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Página 8 - RYE (Secak cereale). ERGOT (Claviceps purpurea). This fungus disease attacks the ovary and transforms it into a purplish-black mass about half an inch long and an eighth of an inch in diameter. This mass is known as "ergot" and is a storage organ of the fungus. The spring following its formation this "ergot" produces a number of little stalks which bear the spores.