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19 lip 2024 · I know from experience that dealing with boxwood blight requires a two-pronged strategy: prevention and treatment. To preempt infection, I focus on environmental management, such as avoiding overcrowding and ensuring good air circulation.
Fungicides should be applied every 7 to 14 days through the growing season to protect susceptible boxwoods. Treatment may be necessary for the next 3 to 5 years. For fungicides that provide preventative management or are labeled for your state, contact your local arborist.
Find out how to identify, and treat, box blight in your garden. Box blight (Cylindrocladium buxicola) is a fungal disease that affects box (Buxus) plants. It first appeared in Britain in 1998 and is worst in warm, humid conditions. Box blight causes leaf browning and stem dieback.
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Boxwood blight disease is caused by the fungal plant pathogen Calonectria pseudonaviculata. This disease has been confirmed to be in Ohio's landscape. This fungus infects several members of the Buxaceae family including boxwood (Buxus spp.), Japanese spurge (Pachysandra terminalis), Allegheny spurge (P. procumbens), and sweetbox (Sarcococca spp.).
The following pages are excellent resources for information about Boxwood Blight and other common pathogens of Boxwoods, including Volutella Blight, Boxwood Leafminer, and more. If you suspect you have a pathogen on your Boxwood plant, please contact us or send a sample in for examination.
How to use fungicides to manage box blight effectively: Apply prior to cutting out infected areas to minimise spread of live box blight spores; Apply after cutting at, and adjacent to, sites of infection to clear up latent infections and protect new and uninfected growth
