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Efficacy of extracts from eight economically important forestry species against grapevine downy mildew (Plasmopara viticola) and identification of active constituents Organic Eprints
Mulholland, Dulcie A.; Thürig, Barbara; Langat, Moses K.; Tamm, Lucius; Nawrot, Dorota A.; James, Emily E.; Qayyum, Meywish; Shen, Danni; Ennis, Kallie; Jones, Amy; Hokkanen, Heikki; Demidova, Natalie; Izotov, Denis; Schärer, Hans-Jakob.
Downy mildew caused by the oomycete Plasmopara viticola is the most devastating pathogen of grapevine. In this study, extracts of the bark of eight important northern forestry species were screened to find extracts showing activity against this pathogen and to identify the active compounds. Extracts from all eight species showed activity against P. viticola, the most promising, dichloromethane extracts of three Larix species, almost completely protecting grapevine from downy mildew under semi-controlled conditions. Five promising lead compounds were isolated: larixol, larixyl acetate, lariciresinol and lariciresinol acetate from Larix species and 7a,15-dihydroxydehydroabietic acid from Pinus sylvestris. These compounds showed 90%e100% efficacy. Larixol and...
Tipo: Journal paper Palavras-chave: Crop health; Quality; Protection Viticulture.
Ano: 2017 URL: http://orgprints.org/32106/1/Mulholland-etal-2017-CropProtection-Vol102-p104-109.pdf
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Reducing copper use in the environment: the use of larixol and larixyl acetate to treat downymildew caused by Plasmopara viticola in viticulture Organic Eprints
Thuerig, Barbara; James, Emily E.; Schärer, Hans-Jakob; Langat, Moses K.; Mulholland, Dulcie A.; Treutwein, Jonas; Kleeberg, Ina; Ludwig, Mathias; Jayarajah, Praveen; Giovannini, Oscar; Markellou, Emilia; Tamm, Lucius.
BACKGROUND: Plant extracts might provide sustainable alternatives to copper fungicides, which are still widely used despite their unfavourable ecotoxicological profile. Larch bark extract and its constituents, larixyl acetate and larixol, have been shown to be effective against grapevine downy mildew (Plasmopara viticola) under semi-controlled conditions. The aim of this study was to reduce the gap between innovation and the registration of amarketable product, namely to develop scalable extraction processes and to evaluate and optimise the performance of larch extracts under different conditions. RESULTS: Toxicologically and technically acceptable solvents like ethanol were used to extract the active compounds larixyl acetate and larixol from bark in...
Tipo: Journal paper Palavras-chave: Crop health; Quality; Protection Viticulture.
Ano: 2018 URL: http://orgprints.org/33739/1/Thuerig-etal-etal_2017-PestManagementScience_Vol74_issue2_p477-488.pdf
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