![]() ![]() ![]() As noted above, it’s very infectious and spreads quickly. Once established, boxwood shrubs are very drought-tolerant. In the photo below, the problem is just beginning - you can see a small browned out area on the hedge on the left side and the one in the foreground looks slightly yellow. Mulch with an inch or so of chopped leaves to help keep soil cool (but don’t heap mulch against the stems). Spores are easily spread to other nearby boxwood so quick identification of the pathogen is essential in limiting the spread of the fungus. When temperatures rise above 84☏, the disease is suppressed. Since its introduction, the disease has spread throughout the United States. Boxwood blight is a fungal disease that thrives in wet and humid environments with temperatures ranging from 60 to 80☏. from Connecticut and North Carolina in the fall of 2011. The disease was first reported in the U.S. The fungus can begin to produce infectious spores in a matter of days after symptoms first develop. Boxwood Blight, caused by Calonectria pseudonaviculata, is a destructive disease that affects all Buxus species and cultivars. Here are a few key facts about boxwood blight: (taken from Cornell CooperativeExtension site)Ī disease caused by the fungus Calonectriapseudonaviculata.Ĭan cause leaf spots, twig lesions, shedding of foliage and death of the infected plant. Maybe my story will be helpful to some of you. At first they just looked mildly stressed, like many other things at the end of the season.īlight is really hard to diagnose - at first it looks like it could be a number of things. Boxwood blight is new fungal disease which is not cured by any current fungicides. This fungal disease is caused by the fungus. Until the end of last summer, I thought they were bulletproof. Since then, Boxwood Blight has been found in 27 states, including Central Kentucky (first discovered in in 2014). The fungus Calonectria pseudonaviculata (Cylindrocladium pseudonaviculatum) causes severe defoliation and death of container grown boxwoods. These were supposedly not susceptible and for the past ten years have have performed beautifully. Boxwood blight has crept into the four hedges of Boxwood sempervirens ‘North Star’ that outline my front beds. All is not sweetness and light in my garden this spring. ![]()
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