12/23/2023 0 Comments Boxwood blight treatment![]() Under moist, humid conditions, the foliage may develop distinct masses of pink to salmon colored spores (Photo 2).įusarium cankers on boxwood do not appear to be common in the landscape. Volutella progresses down the stem, whereas winter injury happens seemingly at once. Infected leaves turn tan, straw-yellow or bronze color in the spring. This fungal pathogen is often associated with stem and leaf tissues damaged from winter injury. Volutella Blight (Volutella buxii (asexual stage of Pseudonectria rouselliana)) The disease can easily be identified by the numerous black, raised fruiting bodies found on dead or dying leaves (Photo 1).įruiting bodies of Macrophoma Leaf Spot on boxwood. Macrophoma is a weak pathogen that causes leaf spots and straw colored leaves. Macrophoma Leaf Spot (Macrophoma candollei) Snow insulates and protects foliage from desiccating winds and extreme cold temperatures. A "snow line," or distinct line that separates the healthy green bottom from the damaged brown top can also be an indication of winter injury. Injury is most likely to occur southwest and windward facing sides of the plant. The pattern of injury can also be helpful in diagnosing winter injury. Depending on a plant's hardiness, location, and the weather conditions, winter injury can damage the entire plant or just the branch or leaf tips causing leaves to become pale yellow/reddish bronze. Frozen soil prevents the plant from taking up water resulting in "freeze-dried" burn symptoms. Winter injury occurs as cold, dry winter winds and/or direct sunlight causes moisture loss from the evergreen leaves. While these businesses may offer plant advice as a service to their customers, they are extremely cautious, and go to great lengths not to introduce or spread this disease. ![]() Never take a suspected boxwood blight sample to garden center, nursery, or other areas that may grow or distribute boxwood. If you suspect this boxwood blight, we recommend you contact the University of Illinois Plant Clinic for information on how to submit a sample. Fortunately, theses look-alikes cause relatively minor injury that can be pruned out during a dry period of spring weather.īoxwood blight is a regulated plant disease in Illinois. Some of the common boxwood blight look-alikes include winter Injury, macrophoma leaf spot, volutella blight, fusarium canker, boxwood leafminer, and potentially boxwood psyllid. A microscope is needed to confirm the disease diagnosis. Boxwood blight causes extensive defoliation, while look-alike disorders tend to have leaves turn tan to brown, but remain attached to the plant. One major difference between boxwood blight and its look-alikes is the potential for defoliation. Many of the symptoms associated with the disease are similar to other common boxwood disorders. Boxwood blight can be a challenging disease to identify outside a plant diagnostic laboratory. ![]() With the recent detections of boxwood blight in Illinois, the importance of scouting landscapes and new plants for the disease is greater than ever.
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