Boxwood blight, also known as box blight, is a fungal disease caused by Calonectria pseudonaviculata (Cylindrocladium pseudonaviculata, C. buxicola).

The disease was first detected in Connecticut and North Carolina in 2011. Since then, it has been identified in 10 other states including Delaware, Massachusetts, Maryland, New Jersey, New York, Ohio, Oregon, Pennsylvania, Rhode Island and Virginia. More recently, the disease also has been confirmed in landscapes in Alabama and Georgia.

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