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Development of Sampling Strategies for Pachymetra chaunorhiza, a Sugarcane Root Pathogen. R. C. Magarey, Research plant pathologist, Bureau of Sugar Experiment Stations, P.O. Box 566, Tully, Queensland, Australia 4854; Phytopathology 79:1306-1309. Accepted for publication 23 June 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/Phyto-79-1306.

Sampling procedures associated with an assay for Pachymetra chaunorhiza, a root pathogen of sugarcane in Queensland, Australia, have been established and sampling strategies were investigated. A computer simulation model was used to assess two field-plot sampling strategies using spatial pattern data for P. chaunorhiza. A sequential strategy was developed for sampling laboratory-processed soils using Iwao’s patchiness regression model. Assay variation when thoroughly mixed soils were repeatedly subsampled and assayed also was investigated. Only one assay per soil was found necessary to provide representative results.

Additional keywords: soilborne pathogen, soil oospores, sugarcane root rot.