![]() ![]() Depending on the specific type of shrub affected, the disease, diagnosis and treatment will all vary. From too little watering to pest infestation, proper disease identification is crucial to the survival of your shrubs. harlandii 'Richard.Homeowners strive to maintain healthy plant life in their gardens and landscapes, but oftentimes shrubs suffer casualties, or fall ill from disease for a variety of reasons. microphylla 'Wintergreen,' B microphylla 'Franklin's Gem,' B. The fungus seems to prefer the most common boxwood known as American or English boxwood ( Buxus sempervirens). If you have a diseased plant, place it in a plastic bag and dispose of it in the garbage bin rather than yard debris recycling bin.Disinfect pruners and hedge clippers after use.Inspect new plants and isolate them from other boxwoods for at least two weeks before planting.Here are Pscheidt's recommendations for preventing the spread of boxwood blight:.Contact (541) 737-3380, on Twitter the blight Kym Pokorny works with the Oregon State University Extension Service. Now that it's made inroads into gardens, cooperation from homeowners is essential. But the disease has jumped into some landscapes in Portland and Coos Bay. By 2011, the disease had been found in nurseries and landscapes in several East Coast states, three nurseries in Oregon and four in British Columbia, Canada.Īccording to Pscheidt, wholesale nurseries in Oregon, which consider boxwood a bread and butter crop, have kept the disease mostly in check with a nursery cleanliness program administered through the Oregon Department of Agriculture. The fungus most likely hitched a ride on plants shipped from Europe to North America. Eradication has been unsuccessful, he said. "That might be hard," Pscheidt said, "but the fungus can be present and the plant hasn't shown symptoms yet."īoxwood blight emerged in Europe in the early 1990s and quickly spread. If the shrubs don't show spots, they can be planted. The most effective method is to inspect purchased plants and keep them in an area away from already planted boxwood for two weeks or more. There is no cure, but prevention measures can help keep the disease from spreading, he said. Stem lesions show up as wide black streaks on leaves they appear as round spots. The sticky fungal spores easily attach to clothing, pruners or other equipment and then transfer to other boxwoods, so avoid working with wet plants.īoxwood blight ( Calonectria pseudonaviculata) causes spots on leaves and stems and eventually defoliates and kills the plants. ![]() Even though this spring has been relatively dry, overhead watering causes the same conditions so the disease can spread like any other year. The fungus is active during warm, wet weather, splashing from plant to plant by rain. "The message to homeowners is that if they notice something unusual going on with their boxwood they've never seen before, it could be boxwood blight," Pscheidt said. Pscheidt, a plant pathology specialist with Oregon State University's Extension Service. A disease that attacks boxwood shrubs could potentially become a serious problem in residential and public gardens in Western Oregon.īoxwood blight, which first showed up in nurseries in Oregon in 2011, is making inroads in the Portland area, according to Jay W. ![]()
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