Boxwood disease can include a number of factors causing the health of boxwoods to decline, including fungi, cold injury, drought stress or nematodes. Boxwood disease and its ability to thrive is often closely related to soil pH and nutritional problems, as well as problems with irrigation, drainage and mulch management.
Root rot and leaf blight are two common ways that boxwood disease manifests itself. Leaves dropping prematurely, spindly branches and cankers on the branches are all signs of a boxwood disease. In some cases, more than one type of disease can occur at once. Practicing proper growing procedures can help to minimize disease, and diseases can be confirmed by sending samples to a local extension office for testing.