Susceptibility of 23 commercial boxwood cultivars to boxwood blight Fungicides can also mask symptoms of the disease on susceptible cultivars. Some cultivars of boxwood can harbor the boxwood blight pathogen, yet show no symptoms these cultivars are considered partially resistant 2 (also referred to as “tolerant”) cultivars (Table 1 on page 2). 2 on page 2) and black streaking on box-wood stem tissue (Fig. The most characteristic symptoms of boxwood blight on susceptible boxwood cultivars are brown leaf spots (Fig. Home growers can best protect their boxwood by following the measures listed below to avoid introduction of the disease to their landscape. container or field-grown boxwood, boxwood greenery used for holiday decoration), but boxwood blight spores can also be spread on pruning tools, clothing, equipment and anything that might have contacted infected plants. The major means of spread of this disease is by movement of contaminated plant material (e.g. Once introduced to a landscape, boxwood blight is very difficult and costly to control with fungicides. By the fall of 2013 it was found in other commercial nursery/retail operations and landscapes in several counties in Virginia. In Virginia boxwood blight was first identified in a nursery location in Carroll County in 2011. What is Boxwood Blight?īoxwood blight (also known as box blight), caused by the fungus Calonectria pseudonaviculata 1, is a serious fungal disease of boxwood that results in defoliation and decline of susceptible boxwood. This Best Management Practice document is a set of guidelines for home growers of landscape boxwood to avoid introduction of the boxwood blight pathogen into a landscape or, if the disease is already present in a landscape, to manage the disease in the most effective manner and avoid spread of the disease to new locations.
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