Cylindrocladium buxicola is a fungal pathogen that primarily affects boxwood plants, causing a disease known as boxwood blight. This fungus thrives in warm, humid conditions and can spread rapidly, leading to significant damage to affected plants. Symptoms include dark, water-soaked lesions on leaves and stems, which can eventually result in defoliation. The disease can be particularly problematic in landscapes and gardens where boxwood is a popular ornamental shrub. Effective management strategies include removing infected plants, improving air circulation, and applying fungicides when necessary to control the spread of the fungus.