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Additive and synergistic antifungal effects of copper and phenolic extracts from grape cane and apples

Besrukow, Paul; Will, Frank; Dussling, Stefan; Berkelmann-Löhnertz, Beate and Schweiggert, Ralf (2023) Additive and synergistic antifungal effects of copper and phenolic extracts from grape cane and apples. Pest Management Science, 79, pp. 3334-3341.

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Document available online at: https://scijournals.onlinelibrary.wiley.com/doi/full/10.1002/ps.7519


Summary

Background: Organic viticulture seeks sustainable alternatives for eco-toxic copper fungicides to control downy mildew caused by Plasmopara viticola. (Poly)phenol-rich extracts of agricultural byproducts are known to possess antifungal activity, but high production costs often limit their actual implementation.
Results: We developed and produced novel ligninsulfonate-based grape cane extract (GCE) formulations and an apple extract on a pilot plant scale, including a detailed (poly)phenol characterization by high-performance liquid chromatography photodiode array mass spectrometry (HPLC-PDA-MS). Our GCE formulations alone reduced downy mildew disease severity in greenhouse trials by 29%–69% in a dose-dependent manner, whereas a standard application of the copper-based agent alone reached ∼56%. When applied together, disease severity was diminished by 78%–92%, revealing a synergistic effect that depended on the mixture ratio. Combining GCE formulations with the apple extract, additive effects were found (80% disease severity reduction).
Conclusion: The studied plant extracts are proposed to both substitute for and synergistically reinforce copper fungicides in grapevine downy mildew control.


EPrint Type:Journal paper
Keywords:viticulture, downy mildews, 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
viticulture
http://aims.fao.org/aos/agrovoc/c_8277
English
downy mildews
http://aims.fao.org/aos/agrovoc/c_10450
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:10.1002/ps.7519
Related Links:https://www.bundesprogramm.de
Deposited By: Zug, Dr. Katharina
ID Code:55799
Deposited On:05 Jun 2025 12:16
Last Modified:05 Jun 2025 12:16
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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