Boxwood Blight is a disease caused by the fungus Cylindrocladium buxicola. The disease has been prevalent in Europe for over 20 years, and made its way to the United States in 2011. First found in North Carolina, it has since spread along the east coast and continues to move across the states each year.
Boxwood Blight’s most characteristic symptoms include brown/black, circular leaf spots that lead to defoliation, as well as dark black streaks on the stems of the infected plant. It is a sticky pathogen that moves through splashing water, plant to plant contact, equipment, or in debris. The optimal conditions for this pathogen include damp areas with little air movement between around 70-75 F (21-23 C). Unfortunately this pathogen can survive for long periods of time in plant debris. There is no known cure at the moment, but there are lots of tips on prevention and management.
We are developing a site that can be used as a resource to help you understand the disease and how to prevent and manage it. For now, we recommend you look to the Saunders Brothers website for more information, linked below.