value trees
Prune only during dry conditions
Recommended Mauget Products
Fungisol
Professional-grade treatment specifically effective against douglas fir phomopsis canker.
View Product DetailsTebuject 16
Professional-grade treatment specifically effective against douglas fir phomopsis canker.
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Our certified arborists can help you accurately identify tree problems and develop an effective treatment plan using Mauget's proven injection systems.