Number of experiments needed to determine wheat disease phenotypes for four wheat diseases

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dc.contributor.author Bockus, William W.
dc.contributor.author Su, Zhaohui
dc.contributor.author Garrett, Karen A.
dc.contributor.author Gill, Bikram S.
dc.contributor.author Stack, James P.
dc.contributor.author Fritz, Allan K.
dc.contributor.author Roozeboom, Kraig L.
dc.contributor.author Martin, T. Joe
dc.date.accessioned 2012-05-31T13:44:55Z
dc.date.available 2012-05-31T13:44:55Z
dc.date.issued 2012-05-31
dc.identifier.uri http://hdl.handle.net/2097/13878
dc.description.abstract Disease phenotypes for winter wheat cultivars were determined in numerous inoculated greenhouse and field experiments over many years. For four diseases, Fusarium head blight, tan spot, Septoria leaf blotch, and Stagonospora leaf blotch, at least 20 cultivars each had been evaluated in a minimum of five experiments. Reference cultivars of known disease reaction were included in each experiment, which allowed transformation of the percent disease severity data to a 1-to-9 scale for comparisons between experiments. Variations in scale values obtained for individual cultivars among the different experiments were used to calculate standard deviations for disease phenotype data. Standard deviations were used to calculate the number of experiment repetitions needed within each disease to achieve different levels of accuracy (margins of error). A margin of error of ±1.5 for the 1-to-9 scale was chosen as the best level of accuracy. Rounding values within this range would put the estimated disease phenotype within ±1 unit of the actual phenotype. To achieve a margin of error of ±1.5 for Fusarium head blight, tan spot, Septoria leaf blotch, and Stagonospora leaf blotch would require a mean that was calculated from a minimum of five, five, seven, and eight experiments, respectively. Personnel who report disease phenotype data to wheat producers or breeders should be aware of the number of experiments upon which they are basing their reports and adjust any disclaimers accordingly. Similarly, wheat breeders should be aware of the inherent variability in phenotyping these four wheat diseases and make appropriate adjustments to their selection protocols. With a minimum of five experimental repetitions, disease phenotype values obtained from inoculated greenhouse and field experiments had very high correlations (r = 0.81 to 0.92, P < 0.0001) with published Kansas State University Research and Extension ratings obtained from commercial fields. en_US
dc.relation.uri http://apsjournals.apsnet.org/doi/abs/10.1094/PD-91-0103 en_US
dc.subject Wheat en_US
dc.subject Disease phenotypes en_US
dc.subject Fusarium graminearum en_US
dc.subject Septoria tritici en_US
dc.title Number of experiments needed to determine wheat disease phenotypes for four wheat diseases en_US
dc.type Article (publisher version) en_US
dc.date.published 2007 en_US
dc.citation.doi doi:10.1094/PD-91-0103 en_US
dc.citation.epage 108 en_US
dc.citation.issue 1 en_US
dc.citation.jtitle Plant Disease en_US
dc.citation.spage 103 en_US
dc.citation.volume 91 en_US
dc.contributor.authoreid kgarrett en_US
dc.contributor.authoreid bockus en_US
dc.contributor.authoreid bsgill en_US
dc.contributor.authoreid jstack en_US
dc.contributor.authoreid akf en_US
dc.contributor.authoreid kraig en_US
dc.contributor.authoreid jmartin en_US

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