Additionally, it can be difficult to keep up with the sprays required, particularly under prolonged rainy weather. These ratings are intended as general guides only. Survival of microsclerotia of Calonectria pseudonaviculata (the boxwood blight pathogen) treated with a variety of sterilants. If Boxwood Blight shows up, follow Best Management Practices to quickly and decisively stop the infection. have been reported susceptible to boxwood blight in the landscape. Boxwood blight (also called “box blight” in Europe), caused by the fungal pathogen Cylindrocladium pseudonaviculatum (=C. 2) Isolate new plant material from other nursery stock for at least three weeks. A list of participating BBCP nurseries is available at, Only plants in the Buxaceae family (e.g. using this approach on infected English boxwood. Prepare 1:50 solution for use on unclean surfaces. Virginia and this approach poses risks. With their dense habit, bright green leaves and tolerance of heavy pruning, boxwoods (Buxus spp.) Introduction of infected boxwood plants and warm and humid summer weather conditions contributed to the epidemics. Prune and remove diseased branches on American boxwood. Join Virginia Tech Plant Pathologist, Mary Ann Hansen for a special series on boxwood blight. buxicola), was found for the first time in the United States in North Carolina, Virginia and Connecticut in 2011.Boxwood blight was first reported in the United Kingdom in the early to mid 1990’s and had spread through Europe and New Zealand by 1998. The disease is caused by two genetic types of fungi, Cylindrocladium buxicola and Volutella buxi, that attack the leaves and stems of the plant. If leaf debris has been incorporated into the soil, removing soil to a depth of 8" to 12" may help eliminate inoculum of the pathogen, but this is often impractical. 2). Once boxwood blight entered the picture, it was important to develop chemical control information as soon as possible. Kong P, Likins TM, Hong CX. STOP ripping out your blighted boxwood because you think they are dead. Virginia Cooperative Extension does not endorse these products and does not intend discrimination against other products which also may be suitable. Complete defoliation can occur within a week, and plants can die within a single growing season. Several commercially available sanitizers, such as ethanol and bleach, were evaluated for their efficacy against microsclerotia in laboratory studies. Fungicides containing chlorothalonil (alone or in combination with thiophanate-methyl or tebuconazole), fludioxonil, metconazole, and tebuconazole (as a stand-alone product) have been shown to provide good control of boxwood blight if applied prior to the … Our healthy other boxwood plants have never looked so good. doi: 10.1094/PDMR07; LaMondia, J.A. Cultural problems, such as poor drainage or deep planting, can also cause a general dieback of boxwood. Susceptible cultivars are similarly characterized by their degrees of susceptibility (e.g. The two fungi can be distinguished by the color and shape of the spore masses. For a list of sanitizer recommendations, refer to the Boxwood Blight Task Force website at, Mulch soil surface under existing boxwood and/or replacement boxwood to a depth of approximately 2”. Must be prepared fresh, 10-15 min. Susceptibility of Sarcococca taxa to boxwood blight by Calonectria pseudonaviculata. 2012. Boxwood blight was first reported in the United Kingdom in the early to mid 1990’s and had spread through Europe and New Zealand by 1998. Plant Disease 96:1069, Table 2. Remove diseased, susceptible boxwood promptly OR, if American boxwood, consider alternative approach for American* (below). Ghent University, Belgium; Ivors, et al. Sanitation and disinfection are two critical components of all disease control programs. Ethanol was very effective in Dr. Nina Shishkoff’s (U… All known species and varieties of boxwoods (Buxus spp.) Also note that weather conditions in Virginia are generally favorable for development of Boxwood Blight and repeated 2017. weather conditions. ], pachysandra [Pachysandra spp.] Treatment: If you suspect blight, first get a diagnosis from a trained professional. pruning out affected branches will not eliminate the Boxwood Blight fungus from American boxwood. Sarcococca blight: use of whole-genome sequencing for fungal plant disease diagnosis. LaMondia JA, Li DW, Marra RE, Douglas SM. neighborhood, town). Rep. 7:OT014. 2012. LaMondia JA. Scientists are working to develop effective control of boxwood blight for home growers with fewer fungicide applications. Once boxwood blight has been reported near your location, you may want to consider using preventative fungicide treatments for management. Fungicides. Professional landscapers have other product options, though they can be expensive. Diseased boxwood, leaf debris and soil should be double-bagged and removed to the sanitary landfill OR buried 2' deep in soil OR burned (if allowed in your locality). Boxwood Blight Facts Symptoms on leaves can appear… English boxwood (Buxus sempervirens 'Suffruticosa') is extremely susceptible to Boxwood Blight; therefore, no one is suggesting Epidemics of Boxwood Blight in 2018. There are no magical treatments for Boxwood Blight. Key Points. Therefore, treatment of whole plants of the very susceptible boxwood B. sempervirens ‘True Dwarf' with 450 ppm thiophanate-methyl, 120 ppm pyraclostrobin, or 150 ppm propiconazole 48 hours after inoculation demonstrated that only propiconazole significantly reduced the number of diseased leaves, number of boxwood blight lesions, and the frequency of re-isolation of the pathogen from …