Biological Control of Black Rot (Xanthomonas Campestris Pv. campestris) of Brassicas with an Antagonistic Strain of Bacillus Subtilis in Zimbabwe |
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Authors: | Ednar G. Wulff Cames M. Mguni Carmen N. Mortensen Chandroo L. Keswani John Hockenhull |
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Affiliation: | (1) Institute of Plant Biology, Plant Pathology Section, The Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C., Copenhagen, Denmark;(2) Present address: International Potato Center, Apartado 1558, Lima 12, Peru;(3) Department of Research and Special Services, Plant Protection Research Institute, P.O. Box CY 550, Harare, Zimbabwe;(4) Danish Government Institute of Seed Pathology for Developing Countries, Thorvaldsensvej 39, DK-1871 Frederiksberg C., Copenhagen, Denmark |
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Abstract: | Biological control efficiency of an antagonistic, endophytic strain of Bacillus subtilis (strain BB) was evaluated against three strains of the black rot pathogen, Xanthomonas campestris pv. campestris (Xcc), in four Brassica crops (cabbage, cauliflower, rape and broccoli) grown during three consecutive growing seasons and on two soil types, in two different areas in Zimbabwe. Strain BB controlled the disease caused by strain Xcc B-147 in all Brassica crops during the dry and short rainy seasons. A similar effect was observed in cabbage using the strain Xcc 33908. Biological control was effective in broccoli, but not in cabbage and rape during the main rainy season in clay loam soil and limited biological control effect was still observed when these crops were grown in sandy loam soil. The endophytic colonisation of cabbage roots by strain BB was confirmed by immuno-blotting during the whole growing season. Biological control of black rot with strain BB is discussed in relation to its effect on Xcc strains, Brassica crops and to the effect of weather and soil conditions. |
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Keywords: | Bacillus black rot biological control Brassica endophytes |
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