Effects of planting density and the composition of wheat cultivar mixtures on stripe rust: an analysis taking into account limits to the replication of controls

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dc.contributor.author Mundt, C. C.
dc.contributor.author Garrett, Karen A.
dc.date.accessioned 2012-06-04T18:04:31Z
dc.date.available 2012-06-04T18:04:31Z
dc.date.issued 2012-06-04
dc.identifier.uri http://hdl.handle.net/2097/13898
dc.description.abstract The effect of plant density on disease is not well understood in populations of a single host plant genotype and has been studied even less in mixtures of host genotypes. We performed an experiment to evaluate the effect of wheat planting density on infection by Puccinia striiformis in experimental plots with a single wheat genotype and in plots with two genotypes making up a range of frequencies. Stripe rust severity in single-genotype plots increased with planting density in 1997 but decreased with planting density in 1998. Disease in host mixtures was compared to the weighted mean of disease levels in the corresponding single-genotype plots. The design of the field experiment included limited replication of these reference treatments (that is, there was not a unique pair of single-genotype plots for each mixture plot); therefore, we devised an analysis based on collapsing the data into independent mean observations. Disease reduction due to host diversity was less when one genotype predominated than when both host genotypes were present at nearly equal frequencies. The greatest mean host-diversity effect for reduced disease was at the intermediate planting density of 250 seeds per m2. en_US
dc.relation.uri http://apsjournals.apsnet.org/doi/abs/10.1094/PHYTO.2000.90.12.1313 en_US
dc.subject Planting density en_US
dc.subject Wheat cultivar mixtures en_US
dc.subject Stripe rust en_US
dc.subject Cultivar mixtures en_US
dc.subject Mixture analysis en_US
dc.subject Mixture models en_US
dc.subject Triticum aestivum en_US
dc.title Effects of planting density and the composition of wheat cultivar mixtures on stripe rust: an analysis taking into account limits to the replication of controls en_US
dc.type Article (publisher version) en_US
dc.date.published 2000 en_US
dc.citation.doi doi:10.1094/PHYTO.2000.90.12.1313 en_US
dc.citation.epage 1321 en_US
dc.citation.issue 12 en_US
dc.citation.jtitle Phytopathology en_US
dc.citation.spage 1313 en_US
dc.citation.volume 90 en_US
dc.contributor.authoreid kgarrett en_US

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