Stem Blight of Catharanthus rosea (V. rosea, Vinca minor (Periwinkle) and Vinca major (big-leaf or variegated) is caused by the fungus Phoma exigua. Symptoms consist of rapidly expanding, dark brown to black, girdling lesions on stems at the soil line which result in dieback. Stem lesions expand rapidly, spread to the base of new shoots,…