![]() ![]() For fungicides that provide preventative management or are labeled for your state, contact your local arborist. Treatment may be necessary for the next 3 to 5 years. Removing soil to a depth of 8” to 12” may help eliminate disease inoculumįungicides should be applied every 7 to 14 days through the growing season to protect susceptible boxwoods.Remove fallen leaves as the pathogen can survive in plant debris for up to 5 years.Once the pathogen is detected, immediately remove the entire plant.Sterilize pruning and shearing equipment before moving to a new area.Do not shear boxwoods when they are wet.Monitor boxwoods during growing seasons for symptoms.This disease only affects plants in the Buxaceae. Hold new boxwoods for three weeks before planting and look for symptoms Boxwood Blight is caused by the fungal pathogen Calonectria pseudonaviculata (syn.Purchase boxwoods from a reputable nursery The fungus Calonectria pseudonaviculata (Cylindrocladium pseudonaviculatum) causes severe defoliation and death of container grown boxwoods.Here are some tips for prevention and cultural practices that may help manage the disease: Prevention: Recommendations may change as more is known about disease management. There are currently no curative products available. There are some cultural controls and products that can help prevent disease spread. Prevention is key to managing this disease. ![]() The pathogen can be spread by contaminated tools, clothing, equipment, and infected plants. The fungus overwinters in the soil with the leaf litter. Rain splash and irrigation water transmit the pathogen. White spore masses form on the leaves and stems. Warm, humid conditions will facilitate the spread of the fungus. Repeated infection can result in a weakened plant, which can lead to plant death. The fungus forms black, diamond-shaped lesions on the stem tissue. Infected plant leaves turn brown or yellow and quickly drop from the plant. Initial symptoms include light or dark brown leaf spots often with dark borders. ![]() Boxwood Blight Symptoms:Īll above-ground parts of the plant can become infected. Other susceptible hosts include Japanese and Allegheny spurge (Pachysandra sp.) and sweetbox (Sarcococca sp.). Hosts:īoxwood blight infects all boxwood species the most susceptible hosts are English, American and Korean boxwood. It has been reported in more than 20 states along the east coast and in Canada. The disease is widespread in Europe and was identified in the United States in 2011. Boxwood blight is a serious disease caused by a fungal pathogen, Calonectria pseudonaviculata previously named Cylindrocladium buxicola. ![]()
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