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Multi-seasonal population dynamics of Burkholderia cepacia in organic soils cropped to onion, and the influence of non-onion crops



Multi-seasonal population dynamics of Burkholderia cepacia in organic soils cropped to onion, and the influence of non-onion crops



Phytopathology 93(6 Supplement): S34



Burkholderia cepacia, currently the most important bacterial pathogen of onions in New York, infects at the leaf axil causing bacterial canker and, as infection advances into the bulb, causes sour skin. Onion field surveys spanning four consecutive seasons showed a transient rise in B. cepacia populations as each season progressed, establishing baseline levels and a trend for comparison. Similar surveys of soils historically planted to non-onion crops, and to onions rotated with other crops, found lower levels of B. cepacia. Surveys of onion fields where winter cover crops had been planted suggest that some species may be useful in suppressing B. cepacia populations. We have utilized a miniculture procedure to screen for additional crop species that influence the rhizosphere population of B. cepacia in naturally infested organic soils. Some crops impacted bacterial populations, thus supporting the hypothesis that cultivation of non-onion crops or winter cover crops reduces soilborne inoculum, and represents a useful strategy for disease control.

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Accession: 035349493

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