Boxwood blight causes extensive defoliation, while look-alike disorders tend to have leaves turn tan to brown, but remain attached to the plant. One major difference between boxwood blight and its look-alikes is the potential for defoliation. Many of the symptoms associated with the disease are similar to other common boxwood disorders. Boxwood blight can be a challenging disease to identify outside a plant diagnostic laboratory. Boxwood Blight: A New Disease for Connecticut and the U.S.With the recent detections of boxwood blight, which is a regulated plant disease, in Illinois, the importance of scouting landscapes and new plants for the disease is greater than ever.Prevention and Management of Boxwood Blight - Kelly Ivors, North Carolina Cooperative Extension.Boxwood Blight - Pacific Northwest Plant Disease Management Handbook, Pacific Northwest Cooperative Extension.Connecticut Agricultural Experiment Station Boxwood Blight Page.BMPs for Production and Retail Nurseries.See the Connecticut Agricultural Experiment Station's Best Management Practices for Boxwood Blight for more information: For growers or retailers, a rotation of fungicides is thought to be helpful for prevention.Research into effective treatment is ongoing. There are no known fungicides that can eradicate this pathogen from infected plants.While the root system of infected plants remains intact, it is not recommended to keep infected plants as they may become sources of inoculum for healthy plants.It is most important to quarantine new material and to avoid placing uninfected plants in locations where the disease has been found, even if unhealthy plants have already been removed, since the fungus can remain active in leaf litter.More information about diseases of boxwood can be found in this page from Clemson Cooperative Extension:.Volutella fruiting bodies are salmon-colored, not white. Volutella Blight ( Volutella buxi) causes browing of foliage but infected plants do not have circular leaf lesions and lack black markings on stems.Secondary infection by Volutella blight ( Volutella buxi) or other pathogens may occur.Root system remains intact but it is not recommended to retain damaged plant material because the disease can spread to healthy plants. Boxwood blight is unsightly and can lead to near-complete defoliation.Under high humidity, white spore masses (sporodochia) may be visible on stem tissue and the undersides of leaves.Shoots with multiple dark brown or black lesions (cankers) that are diamond-shaped or linear.Foliage becomes blighted, turning light brown.Leaves develop brown spots with dark borders, often in a circular pattern, eventually expanding to cover the entire leaf.Prior to its discovery in the USA, boxwood blight was known in New Zealand, the UK and Europe since the 1990s.Since then, it has been found in many states in the east, as well as in Ohio, Oregon, and in Canada. This disease was first discovered in the USA in Fall 2011, on boxwood in Connecticut and North Carolina.Buxus sempervirens may be more susceptible than other species. Susceptibility of other plants in the Boxwood family (Buxaceae) is unknown. Laboratory tests by the Connecticut Agricultural Experiment Station indicate that the ground cover Pachysandra terminalis) is also susceptible. Scientific Name: Cylindrocladium pseudonaviculatum ( Cylindrocladium buxicola, Calonectria pseudonaviculata)Ĭommon Name: Boxwood Blight, Box Blight, Cylindrocladium box blight, blight disease of boxwood, boxwood leaf dropīoxwood species ( Buxus spp.), including cultivars, Sweet Box ( Sarcococca spp.).
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