Cankers are caused by various species of fungi that infect wounded or stressed trees. The canker itself is the dead area on the bark that can be found on the trunk or branches. There are multiple types of canker disease, but common species of the disease include:
Trees of various species, such as oaks, pines, firs, willows and many more, are at risk for cankers. Any trees suffering from drought, injury, and other stressors are more susceptible to fungal diseases.
Symptoms vary depending on the type of pathogen and plant infected. The most obvious symptom of any tree is the appearance of lesions on the bark and dead leaf buds. These lesions sink into the bark, creating the cankers and eventually causing dieback. Trees can lose branches, sections of the crown or the entire tree could even be lost.
Once cankers appear, it is difficult to manage them. The best management practice is prevention. By keeping your trees stress-free and minimizing wounds to the trunk, you can help keep them free of fungal diseases. Some tips to keeping your trees stress free include: