Xylella fastidiosa, a bacterial pathogen notorious for causing damage to a variety of plant species, is making its presence felt across urban forests in Washington, D.C. The pathogen is responsible for a condition called bacterial leaf scorch (BLS), which leads to the decline and eventual death of infected trees. While X. fastidiosa has been well-documented in other regions, its spread in Washington is of particular concern, as it affects key species that are vital to the city’s landscape. In this post, we will dive into the research findings that document the presence and spread of Xylella fastidiosa in Washington, D.C., focusing on its impact on urban forestry. From newly discovered host species to the challenges of disease management, we’ll explore how this pathogen is reshaping the city's tree health. The pathogen is primarily transmitted by xylem-feeding insects, including leafhoppers, sharpshooters, and spittlebugs. Once infected, trees, especially those in urban envi...