Local Forestry

Beech bark disease threatens beech trees

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.