Several fungi cause canker diseases on birch. These diseases infect and kill sapwood causing sunken areas on the trunk and larger branches. There is no chemical control for canker diseases. Preventive measures include keeping the tree healthy and avoiding wounding. Regular fertilization will keep birches vigorous and more resistant to cankers. Watering in dry weather to prevent water stress.
Dieback is characterized by a slow dieback of the branches. The tree crown accumulates dead branches. Injury caused by bronze birch borer is similar and far more prevalent. Prevent dieback by maintaining tree vigor with water and fertilizer. When the disease does occur prune out dead branches and increase tree vigor.
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|Nectria canker on birch - 45K|