A semi-selective medium for detection, isolation and enumeration of Erwinia carotovora ssp. carotovora from plant materials and soil

Authors

  • BS Bdliya,

    Corresponding author
    1. Department of Crop Science, Faculty of Agriculture, University of Maiduguri, PMB 1069, Borno State, Nigeria.
    • Department of Crop Science, Faculty of Agriculture, University of Maiduguri, PMB 1069, Borno State, Nigeria.
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  • E Langerfeld

    1. Institut für Pflanzenschutz in Ackerbau und Grunland der Biologischen Bundesanstalt für Land- und, Forstwirtschaft (BBA), Messeweg 11/12, D-38104, Braunschweig, Germany
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Abstract

Using a modified crystal violet sodium polypectate (CVPB) double layer medium with 2,3,5-triphenyltetrazolium chloride and L-asparagine in the basal medium and bromthymol blue in the upper, both containing tryptone, gave red to pink colonies of Erwinia carotovora ssp. carotovora on a blue green background with cavity formation. The addition of 1.2 μg/ml polymyxin B sulphate to the upper layer inhibited the growth of Erwinia carotovora ssp. atroseptica, while 32 μg/ml erythromycin in the upper layer inhibited the growth of E. chrysanthemi. The addition of 35 μg/ml novobiocin inhibited the growth of Bacillus sp. Non-target bacteria such as Pseudomonas fluorescens, P. marginalis, Ralstonia solanacearum and E. herbicola formed pink, red, yellowish or white colonies without cavity formation. The growth of non-target bacteria on the semi-selective medium was one tenth of that obtained using CVPB medium. Copyright © 2005 Whurr Publishers Ltd.

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