This lecture explores the growing threat that invasive pests and pathogens pose to urban trees and the broader urban forest environment. It highlights how global trade, climate change, and urbanization increase the risk of introducing and spreading harmful organisms. The session emphasizes the importance of biosecurity measures, early detection, monitoring, and coordinated management strategies to protect urban green spaces. By examining case studies and practical examples, the lecture underscores the need for integrated action among professionals, policymakers, and the public to safeguard urban tree health and resilience.
Keywords: Urban trees, Invasive species, Biosecurity, Tree health, Pest management