In vitro screening of fungicides against phomopsis viticola and diaporthe perjuncta

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dc.contributor.authorMostert, L.en_ZA
dc.contributor.authorDenman, S.en_ZA
dc.contributor.authorCrous, P. W.en_ZA
dc.date.accessioned2017-06-02T09:36:12Z
dc.date.available2017-06-02T09:36:12Z
dc.date.issued2000
dc.descriptionCITATION: Mostert, L., Denman, S. & Crous, P. W. 2000. In vitro screening of fungicides against phomopsis viticola and diaporthe perjuncta. South African Journal of Enology & Viticulture, 21(2):62-65, doi:10.21548/21-2-2210.en_ZA
dc.descriptionThe original publication is available at http://www.journals.ac.za/index.php/sajeven_ZA
dc.description.abstractPhomopsis viticola is the cause of Phomopsis cane and leaf spot disease of grapevines, while Diaporthe perjuncta is associated with bud mortality. The efficacy of nine fungicides (azoxystrobin, flusilazole, folpet, fosetyl-Al + mancozeb, kresoxim-methyl, mancozeb, penconazole, spiroxamine and trifloxystrobin) against isolates of P. viticola and D. perjuncta was determined in vitro using the mycelial growth test. Additionally, azoxystrobin, folpet, kresoxim-methyl, mancozeb, propineb and trifloxystrobin were tested for their ability to inhibit spore germination in vitro. Ten isolates of P. viticola and three of D. perjuncta were used in the mycelium inhibition tests, and five isolates of P. viticola in the spore germination tests. The effective concentration at which mycelial growth was inhibited by 50% and at which 50% of the spores (EC50 value) were inhibited from germinating was calculated for each isolate/fungicide combination. In the mycelium growth test flusilazole, penconazole and trifloxystrobin gave better inhibition at lower concentrations than folpet and fosetyl-Al + mancozeb. No significant differences in the mean ECso values were detected among azoxystrobin, flusilazole, kresoxim-methyl, penconazole, spiroxamine and trifloxystrobin. There were also no significant differences among the mean EC50 values of azoxystrobin, kresoximmethyl and mancozeb. Flusilazole and penconazole inhibited mycelial growth at the lowest mean EC50 values obtained. Kresoxim-methyl and trifloxystrobin inhibited spore germination at lower concentrations than folpet or mancozeb. Folpet required the highest concentration to inhibit 50% germination and was significantly different from mancozeb and propineb. There were also no significant differences among the mean EC50 values of mancozeb, propineb and azoxystrobin. The mean EC50 values of the strobilurin fungicides were not significantly different from one another. These results indicate that the strobilurin fungicides inhibited mycelial growth and spore germination of P. viticola. Trials need to be conducted to verify these findings under field conditions.en_ZA
dc.description.urihttp://www.journals.ac.za/index.php/sajev/article/view/2210
dc.description.versionPublisher's versionen_ZA
dc.format.extent4 pagesen_ZA
dc.identifier.citationMostert, L., Denman, S. & Crous, P. W. 2000. In vitro screening of fungicides against phomopsis viticola and diaporthe perjuncta. South African Journal of Enology & Viticulture, 21(2):62-65, doi:10.21548/21-2-2210en_ZA
dc.identifier.issn2224-7904 (online)
dc.identifier.issn0253-939X (print)
dc.identifier.otherdoi:10.21548/21-2-2210
dc.identifier.urihttp://hdl.handle.net/10019.1/101700
dc.language.isoen_ZAen_ZA
dc.publisherSouth African Society for Enology and Viticultureen_ZA
dc.rights.holderSouth African Society for Enology and Viticultureen_ZA
dc.subjectGrapevines -- Diseases and pests -- Controlen_ZA
dc.subjectGrapevine disease controlen_ZA
dc.subjectPhomopsis viticolaen_ZA
dc.subjectDiaporthe perjunctaen_ZA
dc.subjectFungicide sensitivityen_ZA
dc.subjectFungicides -- Applicationen_ZA
dc.titleIn vitro screening of fungicides against phomopsis viticola and diaporthe perjunctaen_ZA
dc.typeArticleen_ZA
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