Once the disease is on a site, infections can develop and spread rapidly, especially when humidity is high. If you are dedicated to preventing blight, ensure that. 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. Control the airflow and increase it by pruning the lowest branches on surrounding trees and large shrubs. 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. Neither species of boxwood blight have been identified in Minnesota. Calonectria henricotiae has only been identified in Europe. 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. The disease cannot be identified from visual symptoms, due to the fact that similar symptoms can be. This disease is caused by the fungal species Calonectria pseudonaviculata, and can result in complete leaf loss and blight of the plant.
in 2011 (Connecticut) and is now known to occur in 25 states, in both landscape and nursery settings. Boxwood blight, a disease that affects the popular landscape shrub, was first found in Pennsylvania in 2012. The boxwood blight fungus, Calonectria pseudonaviculata, was first found in the U.S.
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).
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