Ralstonia solanacearum Race 3, Biovar 2

Authored by: Mark Fegan , Alan Christopher Hayward

Manual of Security Sensitive Microbes and Toxins

Print publication date:  April  2014
Online publication date:  April  2014

Print ISBN: 9781466553965
eBook ISBN: 9781466553989
Adobe ISBN:


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Ralstonia solanacearum is a soilborne plant pathogen, widely distributed in the tropics and subtropics, which colonizes the xylem, causing bacterial wilt in a wide range of economically important host plants. Within this diverse species, R. solanacearum race 3, biovar 2 (R3bv2), the principal cause of brown rot of potato, is uniquely adapted to pathogenicity at high elevation in the tropics and cool-temperate environments in the northern and southern hemispheres. R3bv2 has the propensity for distribution in latently infected potato tubers as well as on susceptible geranium cuttings exposed to contaminated irrigation water during propagation. This agent is considered to be a high risk to seed potato production worldwide. In the European Union, R3bv2 has an A2 phytosanitary categorization 1 and is listed as a quarantine pathogen in Canada and as a select agent under the Agricultural Bioterrorism Protection Act of 2002 in the United States. 2

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