Imagination: City trees 20. October 2020 Kevin-Buri Diseases of city trees, Step 1 Imagination, Team Zurich M18a (0) Imagination: I would like to introduce people to the most common tree species in the cities, using the city of Zurich as an example. I would like to educate about their most common diseases. I want to talk about the invasive plants that threaten the native trees. I want to explain how these problems could intertwine and impede the future of trees in cities.