Viburnum is a genus of about 150 species of deciduous, evergreen and semi-evergreen shrubs or small trees. Widely used in landscape plantings, these versatile plants offer diverse foliage, colorful fruit and attractive flowers. Viburnums are relatively pest-free, but in some parts of the US the viburnum leaf beetle can be a serious pest in both landscape and natural settings. Potential diseases include bacterial leaf spot and powdery mildew.