The residual activity of fungicides is affected by amount of rainfall, weathering, and degradation, and they must be reapplied at regular intervals while the risk of blight infection is present. They should also consider decreasing the frequency of sprays during periods of weather conditions unfavorable to the disease.įungicide applications should begin in the spring when conditions become favorable for infection. A gardener should consider increasing the frequency of the sprays under conducive weather patterns and discovery of spread of Boxwood Blight. A schedule such as this has proved to be very effective, particularly if there are minimal infected plants in the area. Depending on weather pressure, a spray schedule of once a month during the highest-pressure periods would greatly reduce symptoms of Boxwood Blight. If a garden has susceptible cultivars, a gardener should consider an abbreviated fungicide spray schedule. Obtain the latest fungicide recommendations from your state Cooperative Extension service. A goal of a gardener might be to spray a boxwood just enough that Boxwood Blight does not defoliate a significant amount of the foliage. To spray boxwood in a garden every two weeks throughout warm weather would be an expensive and time-consuming exercise. While nurseries have zero tolerance for Boxwood Blight, perhaps a small amount is okay in a landscape if it does not take away from the overall looks of a plant.
Therefore, a slightly blemished plant might be in a garden for many, many years if it continues to have the WOW Factor. For a plant to live indefinitely in a garden, it does not have to be perfect, but it must be attractive. Landscapes and gardens are different from nurseries in that they are the end-user of nursery plants. If severe outbreak of Boxwood Blight occurs, and site lacks proper air movement, consider other options. If Boxwood Blight shows up, follow Best Management Practices to quickly and decisively stop the infection.Īpply fungicides to highest risk plants if resources are available. Heavy shading and slow drying areas are more conducive to Boxwood Blight.Īvoid more susceptible cultivars when replanting. Is Boxwood Blight pathogen already on site from previous planting? If so, other BMP’s must be strictly adhered to for the boxwood garden to succeed, regardless of the cultivar used.Īvoid sites where air movement is blocked by other buildings/ plants/ flowers/ trees. When planting a site, old or new, consider these factors before planting boxwood. Mulch at least 1” every year, but with a thin application after initial mulching.Īvoid transient landscape contractors and mowers who work in other boxwood gardens. Only receive boxwood from reputable sources. The following is a short list of Best Management Practices (BMPs) to avoid/mitigate Boxwood Blight in a home garden or commercial landscape.
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