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Efficacy of extracts from eight economically important forestry species against grapevine downy mildew (Plasmopara viticola) and identification of active constituents

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 and Schärer, Hans-Jakob (2017) Efficacy of extracts from eight economically important forestry species against grapevine downy mildew (Plasmopara viticola) and identification of active constituents. Crop Protection, 102, pp. 104-109.

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Online at: http://www.sciencedirect.com/science/article/pii/S0261219417302491


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 larixyl acetate or 7a,15-dihydroxydehydroabietic acid are present in significant amounts in Larix or P. sylvestris bark extracts, respectively.
The identified active compounds are gained from a renewable resource potentially available in large quantities at relatively low prices, making them interesting candidates for the development of a plantderived fungicide active against a key pathogen in agriculture, providing an opportunity to the forest industry to transform low value by-products into high value-added, bioactive extracts.

EPrint Type:Journal paper
Keywords:Fungicide, Plasmopara viticola, Larix, Pinus sylvestris, Larixol, Larixyl acetate, Department of Crop Sciences, Crop Protection
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries > Viticulture
Research affiliation:Other countries
Finland > Univ. Helsinki
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Plant Protection and Biodiversity
UK > Other organizations
Deposited By: Thürig, Dr. Barbara
ID Code:32106
Deposited On:12 Sep 2017 11:15
Last Modified:12 Sep 2017 11:16
Document Language:English
Refereed:Peer-reviewed and accepted

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