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Comment on the Reinstatement of Xanthomonas citri (ex Hasse 1915) Gabriel et al. 1989 and X. phaseoli (ex Smith 1897) Gabriel et al. 1989: Indication of the Need for Minimal Standards for the Genus Xanthomonas

¹Plant Protection, Department of Scientific and Industrial Research, Private Bag, Auckland, New Zealand
²CAB International Mycological Institute, Ferry Lane, Kew, Surrey TW9 3AF, United Kingdom
³Station de Pathologie VÉgÉtale-PhytobactÉriologie, Institut National de la Recherche Agronomique, Route de Saint-ClÉment, BeaucouzÉ, 49000 Angers, France
⁴Institute of Microbiology and Virology, Ukrainian Academy of Sciences, 252143 Kiev, Ukraine, USSR
⁵ADAS Central Science Laboratory, Ministry of Agriculture, Fisheries and Food, Hatching Green, Harpenden, Hertfordshire AL5 2BD, United Kingdom
⁶Department of Plant Pathology, Shizuoka University, 836 Ohya, Shizuoka 422, Japan
⁷Department of Plant Pathology, University of Nebraska—Lincoln, Lincoln, Nebraska 68583-0722

^* Corresponding author.

ABSTRACT

The proposals to reinstate Xanthomonas citri (ex Hasse 1915) Gabriel et al. 1989 and X. phaseoli (Smith 1897) Gabriel et al. 1989 are examined in terms of conventional criteria for describing new species. We suggest that the descriptions presented are insufficient in terms of modern practice for the purposes of formal classification in the genus Xanthomonas. To create guidelines for future reinstatements, the Judicial Commission of the International Committee on Systematic Bacteriology is requested to arrange for the preparation and promulgation of minimal standards for Xanthomonas. The pathovars proposed, X. campestris pv. aurantifolii Gabriel et al. 1989 and X. campestris pv. citrumelo Gabriel et al. 1989, are considered to be defective in terms of the International Society for Plant Pathology's standards for naming pathovars.