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Celery grown in muck soil near Thedford, Ont., is subject to a storage rot caused by a fungus, Ansatospora macrospora (Osterw.) Newhall. A 10-year investigation has shown that damage varies from nothing to complete destruction of the stored celery. Losses are usually small during the first two months of storage; they increase with time and may be complete in four months. Most of the losses are caused by lesions that develop in the celery butts.The work reported followed two major courses: the life history of the organism and practical control of the disease. The latter was obtained by dipping the trimmed butts of celery at harvest in a watery mixture of phenylmercuric acetate.