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dc.contributor.authorZhou, Y.
dc.contributor.authorFitt, Bruce D.L.
dc.contributor.authorWelham, S.J.
dc.contributor.authorEvans, N.
dc.contributor.authorGladders, P.
dc.date.accessioned2013-06-19T09:00:46Z
dc.date.available2013-06-19T09:00:46Z
dc.date.issued2000-08
dc.identifier.citationZhou , Y , Fitt , B D L , Welham , S J , Evans , N & Gladders , P 2000 , ' Effects of stem canker (Leptosphaeria maculans) and light leaf spot (Pyrenopeziza brassicae) on yield of winter oilseed rape (Brassica napus) in southern England ' , Plant Pathology , vol. 49 , no. 4 , pp. 487-497 . https://doi.org/10.1046/j.1365-3059.2000.00475.x
dc.identifier.issn1365-3059
dc.identifier.otherPURE: 1403173
dc.identifier.otherPURE UUID: d64f22c1-0f2d-4f7a-848e-458cef6702ef
dc.identifier.otherBibtex: urn:29f8ad0c381d090c3c23f6162ada7c79
dc.identifier.otherScopus: 0033854759
dc.identifier.urihttp://hdl.handle.net/2299/10859
dc.description.abstractThe relationships between yield loss and incidence or severity of stem canker and light leaf spot in winter oilseed rape were analysed by correlation and regression analyses, using data from experiments at Rothamsted, England in 1992/93, 1994/95 and 1995/96. Growth stages (GS) 6,3/6,4 and 4,0/4,5 were identified as the critical points for relating percentage yield loss to stem canker and light leaf spot (on stems), respectively. Critical point (CP) and area under disease progress curve (AUDPC) models relating percentage yield loss to combined incidence or severity of stem canker and light leaf spot (stems) in each experiment were constructed by linear regression. There were no differences in the CP models for incidence between 1992/93, 1994/95 and 1995/96 experiments, or in the AUDPC models for incidence between 1992/93 and 1994/95 experiments. Therefore, a general CP model relating percentage yield loss (Delta Y) to combined incidence of stem canker (S-i) at GS 6,3/6,4 and light leaf spot (stems) (L-i) at GS 4,0/4,5 was constructed using data from the three experiments: Delta Y = 0.85 + 0.079S(i) + 0.065L(i) (R-2 = 43.7%, P < 0.001, 92 df). A general AUDPC model relating Delta Y to the AUDPC of combined incidence of stem canker (S-ia) from GS 5.7 to GS 6.5 and light leaf spot (stems) (L-ia) from GS 4.0 to GS 6.3 was constructed using data from the 1992/93 and 1994/95 experiments: Delta Y = 0.07 + 0.00096S(ia) + 0.0026L(ia) (R-2 = 43.6%, P < 0.001, 68 df). These two general yield-loss models were tested with data from Rothamsted in 1993/94 and Boxworth in 1992/93. The predictive accuracy of the CP model based on combined incidence of stem canker and light leaf spot (stems) was better than that of the AUDPC model. Yield losses predicted by summing the estimates from individual models for incidence of stem canker alone (GS 6,3/6,4) and light leaf spot alone (on leaves at GS 3,3) were greater than observed yield losses in experiments at Rothamsted in 1992/93, 1993/94, 1994/95 and 1995/96 and at Boxworth in 1992/93.en
dc.format.extent11
dc.language.isoeng
dc.relation.ispartofPlant Pathology
dc.subjectcombined yield loss
dc.subjectLeptosphaeria maculans
dc.subjectlight leaf spot
dc.subjectPyrenopeziza brassicae
dc.subjectstem canker
dc.subjectwinter oilseed rape
dc.titleEffects of stem canker (Leptosphaeria maculans) and light leaf spot (Pyrenopeziza brassicae) on yield of winter oilseed rape (Brassica napus) in southern Englanden
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.dateAccepted2000-08
rioxxterms.versionofrecordhttps://doi.org/10.1046/j.1365-3059.2000.00475.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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