As if boxwoods didn’t have enough problems already with diseases caused by Phytophthora and Volutella, a new boxwood blight, caused by the soilborne fungus Cylindrocladium pseudonaviculatum (= Cylindrocladium buxicola), was confirmed on nursery plants in North Carolina last month. It was subsequently found in a nursery in Virginia and a residential landscape in Connecticut. The first symptoms of the disease are leaf spots that progress to twig blight and rapid death of the plant.
For more information, please see: http://www.ppws.vt.edu/~clinic/alerts/11-04-11_boxwood_blight_alert.pdf. If you suspect that this disease may be affecting your boxwoods, please send samples to the LSU AgCenter Plant Diagnostic Center for confirmation.