Phytophthora Stem Canker
Phytophthora spp.
1 host plant
Last updated
Phytophthora stem canker appears as sunken lesions on stems that can girdle and kill limbs. Prune out infected branches well below visible symptoms and disinfect tools between cuts. Avoid wounding plants. Keep trees healthy to minimize infection opportunities. This disease favors cool, wet conditions. Canker management requires prompt removal of infected branches and careful attention to tree health and vigor.
Prune out cankered branches at least six inches below visible symptoms, making cuts into healthy wood. Sterilize your tools between cuts. Canker pathogens typically enter through wounds, so minimize pruning injuries and avoid working on trees when bark is wet. Maintain tree vigor through proper watering and avoid stress from drought or compacted soil, which makes trees more susceptible.
Quick Reference
Management
Cultural Controls
- Prune out and destroy infected branches. Plant disease-free nursery stock. Carefully inspect plants arriving from New Jersey or from the Southern States where this disease is a problem.