Even if not entirely killed, a shrub’s value as an ornamental is often destroyed by boxwood blight. Whether or not your boxwood dies from the infection depends on plant vigor, weather, and factors such as irrigation type and shading. This is followed by severe leaf drop, either on a section of the shrub or the entire shrub.īoxwood Blight cannot be eliminated with fungicides but it can be treated to slow its spread to healthy plants. You can identify Boxwood Blight by dark or light brown spots on the leaves and dieback on stems girdled by black cankers (see image). The spores can also be transmitted through pachysandra, which is also a host. However, Boxwood Blight is much more devastating and can take out complete plantings. It is caused by Calonectria pseudonaviculata, a fungus that can be confused with similar-looking forms of dieback in boxwood. Recently, this disease has become particularly widespread in Westchester County (NY), Fairfield County (CT) and Bergen County (NJ) landscapes. Since then, it has spread to several other states and Canada. in 2011 in Connecticut and North Carolina. ![]() Boxwood blight however is by far the most serious of these issues and we are seeing a surge in our region.īoxwood Blight is a relatively new fungal disease that has only been around globally since 1994. It is known to get infected by a number of plant diseases, including boxwood blight, boxwood dieback, macrophoma blight, phytophthora root rot and Volutella blight, as well as some common pests such as boxwood leafminer and psyllid. Program document for more information on how to enroll.īoxwood Blight Cleanliness Program Participant list 2022-2023Ģ022BoxwoodBlightCompliancProgramParticipants.What you can do to protect your shrubs.īoxwood (Buxus sp.), because of its vibrant green color and woody evergreen growth, is an important but frequently over-utilized ornamental shrub on some landscapes. Procedures is designed to help a nursery provide clean boxwood nursery stock to This voluntary program of inspections and best management Nursery Cleanliness Program for Boxwood Blight In Canada, it has been found in British Columbia, Ontario, and Quebec. In the US, 16 states have reported boxwood blight: Alabama, Connecticut, Delaware, Georgia, Kentucky, Maryland, Massachusetts, New Jersey, New York, North Carolina, Ohio, Oregon, Pennsylvania, Rhode Island, Tennessee, and Virginia. Seedlings, but may also take place in older plants, especially if infected withīoxwood blight has been reported throughout Europe, the United Kingdom, and New Zealand. Years on host organic debris in the soil. Resting structures (chlamydospores and microsclerotia) that can survive for Making host plants in greenhouses particularly susceptible. Results in defoliation of leaves and an overall strawĭisease transmission is increased in moist environments,.Black longitudinal or diamond shaped lesions on stems. ![]() Light or dark brown circular leaf spotting.The boxwoodįamily Buxaceae and a member of this family, Sarcococca, have been shown to be ![]() Middlesex County, Connecticut in October 2011.Īll boxwood species may be susceptible to blight, howeverĪmerican boxwood varieties appear to be particularly vulnerable.
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