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dc.contributor.authorFitt, Bruce D.L.
dc.contributor.authorGregory , P. H.
dc.contributor.authorTodd, A.D.
dc.contributor.authorMcCartney, H. A.
dc.contributor.authorMacdonald, O.C.
dc.date.accessioned2013-07-22T13:32:38Z
dc.date.available2013-07-22T13:32:38Z
dc.date.issued1987-03
dc.identifier.citationFitt , B D L , Gregory , P H , Todd , A D , McCartney , H A & Macdonald , O C 1987 , ' Spore dispersal and plant disease gradients : a comparison between two empirical models ' , Journal of Phytopathology , vol. 118 , no. 3 , pp. 227-242 . https://doi.org/10.1111/j.1439-0434.1987.tb00452.x
dc.identifier.issn1439-0434
dc.identifier.otherPURE: 1420644
dc.identifier.otherPURE UUID: c469d6b9-a74c-4c08-b99f-09685be24d8f
dc.identifier.otherBibtex: urn:c4141dd7b2fdedc56d4af36500fce18d
dc.identifier.otherScopus: 0000714323
dc.identifier.urihttp://hdl.handle.net/2299/11123
dc.description.abstractPower law and exponential models were fitted to 325 sets of observations which described decreases with distance in deposition of air-borne or splash-borne spores, or pollen, or in amounts of plant disease caused by fungi, bacteria or viruses. There, was generally little difference between the models in the goodness of fit to these data, although deposition gradients for spores borne in splash droplets were fitted better by exponential models and gradients for fungi with air-borne spores less than 10 μm in diameter were fitted better by power law models. The exponential model has the property that the observed variable decreases by half as the distance from the source increases by a constant increment (the half-distance); this provides a measureof the gradient that is more easy to visualize than the exponent in power law model. The half-distances of gradients for air-borne pathogens were greater than those for splash-borne or soil-borne pathogens. The exponential model is easier to incorporate into models of disease development than the power law model because the boundary condition at the source (the estimated number of spores or amount of disease at the source) is finite rather than infinite. However, both these empirical models have limitations and should not be extrapolated to distances outside the observed range.en
dc.format.extent16
dc.language.isoeng
dc.relation.ispartofJournal of Phytopathology
dc.titleSpore dispersal and plant disease gradients : a comparison between two empirical modelsen
dc.contributor.institutionDepartment of Human and Environmental Sciences
dc.contributor.institutionGeography, Environment and Agriculture
dc.contributor.institutionCrop and Environmental Protection
dc.contributor.institutionSchool of Life and Medical Sciences
dc.contributor.institutionHealth & Human Sciences Research Institute
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Life and Medical Sciences
dcterms.dateAccepted1987-03
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1439-0434.1987.tb00452.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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