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The proposals to reinstate Xanthomonas citri (ex Hasse 1915) Gabriel et al. 1989 and X. phased (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. Xanthomonas citri (Hasse 1915) Dowson 1939 and X. phaseoli (Smith 1897) Dowson 1939 were originally de- scribed as the pathogens that cause bacterial canker of citrus (Citrus spp.) and common blight of bean (Phaseolus spp.), respectively. These organisms were listed by Dye and Lel- liott (5) as species whose descriptions did not allow them to be distinguished from X. campestris (Pammel 1895) Dowson 1939 or from each other except by host reactions. These species and most of the other Xanthomonas spp. accepted at the time did not fulfill the criteria established for validation in the Approved Lists of Bacterial Names (23). However, the names were retained (4) at the infrasubspecific level as pathovars of X. campestris. Recently, Gabriel et al. (8) proposed reinstatement of X. phaseoli from X. campestris pv. phaseoli (Smith 1897) Dye 1978 as the name for the pathogen of common blight of beans and reinstatement of X. citri as the name for the group A strains of X. campestris pv. citri (Hasse 1915) Dye 1978 which cause Oriental or Asian citrus canker. Gabriel et al. (8) also proposed the pathovar name X. campestris pv. aurantifolii for group B, C, and D strains and the pathovar name X. campestris pv. citrumelo for group E strains of X. campestris pv. citri. CLASSIFICATION The naming of a taxon according to the International Code of Nomenclature of Bacteria (19) presupposes that the taxon has been characterized by a range of methods which are sufficient to classify it as a distinct entity in terms of its overall characteristics and to distinguish it from all other named taxa (18, 21, 25, 26, 28). Published descriptions of

international journal of systematic bacteriology

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