Spring Black Stem is a common fungal, foliar disease caused by Ascochyta medicaginicola (syn. Phoma medicaginis). Spring Black Stem is most commonly found in alfalfa, but also attacks certain clovers. The fungus survives in stubble from previous cuttings and spreads easily by rain splash, running water, and equipment. The disease is present in numerous alfalfa fields throughout the Northeast United States.
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