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Incomplete cross-resistance to folpet and iprodione in botrytis cinerea from grapevine in South Africa

dc.contributor.authorFourie, P. H.en_ZA
dc.contributor.authorHolz, G.en_ZA
dc.date.accessioned2017-06-02T08:11:10Z
dc.date.available2017-06-02T08:11:10Z
dc.date.issued2001
dc.identifier.citationFourie, P. H. & Holz, G. 2001. Incomplete cross-resistance to folpet and iprodione in botrytis cinerea from grapevine in South Africa. South African Journal of Enology & Viticulture, 22(1):3-7, doi:10.21548/22-1-2158en_ZA
dc.identifier.issn2224-7904 (online)
dc.identifier.issn0253-939X (print)
dc.identifier.otherdoi:10.21548/22-1-2158
dc.identifier.urihttp://hdl.handle.net/10019.1/101689
dc.descriptionCITATION: Fourie, P. H. & Holz, G. 2001. Incomplete cross-resistance to folpet and iprodione in botrytis cinerea from grapevine in South Africa. South African Journal of Enology & Viticulture, 22(1):3-7, doi:10.21548/22-1-2158.en_ZA
dc.descriptionThe original publication is available at http://www.journals.ac.za/index.php/sajeven_ZA
dc.description.abstractThe sensitivity to folpet of Botrytis cinerea isolates obtained from table grape vineyards in the Western Cape province of South Africa with a known history of dicarboximide (DC) resistance and high-schedule DC and folpet programmes was investigated. In the Simondium vineyards, 61 % of the B. cinerea isolates from Dan-hen-Hannah and 20% of the isolates from Waltham Cross were resistant to iprodione. In the Northern Paarl vineyards, 95% of the isolates from Dan-hen-Hannah and 95% of the isolates from Waltham Cross were designated resistant. In the case of the iprodione-sensitive isolates from vineyards in Simondium, folpet ECso values ranged from 4.9 to 29.1 μg/mL for the Dan-hen-Hannah and 15.0 to 43.5 μg/mL for the Waltham Cross sub-populations, respectively. Folpet ECso values of the iprodione-resistant isolates, on the other hand, ranged from 19.7 to above 100 μg/mL for the Dan-hen-Hannah subpopulation. In the Northern Paarl subpopulations, where the isolates were predominantly iprodione-resistant, folpet ECso values of the latter isolates ranged from 21.5 to above 100 μg/mL. Similar shifts in folpet sensitivity were displayed by ultra-low- and low-level DC-resistant B. cinerea isolates obtained from other regional subpopulations. The results indicated incomplete cross-resistance between iprodione and folpet. This finding suggests that early increases in DC resistance frequencies in B. cinerea, observed prior to DC application in vineyards under the high-schedule DC and folpet programmes, can be attributed to incomplete cross-resistance to these fungicides in sub-populations of the pathogen.en_ZA
dc.description.urihttp://www.journals.ac.za/index.php/sajev/article/view/2158
dc.format.extent5 pagesen_ZA
dc.language.isoen_ZAen_ZA
dc.publisherSouth African Society for Enology and Viticultureen_ZA
dc.subjectGrapes -- Diseases and pestsen_ZA
dc.subjectResistance of Botrytis cinerea to fungicideen_ZA
dc.subjectTable grape vineyards -- South Africa -- Western Capeen_ZA
dc.titleIncomplete cross-resistance to folpet and iprodione in botrytis cinerea from grapevine in South Africaen_ZA
dc.typeArticleen_ZA
dc.description.versionPublisher's versionen_ZA
dc.rights.holderSouth African Society for Enology and Viticultureen_ZA


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