Abstract
Hamedan province of Iran is a suitable niche for alfalfa growth but many diseases including alfalfa bacterial wilt, bacterial crown and root rot diseases cause economic crop losses. Bacterial wilt is caused by Clavibacter michiganensis subsp. insidiosus, and bacterial crown and root rot diseases are caused by Pseudomonas viridiflava. In this study, we investigated the pathogenicity of C. michiganensis subsp. insidiosus and P. viridiflava strains collected from the main alfalfa growing areas of Hamedan province. Pathogenicity of the virulent strains was tested on alfalfa and the bacterial strains caused symptoms, and data were collected about stem length, root length, wet weight and dry weight of the infected plantlets. The data about the pathogenicity of C. michiganensis subsp. insidiosus and P. viridiflava on alfalfa were compared with each other and were analysed by SAS software and Dunkan's test. Resulted data showed more pathogenicity of C. michiganensis subsp. insidiosus than P. viridiflava on alfalfa. These data also showed that both of these bacteria produced the most losses on wet weight and dry weight of alfalfa plantlets.
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