The disease has another name … Once introduced into the landscape, spores of the pathogen are produced on the infected twigs. The plants we hoped would be all-round problem solvers have a new problem, however: a fungal disease called boxwood blight (Cylindrocladium buxicola), which has been found in … Figure above: The Spectro treatment (center block of 6 plants) was one of the most effective chemistries during our May/June 2013 trial. This disease is caused by an opportunistic fungal pathogen that attacks leaves and stems of damaged or stressed plants. There are several major common diseases. The fungus can be transferred from other plants (often before they show signs of infection), on tools or even in vehicles that transport plants. Like many other ornamental plants, boxwood often suffers from various diseases. The first symptoms begin as leaf spots followed by rapid browning and leaf drop starting on the lower branches and moving upward in the … Treatment. By last year it had shown up in ten states, including Massachusetts. The imperfect stage is Volutella buxi. Group 9 + 12 fungicide. Boxwood Blight is a fungal disease (Calonectria pseudonaviculata) that affects all top growth of the plants that it has infected. Sometimes called boxwood blight, it is actually caused by two different strains of fungi, both believed to lie dormant in dead leaves and produce spores as temperatures rise through spring. Boxwood blight is new fungal disease which is not cured by any current fungicides. All species and varieties of boxwood are considered susceptible with English and American boxwood being most severely affected. Each infection requires specific treatment, so be sure you have correctly identified the source of infection before you begin a treatment regimen. These spores are then spread by splashing rain and overhead irrigation water. Once the fungus has been introduced into the landscape, spores can be easily spread by splashing water (e.g., rain or sprinklers), wind or contaminated gardening tools (e.g., pruners, shovels, gloves). Photo: Dave Clement. Canker disease is a fungus that attacks different stems of a plant. Winter injury, poor vigor, and stem wounds increase risk for Volutella blight. Each of these should be controlled if infestation is severe or intolerable. There is a new disease to look out for in Virginia boxwoods. 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. Boxwood blight is a fungal disease that affects plants in the boxwood family (Buxaceae).It is caused by the fungal pathogen Calonectria pseudonaviculata (syn. The most common and most important diseases observed in boxwoods are root diseases that cause a gradual and irreversible decline of the plant. Our beautiful boxwoods are under attack by a new disease. While some boxwood appears to be more susceptible than others, all species can be affected by this pathogen as well as Pachysandra (Japanese Spurge) and Sarcococca (Sweetbox). Dept. The disease is caused by two genetic types of fungi, Cylindrocladium buxicola and Volutella buxi, that attack the leaves and stems of the plant. Test first on a small section before applying on the whole plant to evaluate possible phytotoxicity. Common pests include leafminer, mites, and psyllid. Sep 13, 2013 - Boxwood blight is a new, serious disease of boxwood. Once the fungus has been introduced into the landscape, spores can be easily spread by splashing water (e.g., rain or sprinklers), wind or contaminated gardening tools (e.g., pruners, shovels, gloves). Boxwood diseases and their treatment. Boxwood blight is a serious fungal disease that plagues boxwood plants in some areas. Contact your local cooperative extension office for help with accurate identification. Check out these pictures to help identify boxwood blight on your plants, or possibly rule out another infection. There are no treatments to cure boxwood blight. The pathogen causes rapid defoliation of leaves and dieback of stems. Diseases of Boxwood. It causes boxwood leaves to drop off, and can also make the bushes die back. There is no known cure. Boxwood leaf spot. Volutella blight is very similar in appearance to boxwood blight, a fatal fungal disease that also causes twig blight and leaf spots. The leaves will also change color from light green to tan and start to curl inward towards the stems. Leaves that are infected tend to have small rose-colored splotches of the fungus. ), and sweetbox (Sarcococca spp. The fungus that causes boxwood blight can infect all above ground portions of the shrub. They are dying and I don’t know why. Infected branches die back. Diagnosing and Treating Boxwood Blight Boxwoods are the go-to shrub for many homeowners that want an attractive living boundary around some part of their property. ).There is no cure for boxwood blight, so infected … Can be used in the landscape and many other sites. Defoliation is the most obvious sign of infection with boxwood blight. Cylindrocladium buxicola) This aggressive disease is more of a threat to boxwood performance in the landscape than any other disease of boxwood since it may destroy all the shoots and leaves of an infected plant . Both American and English boxwood are susceptible to this disease caused by the fungus, Pseudonectria rouselliana. The slow-growing evergreen shrub makes a lovely and long lasting hedge row that is easily maintained, unfortunately it can be wiped out very quickly by a terrible disease called Boxwood Blight. History of Boxwood Blight. Boxwood blight is a disease caused by the non-native fungus Calonectria pseudonaviculata. Samples of boxwood with unusual symptoms were submitted for diagnosis and after extensive microscopic examination and a search of the literature, the disease was tentatively identified as boxwood blight, caused by the fungus Cylindrocladium pseudonaviculatum. 2 ) that progress to twig blight and rapid defoliation (Fig. 12-hr reentry. Boxwood Blight (Calonectria pseudonaviculata) The disease is caused by a fungus called Cylindrocladium pseudonaviculatum (synonym: Cylindrocladium buxicola).