First Report of Stemphylium globuliferum Causing Stemphylium Leaf Spot on Alfalfa (Medicago sativa) in the United States.

Stemphylium leaf spot occurs in most areas where alfalfa (Medicago sativa) is grown. In the United States, Stemphylium botryosum is reported to be the predominant pathogen (1), although S. vesicarium and S.