(photo taken from the City of Calgary website, see link below)
If you have a Mayday, Schubert’s Choke Cherry, or any other tree/shrub from the Prunus family, you’re likely familiar with the Black Knot Fungus issue in Calgary. It’s ugly, it spreads quickly, and it looks like cat poop on a stick (cannot be unseen)!
It’s easy to see now that the branches are bare so once you spot it, it’s time to act.