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Evaluating Boxwood Susceptibility to Calonectria pseudonaviculata Using Cuttings from the National Boxwood Collection

N. Shishkoff, M. Daughtrey, S. Aker, and R. T. Olsen

January 2015


Accessions in the National Boxwood Collection of the U.S. National Arboretum were inoculated with Calonectria pseudonaviculata in order to determine susceptibility to boxwood blight as part of longer-term evaluations of whole plants. There were significant differences in percent diseased leaves and percent defoliation among the 42 species and cultivars. A diverse array of germplasm is available in the genus Buxus, and identifying acceptable levels of disease tolerance in cultivars that represent this diversity will contribute to its continued use in ornamental landscapes.


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