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Stubby-Root Nematodes
and Corky Ring Spot of Potato

September 2017

By George W. Bird, Ph.D.
Professor of Nematology
Michigan State University
Phone: 517-353-3890

Watch Presentation (20 min 47 sec)

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Summary: Corky Ringspot is a serious infectious disease of potato. When present, tuber losses can be as high as 50%. The primary symptoms are characteristic concentric rings on tuber skin and internal tissues. The disease is caused by the Tobacco Rattle Virus and vectored by Stubby-Root Nematodes. The virus has a wide host range and stubby-root nematodes are often found at soil depths greater than 12 inches. This presentation is designed to assist potato growers, professional consultants and other practitioners, throughout all potato growing regions, in understanding and managing Corky Ring Spot. It contains information about symptoms of the disease, Tobacco Rattle Virus, Stubby-Root Nematodes and how to sample for this nematode, in addition to the management strategies of containment, exclusion and nematode population control. Special reference is given to chemical and biological control options and the topic of soil health. After hearing this presentation, members of the potato growing community should have a general overall understanding of the nature of Corky Ring Spot and options for managing this key disease.

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