From June 11th to 14th, the second UB3Guard Training School "Nature Based Solutions in Urban Tree Biosecurity" took place at the facilities of Trädkontoret in Malmö, Sweden. Under the expert guidance of Johan Östberg and Cecil Konijnendijk, the 16 participants from 13 countries analysed the potential threats posed by current and future pests to the ecosystem services provided by urban forests and developed biosecurity strategies to protect Malmö’s green infrastructure.   (Video)