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dc.contributor.authorBiddulph, J.E.
dc.contributor.authorFitt, Bruce D.L.
dc.contributor.authorLeech, P.K.
dc.contributor.authorWelham, S.J.
dc.contributor.authorGladders, P.
dc.date.accessioned2013-08-21T08:15:01Z
dc.date.available2013-08-21T08:15:01Z
dc.date.issued1999-11
dc.identifier.citationBiddulph , J E , Fitt , B D L , Leech , P K , Welham , S J & Gladders , P 1999 , ' Effects of temperature and wetness duration on infection of oilseed rape leaves by ascospores of Leptosphaeria maculans (stem canker) ' , European Journal of Plant Pathology , vol. 105 , no. 8 , pp. 769-781 . https://doi.org/10.1023/A:1008727530088
dc.identifier.issn1573-8469
dc.identifier.otherPURE: 1404663
dc.identifier.otherPURE UUID: 6a15eac9-c8dd-4911-bd75-2e0f276560d6
dc.identifier.otherBibtex: urn:9408d42033ee4dc12c954a3942d94b44
dc.identifier.otherScopus: 0033381505
dc.identifier.urihttp://hdl.handle.net/2299/11401
dc.description.abstractIn controlled environment experiments, ascospores of Leptosphaeria maculans (stem canker) infected oilseed rape (cv. Nickel) leaves and caused phoma leaf spots at temperatures from 8 degrees C to 24 degrees C and leaf wetness durations from 8 h to 72 h. The conditions that produced the greatest numbers of leaf spot lesions were a leaf wetness duration of 48 h at 20 degrees C; numbers of lesions decreased with decreasing leaf wetness duration and increasing or decreasing temperature. At 20 degrees C with 48 h of leaf wetness, it was estimated that one out of four spores infected leaves to cause a lesion whereas with 8 h of leaf wetness only one out of 300 spores caused a lesion. As temperature increased from 8 degrees C to 20 degrees C, the time from inoculation to the appearance of the first lesions (a measure of the incubation period) decreased from 15 to 5 days but leaf wetness duration affected the length of the incubation period only at sub-optimal temperatures. Analyses suggested that, within the optimal ranges, there was little effect of temperature or wetness duration on incubation period expressed as degree-days; the time until appearance of 50% of the lesions was ca. 145 degree-days. A linear regression of % leaves with lesions (P-l) (square-root transformed) on % plants with lesions (P-p) accounted for 93% of the variance: root P-l=1.31+0.061P(p). This relationship was also investigated in winter oilseed rape field experiments in unsprayed plots from October to April in 1995/96 (cv. Envol), 1996/97 (cv. Envol), 1997/98 (cvs Bristol and Capitol) and 1998/99 (cvs Apex, Bristol and Capitol) seasons. The linear regression of % leaves with lesions (square-root transformed) on % plants with lesions accounted for 90% of the variance and had a similar slope to the controlled environment relationship: root P-l=0.81+0.051P(p). These results were used to examine relationships between the development of phoma leaf spot on plants in winter oilseed rape crops, the incubation period of L. maculans and the occurrence of infection criteria (temperature, rainfall) in the autumns of 1996, 1997 and 1998.en
dc.format.extent13
dc.language.isoeng
dc.relation.ispartofEuropean Journal of Plant Pathology
dc.rightsOpen
dc.subjectincubation period
dc.subjectinfection conditions
dc.subjectphoma leaf spot
dc.subjectwinter oilseed rape
dc.titleEffects of temperature and wetness duration on infection of oilseed rape leaves by ascospores of Leptosphaeria maculans (stem canker)en
dc.contributor.institutionSchool of Life and Medical Sciences
dc.contributor.institutionDepartment of Human and Environmental Sciences
dc.contributor.institutionHealth & Human Sciences Research Institute
dc.contributor.institutionAgriculture, Veterinary and Food Sciences
dc.contributor.institutionGeography, Environment and Agriculture
dc.contributor.institutionCrop and Environmental Protection
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Life and Medical Sciences
dc.description.versiontypeFinal Published version
dcterms.dateAccepted1999-11
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1023/A:1008727530088
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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