Thousand Cankers Disease (TCD) is caused by the walnut twig beetle carrying the fungal pathogen Geosmithia morbida. TCD was first detected in Bucks County, Pennsylvania in 2012. The document discusses the identification of TCD on a property with black walnut trees, the subsequent quarantine of the county to prevent spread, surveys conducted that found additional infected trees, and requirements for regulated articles like firewood and mulch to prevent further dispersal of the walnut twig beetle and fungus. Cooperation between state and local agencies as well as the property owner allowed for a rapid response to the TCD detection and establishment of measures to manage its spread.