Abstract
A multi-test in vitro system was designed to identify antagonistic micro-organisms of the Allium white rot (AWR) pathogen, Sclerotium cepivorum. Micro-organisms (215) comprising 140 fungi, 58 bacteria and 17 actinomycetes were isolated from AWR soils, pathogen sclerotia and diseased host tissue. Fungi were screened and scored for volatile and non-volatile antibiotic activity, inhibition of sclerotium formation, and overgrowth of colonies of S. cepivorum on agar plates. Bacteria and actinomycetes were screened for antibiotic activity only. Comparisons with known antagonists of plant pathogens were also made. The screens enabled selection of antagonists to be made based on either a ‘total score’ from all tests or on a potential mode of action basis in selected tests. Statistical analysis of total score identified inhibition of sclerotia formation and position of sclerotia formation in dual culture as the most discriminating variates in the screen.
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