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Botryotinia is a genus of ascomycete fungi causing several plant diseases. The anamorphs (asexual reproductive stage) of Botryotinia are mostly included in the imperfect fungi genus Botrytis. The genus contains 22 species and one hybrid.
Plant diseases caused by Botryotinia species appear primarily as blossom blights and fruit rots but also as leaf spots and bulb rots in the field and in stored products. The fungi induce host-cell death resulting in progressive decay of infected plant tissue, whence they take nutrients.
