Many trees in our community can be infected by Black Knot Fungus – an air-borne fungus affecting trees in the prunus family. Schubert Chokecherry and Mayday trees in the City are particularly affected by the fungus, which looks like black clumps of coal that wrap around twigs, branches and even the trunks of trees in some extreme cases.

Privately-owned Tree: If you notice this developing on a tree you own, please deal it with it as soon as possible to stop the spread to other trees growing in our community. You can learn more about how to best deal with Black Knot Fungus on the City of Calgary website.

City-owned Tree: If you notice this developing on a tree owned by the City of Calgary – please contact 311 to request Calgary Parks to deal with the tree and stop the spread of the fungus.