Dry Rot of Rutabaga Caused by Fusarium avenaceum

Author:

Peters Rick D.,Barasubiye Tharcisse,Driscoll Joanne

Abstract

The rutabaga, also known as the swede turnip, is grown on ≈2000 ha in Canada. During the spring of 2006, a grower in Prince Edward Island noticed an advanced level of decay in his stored rutabagas (cv. Thompson Laurentian). About 80% of the stored crop was affected. Lesions on the surface of affected roots were circular to ovate and ranged in size from 10 to 50 mm. The lesions were light brown, with dark borders and some concentric zones evident near the perimeter of the affected tissue. Root tissue within the lesions was shrunken and often wrinkled. Sectioning the root through the lesion revealed an internal advancing dry rot, with an irregular border and cavities that contained white mycelium. Isolation from diseased tissues yielded fungal cultures, which were determined to be Fusarium avenaceum using morphological and molecular criteria. Successful completion of Koch's postulates determined that F. avenaceum was indeed the causal agent of rutabaga dry rot. To the authors’ knowledge, this is the first report of F. avenaceum causing disease in rutabaga in Prince Edward Island, and likely only the second observation of its occurrence in North America. Dry rot, incited by F. avenaceum, may need to be considered as part of the spectrum of postharvest pathogens of rutabaga.

Publisher

American Society for Horticultural Science

Subject

Horticulture

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