Forest Pest Advisories
August 7, 2014, Thousand Cankers Disease of Walnut has been confirmed in Bucks and Chester Counties in Pennsylvania. A quarantine restricting the movement of Walnut (Juglans spp.) and its products has now been issued for Bucks, Chester, Delaware, Montgomery and Philadelphia Counties. Thousand Cankers Disease (TCD) is a disease complex of Walnuts, that is caused by a native bark beetle (Pityophthorus juglandis) and a native fungal pathogen (Geosmithia morbida). Download a map of the quarantined area. and a USDA Pest Alert factsheet.