Decrease the likelihood of decline by cutting back dead branches and removing dead leaves to encourage air circulation. , There is no known cure. 2018 in Maine and Michigan, There appears to be some tolerance to the disease within the genus Buxus. . Boxwood blight (also known as box blight or boxwood leaf drop) is a widespread fungal disease affecting boxwoods (box plants), caused by Cylindrocladium buxicola (also called Calonectria pseudonaviculata). Keep reading to learn more about diseases affecting boxwoods and how to go about treating boxwood diseases. It also forms cankers on the wood and, in wet conditions, white fungus all over. Under wet conditions, white fungal growth is observed on the … It’s at risk for a number of diseases, though. Boxwood is a very popular evergreen shrub for decorative edges around gardens and homes. Since they are sticky the spores may also be spread by birds, animals, and contaminated clothing and footwear.  The fungus does not need a wound to infect a plant, but it does require high humidity or free water. It also forms cankers on the wood and, in wet conditions, white fungus all over. Put down new mulch to prevent spores from splashing up from the soil, and apply fungicide. Fungicides may prevent the spread of the disease. 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Root rot – Root rot causes the leaves to lighten in color and the roots to darken and rot. In 2002 the disease was discovered in New Zealand, the cause was identified as a new species of fungus which was formally named Cylindrocladium pseudonaviculatum. Nematodes – Nematodes are not so much diseases in boxwood as microscopic worms that eat through the roots. Volutella canker – Also known as volutella blight, it is one of the boxwood bush diseases that makes leaves turn yellow and die. Don’t overwater during the summer, but provide enough water before the frost to give the plant the strength to survive the winter without damage. If decline occurs, don’t plant new boxwoods in the same spot. In general, the boxwood varieties within the species sempervirens tend to be more susceptible to this disease; this would include the most popular varieties 'English' and 'American' boxwood. The leaves typically turn brown or straw color, then fall off. , Milius quotes Lynn R. Batdorf, curator of the. The boxwood disease treatment in this case consists of pruning back dead material to increase air circulation and applying fungicide. The first description of boxwood blight was from the United Kingdom in the mid 1990s. Cut away and dispose of affected branches and leaves. To be effective, they must be applied to the entire plant, leaves and stems, which can be difficult because boxwood leaves are very closely spaced. In October 2011 the blight was found in North Carolina and Connecticut. The spores remain viable for five years in fallen boxwood leaves, and are dispersed by wind and rain over short distances. Nematodes can’t be eradicated, but watering, mulching, and fertilizing regularly can keep them in check. Boxwood blight – Blight turns leaves spotty and brown, and may cause them to drop. History. Prevent it by planting resistant plants in well-drained soil and watering sparingly. Other members of the boxwood family, Pachysandra terminalis (Allegheny spurge) and Pachysandra procumbens ( Japanese pachysandra) as well as member so the Saracoccca species are also attacked by this pathogen. Photo: Karan A. Rawlins, University of Georgia, Bugwood.org Key Points. There is no boxwood disease treatment for root rot, and it will kill the plant.  The fungus causing the disease in the UK was later named C. buxicola. The most common mode of transmitting the blight is by the introduction of asymptomatic plants, or plants treated with fungicide (which can mask the disease) to unaffected areas. Douglas, p. 9 has details on various fungicides, "Boxwood Blight - a new Disease for Connecticut and the U.S.", Connecticut Agricultural Experiment Station Plant Disease Information Office, United States National Agricultural Library, https://en.wikipedia.org/w/index.php?title=Boxwood_blight&oldid=968952263, Articles with dead external links from November 2016, Articles with permanently dead external links, Articles with dead external links from July 2016, Articles with unsourced statements from July 2016, Creative Commons Attribution-ShareAlike License, This page was last edited on 22 July 2020, at 14:16. All boxwood, including the popular English and American varieties, are susceptible to the disease.  Warm and humid conditions facilitate its spread. These are now known to be the same. , Boxwood blight is found throughout Europe, and has spread to North America. It also kills stems and, when wet, produces masses of pink spores. The blight initially presents as dark or light brown spots or lesions on leaves. Decline – Decline is the name given to one of the more mysterious diseases affecting boxwoods. Boxwood blight – Blight turns leaves spotty and brown, and may cause them to drop. Put down new mulch to prevent spores from splashing up from the soil, and apply fungicide.  Other plants within the family Buxaceae, such as Pachysandra terminalis, as well as a Sarcococca species, have also found to be susceptible to this fungal pathogen. Douglas, p. 6, calls this "Trojan horse " or "Typhoid Mary" transmission.