The pathogen can remain viable in infected debris for several years. Once the disease is on a site, infections can develop and spread rapidly, especially when humidity is high. Spread to new areas is mainly through movement of infected plants, but not all infected plants show symptoms, which can make long-distance spread difficult to manage. Since 2018, it has also been found in several residential and commercial landscapes in. ![]() Biologyīoxwood blight is caused by two closely related fungal pathogens that can infect all above-ground plant parts, resulting in leaf lesions, leaf drop, stem lesions and severe dieback. A fungus called Calonectria pseudonaviculata causes boxwood blight. Symptoms of boxwood blight on boxwood ( Buxus spp.) include leaf spots or blotches, rapid defoliation, and stem lesions ( Figs. Neither species of boxwood blight have been identified in Minnesota. The fungus Calonectria pseudonaviculata (Cylindrocladium pseudonaviculatum) causes severe defoliation and death of container grown boxwoods. All boxwood, including the popular English and American varieties, are. Calonectria henricotiae has only been identified in Europe. Boxwood blight is new fungal disease which is not cured by any current fungicides. Cause Boxwood blight caused by the fungus Calonectria pseudonaviculata (synonyms Cylindrocladium pseudonaviculatum or C. in 2011 (Connecticut) and is now known to occur in 25 states, in both landscape and nursery settings. ![]() The boxwood blight fungus, Calonectria pseudonaviculata, was first found in the U.S. For a list of sanitizer recommendations, refer to the Boxwood Blight Task Force website. Boxwood is a broad-leaved evergreen (leaves do not drop in winter) shrub and is sometimes used in decorative wreaths, which can be infected with the disease. Boxwood ( Buxus) is the primary host for boxwood blight, but also infects Pachysandra and sweet box ( Sarcococca). Boxwood blight is a widespread fungal disease affecting boxwoods (box plants), caused by Cylindrocladium buxicola (also called Calonectria pseudonaviculata).
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