CALONECTRIA PSEUDONAVICULATA CAN CAUSE LEAF SPOT AND STEM BLIGHT OF PACHYSANDRA TERMINALIS AND PACHYSANDRA PROCUMBENTS^©

Cylindrocladium pseudonaviculatum Crous, J.Z. Groenewald & C.F. Hill (syn= Calonectria pseudonaviculata (Crous & al.) L. Lombard & al., Cylindrocladium buxicola Henricot) was recently reported infecting boxwood Buxus spp. L. in North Carolina and Connecticut. This was the first report of this disease in North America (Ivors et al., 2012). The pathogen caused significant losses in container nurseries and in the landscape in both states and a number of boxwood taxa were shown to be infected. Henricot et al. (2008) reported that all Buxus spp. tested and a Sarcococca Lindl. (sweet box) sp. tested were all susceptible to this pathogen. Plants in the Buxaceae that are either native or grown as ornamentals in North America include Buxus, Sarcococca, and Pachysandra Michx.