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New Hampshire Department of Agriculture, Markets, and Food.
Boxwood blight (Calonectria pseudonaviculata, BB) kills plants in the family Buxaceae, including boxwoods, pachysandra, and Sarcococca. It was first detected in the U.S. in 2011, and many states have implemented requirements for boxwoods to have been grown in a certified “clean boxwood” program to ship into their state. When this disease is found in New Hampshire nurseries, infected plants are required to be destroyed. BB has been rarely found in managed boxwood plantations in the state. Care is recommended when introducing new boxwood plants into existing plantations as the disease can be latent and difficult to detect. The Horticultural Research Institute has best management practices guidelines for production and landscape managers.