![]() ![]() ![]() ![]() pseudonaviculata may be hosted by familiar garden plants as diverse as Alchemilla molis, Arctostaphylos uva-ursi, Brunnera macrophylla, Epimedium youngianum, Galium odoratum, Geranium sanguinium, Phlox subulata, Tiarella, cordifolia, Callirhoe involucrata, Ibiris sempervirens, Mazus reptans and Vinca minor.įederal and State Agencies and horticultural research organizations have reacted with measures to intervene in the spread of this disease. Recent trials by the American Boxwood Society have indicated that C. The same fungal pathogen may cause disease in other Buxaceae family plants, specifically in the genera P achysandra and Sarcacocca. Once blight is detected on your plant it cannot be cured, merely contained. The leaf spots and bark streaks differentiate this blight from other common boxwood diseases. Young branches may exhibit black lesions. The oily, leaf spots enlarge and merge, leaves turn brown or tan, followed by rapid leaf fall. and then becomes inactive at temperatures above 82º. The pathogen is most active at around 75º F. It is now confirmed in 25 states and entire public gardens have been devastated.īoxwood blight, an aggressive fungal disease caused by Calonectria pseudonaviculata, can be identified in your plants by the appearance of dark spots on the leaves in the spring or fall, following a period of rain. Connecticut was among the states to first report a heavy incidence of the disease and our area continues to be strongly affected. Boxwood Blightīoxwood blight was first detected in the United States in 2011 and is gradually spreading across the country. Keep in mind that a single plant may have multiple problems simultaneously, and display symptoms of diseases, insects and of poor care and conditions. Caring for and maintaining your plants properly, as described on the first page of this guide, is the best defense against these diseases. Most of these diseases, other than boxwood blight, affect plants that are weakened by environmental and cultural stressors. It affects all boxwood types as well as the related plants Sarcococca and Pachysandra and potentially others.īut boxwoods are susceptible to numerous diseases, some of which are common in the New York area. Of current, intense concern, boxwood blight is an aggressive fungal disease caused by Calonectria pseudonaviculata. Plant discoloration and decline, in whole or in part, is frequently a problem of care and environment but also may be disease-rooted. The telltale dark spots of boxwood blight ( Calonectria pseudonaviculata) photo courtesy of Flickr cc/ Orgeon Department of Agriculture ![]()
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