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[3] It’s at risk for a number of diseases, though. There is no boxwood disease treatment for root rot, and it will kill the plant. History. [9] 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. Volutella canker – Also known as volutella blight, it is one of the boxwood bush diseases that makes leaves turn yellow and die. Douglas, p. 6, calls this "Trojan horse " or "Typhoid Mary" transmission. Keep reading to learn more about diseases affecting boxwoods and how to go about treating boxwood diseases. Put down new mulch to prevent spores from splashing up from the soil, and apply fungicide. Nematodes – Nematodes are not so much diseases in boxwood as microscopic worms that eat through the roots. 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). Fungicides may prevent the spread of the disease. The blight initially presents as dark or light brown spots or lesions on leaves. [11], Milius quotes Lynn R. Batdorf, curator of the. are broad-leaved evergreen, deer-resistant shrubs that are typically used as foundation plantings and backdrops for planting beds, topiaries, and formal gardens.There are many species and cultivars available. 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These are now known to be the same. 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. If decline occurs, don’t plant new boxwoods in the same spot. 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. Cut away and dispose of affected branches and leaves. Photo: Karan A. Rawlins, University of Georgia, Bugwood.org Key Points. It also forms cankers on the wood and, in wet conditions, white fungus all over. 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. Boxwood blight – Blight turns leaves spotty and brown, and may cause them to drop. 2018 in Maine and Michigan, There appears to be some tolerance to the disease within the genus Buxus. It also kills stems and, when wet, produces masses of pink spores. Prevent it by planting resistant plants in well-drained soil and watering sparingly. [4] 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. The first description of boxwood blight was from the United Kingdom in the mid 1990s. Since they are sticky the spores may also be spread by birds, animals, and contaminated clothing and footwear. In October 2011 the blight was found in North Carolina and Connecticut. The leaves typically turn brown or straw color, then fall off. The first description of boxwood blight was from the United Kingdom in the mid 1990s. By January 2012 it had also been identified in Virginia, Maryland, Rhode Island, Massachusetts, Ohio, Oregon, Pennsylvania, New York and British Columbia. Cut away and dispose of affected branches and leaves. Decline – Decline is the name given to one of the more mysterious diseases affecting boxwoods. The boxwood disease treatment in this case consists of pruning back dead material to increase air circulation and applying fungicide. 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.The fungus causing the disease in the UK was later named C. buxicola.These are now known to be the same. 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. The spores remain viable for five years in fallen boxwood leaves,[7] and are dispersed by wind and rain over short distances. The fungus causing the disease in the UK was later named C. buxicola. [6] The disease is often fatal to young plants. [citation needed]. Root rot – Root rot causes the leaves to lighten in color and the roots to darken and rot. 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