Cultivar mixtures for the simultaneous management of multiple diseases: tan spot and leaf rust of wheat

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Show simple item record Cox, C. M. Bowden, Robert L. Fritz, A. K. Dendy, S. P. Heer, William F. Garrett, Karen A. 2012-06-01T13:38:25Z 2012-06-01T13:38:25Z 2012-06-01
dc.description.abstract Because of differences in life histories between Puccinia triticina, a highly specialized, polycyclic, windborne pathogen with a shallow dispersal gradient, and Pyrenophora tritici-repentis, a residue-borne pathogen with a steep dispersal gradient, wheat mixtures are expected to be more effective at controlling leaf rust than tan spot. The objectives of this research were to determine the effect of two-cultivar mixtures with varying proportions and different pathogen resistance profiles on the severity of tan spot and leaf rust, to evaluate yield of the mixtures in the presence or absence of disease, and to directly compare the relative effectiveness of cultivar mixing for tan spot versus leaf rust. In a field experiment at two sites in Kansas over two growing seasons, winter wheat cvs. Jagger and 2145, which have differential resistance reactions to leaf rust and tan spot, each were planted in proportions of 0.25, 0.50, 0.75, and 1.00. Plots were inoculated with each pathogen alone, both pathogens, treated with a fungicide, or exposed to ambient conditions. For both diseases for all siteyears, severity decreased substantially on the susceptible cultivar as the proportion of that cultivar decreased in mixture. Mixtures were significantly more effective at reducing leaf rust than tan spot in three of four site-years. Mixtures generally yielded the same as the weighted mean of components in monoculture although, in two of three site-years, at least one fungicide-treated and one diseased mixture each yielded higher than expected values. Although this particular mixture produced only modest yield benefits, the potential for simultaneous reductions in tan spot and leaf rust was demonstrated. en_US
dc.relation.uri en_US
dc.subject Tan spot en_US
dc.subject Leaf rust en_US
dc.subject Host diversity en_US
dc.subject Plant diversity en_US
dc.subject Polyculture en_US
dc.subject Variety mixture en_US
dc.subject Frequency-dependent effects en_US
dc.title Cultivar mixtures for the simultaneous management of multiple diseases: tan spot and leaf rust of wheat en_US
dc.type Article (publisher version) en_US 2004 en_US
dc.citation.doi doi:10.1094/PHYTO.2004.94.9.96 en_US
dc.citation.epage 969 en_US
dc.citation.issue 9 en_US
dc.citation.jtitle Phytopathology en_US
dc.citation.spage 961 en_US
dc.citation.volume 94 en_US
dc.contributor.authoreid kgarrett en_US
dc.contributor.authoreid rbowden en_US
dc.contributor.authoreid akf en_US
dc.contributor.authoreid bheer en_US

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