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Efficacy of using grape cane extracts against Plasmopara viticola under field conditions and their impact on the composition of berries and musts of Vitis vinifera L. cv. Riesling

Besrukow, Paul; Will, Frank; Berkelmann-Löhnertz, Beate; Stoll, Manfred and Schweiggert, Ralf (2024) Efficacy of using grape cane extracts against Plasmopara viticola under field conditions and their impact on the composition of berries and musts of Vitis vinifera L. cv. Riesling. OENO One, 58 (4), pp. 1-13.

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Document available online at: https://oeno-one.eu/article/view/8037


Summary

Grapevine downy mildew caused by Plasmopara viticola is a deleterious vine disease currently controlled using synthetic and copper-based fungicides. Environmental concerns surrounding such fungicides necessitate sustainable alternatives like grape cane extracts. However, studies into their efficacy and effects on the product remain limited. This study aimed to assess the open-field efficacy of a novel grape cane extract formulation, alone and combined with a copper agent, against downy mildew, and to examine its impact on berry and must composition. The results were compared to standard fungicides frequently used in integrated and organic viticulture. In 2022, the grape cane extract formulation reduced downy mildew severity by 78 % on berry clusters, comparable to the maximum acceptable dose of copper for organic farming in Germany (3 kg/ha/a). Combining the grape cane extract with the copper agent was more effective than the copper agent alone, but not more effective than the grape cane extract alone. In 2023, disease development was marginal, despite artificial inoculation. Compositional differences detectable by FTIR were insignificant between musts derived from all treatments, increased copper levels were observed whenever copper had been applied. The phenolic content in freeze-dried, de-seeded berries of 2022 was significantly lower after copper (14.6 mg/g dry weight DW) and grape cane extract treatments (6.6 mg/g DW) when compared to the control (36.1 mg/g DW), with discrepancies in stilbenoid and flavan-3-ol levels in particular, as analysed by HPLC-DAD. However, these differences were not confirmed in 2023, with results showing no correlations between different treatments and phenolic contents. These findings suggest that applications of the phenolic grape cane extract do not lead to artificially altered levels or relevant residues of the active constituents; i.e., the phenolic compounds in the product. In brief, grape cane extracts might represent a promising natural alternative to controlling grapevine downy mildew, particularly in organic viticulture, which, to date, heavily relies on (eco-)toxic copper-pesticides. Further multi-year studies including wine analyses are warranted to follow the entire flow towards the final product.


EPrint Type:Journal paper
Keywords:grape must, Plasmopara viticola, Vitis vinifera, BÖL, BOEL, FKZ 18OE004, FKZ 18OE033, FKZ 18OE034, FKZ 18OE034, FKZ 18OE035, FKZ 18OE036, FKZ 18OE037, FKZ 18OE038, FKZ 18OE112, FKZ 18OE113, FKZ 18OE114, FKZ 18OE115, VITIFIT, Plasmopara, viticola, Weinbau, Praxisforschungsnetzwerk
Agrovoc keywords:
Language
Value
URI
English
grape must
http://aims.fao.org/aos/agrovoc/c_28472
English
Plasmopara viticola
http://aims.fao.org/aos/agrovoc/c_34557
English
Vitis vinifera
http://aims.fao.org/aos/agrovoc/c_8283
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries > Viticulture
Research affiliation: Germany > Federal Organic Farming Scheme - BOEL > Plants > Pflanzenschutz
Germany > Hochschule Geisenheim University
DOI:10.20870/oeno-one.2024.58.4.8037
Related Links:https://www.bundesprogramm.de
Deposited By: Zug, Dr. Katharina
ID Code:55800
Deposited On:05 Jun 2025 12:24
Last Modified:05 Jun 2025 12:24
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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