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Lookup NU author(s): Professor Giles Budge,
Professor Neil Boonham
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An extensive study was conducted to determine where in the production chain Rhizoctonia solani became associated with UK module-raised Brassica oleracea plants. In total, 2600 plants from 52 crops were sampled directly from propagators and repeat sampled from the field. Additional soil, compost and water samples were collected from propagation nurseries and screened using conventional agar isolation methods. No isolates of R. solani were recovered from any samples collected from propagation nurseries. Furthermore, nucleic acid preparations from samples of soil and compost from propagation nurseries gave negative results when tested for R. solani using real-time PCR. Conversely, R. solani was recovered from 116 of 1300 stem bases collected from field crops. All the data collected suggested R. solani became associated with B. oleracea in the field rather than during propagation. Parsimony and Bayesian phylogenetic studies of ribosomal DNA suggested the majority of further classified isolates belonged to anastomosis groups 2-1 (48/57) and AG-4HGII (8/57), groups known to be pathogenic on Brassica spp. in other countries. Many R. solani isolates were recovered from symptomless plant material and the possibilities for such an association are discussed. © 2009 Food & Environment Research Agency, UK.
Author(s): Budge GE, Shaw MW, Lambourne C, Jennings P, Clayburn R, Boonham N, McPherson M
Publication type: Article
Publication status: Published
Journal: Plant Pathology
Print publication date: 01/12/2009
Online publication date: 02/08/2009
ISSN (print): 0032-0862
ISSN (electronic): 1365-3059
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