Beech bark disease is a new threat affecting beech (Fagus grandifolia) trees in Canada’s hardwood and mixed forests. This disease is caused by a combination of an introduced beech scale insect (Cryptococcus fagisuga) from Europe, coupled with a nectria fungus. While the nectria fungus was likely native to North America, the introduced scale insect provides an opening to a new host tree for the fungus.

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