Efficacy of a Magnolia officinalis bark extract against grapevine downy mildew and apple scab under controlled and field conditions

Thuerig, Barbara; Ramseyer, Justine; Hamburger, Matthias; Ludwig, Mathias; Oberhänsli, Thomas; Potterat, Olivier; Schärer, Hans-Jakob; Tamm, Lucius

doi:10.1016/j.cropro.2018.08.011

Cited by 19 publications

(13 citation statements)

References 41 publications

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“…In studies on leaf discs, extracts of Artemisia absinthium, Artemisia vulgaris, Achillea millefolium, Betula pendula, Calendula officinalis, Cannabis sativa, Chloris virgata, Daucus carota, Dalbergia hupeana, Dryopteris filix-mas, Frangula alnus, Glycyrrhiza glabra, Hibiscus trionum, Hypericum perforatum, Hyssopus officinalis, Magnolia officinalis, Origanum vulgare, Paeonia suffruticosa, Pastinaca sativa, Petasites albus, Picea abies, Pinus massoniana, Pinus pinaster, Rheum palmatum, Robinia pseudoacacia, Salix alba, Salvia officinalis, Symphytum officinale, Solidago canadensis, Tanacetum vulgare, Trigonella foenum-graecum , and Traxacum officinalae showed high inhibitory effect on sporangia germination (Kast, 2001 ; Chen et al, 2002 ; Godard et al, 2009 ; Harm et al, 2011 ; Tröster, 2016 ; Gabaston et al, 2017a , b ; Andreu et al, 2018 ; James, 2018 ; Thuerig et al, 2018b ).…”

Section: Disease Managementmentioning

confidence: 99%

Plasmopara viticola the Causal Agent of Downy Mildew of Grapevine: From Its Taxonomy to Disease Management

et al. 2022

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Plasmopara viticola (P. viticola, Berk. & M. A. Curtis; Berl. & De Toni) causing grapevine downy mildew is one of the most damaging pathogens to viticulture worldwide. Since its recognition in the middle of nineteenth century, this disease has spread from America to Europe and then to all grapevine-growing countries, leading to significant economic losses due to the lack of efficient disease control. In 1885 copper was found to suppress many pathogens, and is still the most effective way to control downy mildews. During the twentieth century, contact and penetrating single-site fungicides have been developed for use against plant pathogens including downy mildews, but wide application has led to the appearance of pathogenic strains resistant to these treatments. Additionally, due to the negative environmental impact of chemical pesticides, the European Union restricted their use, triggering a rush to develop alternative tools such as resistant cultivars breeding, creation of new active ingredients, search for natural products and biocontrol agents that can be applied alone or in combination to kill the pathogen or mitigate its effect. This review summarizes data about the history, distribution, epidemiology, taxonomy, morphology, reproduction and infection mechanisms, symptoms, host-pathogen interactions, host resistance and control of the P. viticola, with a focus on sustainable methods, especially the use of biocontrol agents.

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Section: Disease Managementmentioning

confidence: 99%

Plasmopara viticola the Causal Agent of Downy Mildew of Grapevine: From Its Taxonomy to Disease Management

et al. 2022

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“…Especially the low efficacies of the bark extracts at 800 µg/mL were unexpected, because in the preliminary tests 500 µg/mL WBD could effectively suppress DM infection on leaf discs and seedlings for up to 48 h. Basically, discrepancies in inhibition efficacy between controlled and field conditions are well known and might be due to several factors. Bark extract of M. officinalis, for instance, showed efficacy of 97% when used on grapevine seedlings under controlled conditions [29], while under field conditions the extract reached only 26% efficacy. Furthermore, Dagostin and colleagues [24] reported an efficacy between 79.9% and 95.8% for S. officinalis extracts when treating seedlings in the greenhouse.…”

Section: Discussionmentioning

confidence: 99%

“…In a leaf disc bioassay, extracts based on Pinus pinaster knot at 500 µg/mL could fully suppress DM infection [55]. Using Juncus effusus medulla extract and Magnolia officinalis bark extracts, Thuering and colleagues [26,29] could reduce DM infection on grapevine seedlings with an efficacy of >90% (256 µg/mL) and 97% (1000 µg/mL), respectively. In general, extracts made of tree bark seem to be highly effective against DM.…”

Section: Discussionmentioning

confidence: 99%

“…The interest in botanicals, not only as pesticides in agriculture but also as pharmaceuticals, massively increased in the last decades mostly due to public concerns regarding off-target effects by synthetic pesticides/drugs [20][21][22][23]. Also in viticulture, several plant extracts were evaluated regarding their efficacy against DM, with promising results: Salvia officinalis [24], Vitis vinifera [25], Juncus effusus [26], Larix decidua [27], Verbesina lanata [28], Magnolia officinalis [29], Yucca schidigera, Glycyrrhiza glabra [30]. However, despite strong efforts, so far, no PPP based on plant extracts could fulfill all criteria for a highly effective fungicide against DM in viticulture.…”

Section: Introductionmentioning

confidence: 99%

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Warburgia ugandensis Leaf and Bark Extracts: An Alternative to Copper as Fungicide against Downy Mildew in Organic Viticulture?

Kraus

Abou-Ammar

Schubert

et al. 2021

Plants

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In organic viticulture, copper-based fungicides are commonly used to suppress Downy Mildew infection, caused by the oomycete Plasmopara viticola. However, the frequent and intensive use of such fungicides leads to accumulation of the heavy metal in soil and nearby waters with adverse effects on the ecosystem. Therefore, alternative, organic fungicides against Downy Mildew are urgently needed to reduce the copper load in vineyards. In this study, the use of Warburgia ugandensis Sprague (Family Canellacea) leaf and bark extracts as potential fungicides against Downy Mildew were evaluated. In vitro (microtiter) and in vivo (leaf discs, seedlings) tests were conducted, as well as field trials to determine the efficacy of the extracts against Downy Mildew. The results revealed an MIC100 of 500 µg/mL for the leaf extract and 5 µg/mL for the bark extract. Furthermore, experiments with leaf discs and seedlings demonstrated a strong protective effect of the extracts for up to 48 h under (semi-) controlled conditions. However, in field trials the efficacy of the extracts distinctly declined, regardless of the extracts’ origin and concentration.

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“…9,10 We recently found that Sumatra benzoin and its major constituent, p-coumaryl cinnamate, may have a potential to be developed as an agricultural fungicide. 11 Several phytochemical investigations have been performed on Sumatra benzoin. They include gas chromatography (GC) analysis of volatile constituents, 12,13 the detection and quantification of phenolic constituents by highperformance liquid chromatography with ultraviolet-evaporative light scattering detection (HPLC-UV-ELSD) analysis, 8 the analysis of triterpenoids and benzyl and cinnamyl esters by HPLC coupled with photodiode array detection and fluorimetry (HPLC-PDA-fluorimetry), 14 and the analysis of free and ester bound benzoic and cinnamic acids by GC−MS and HPLC−frit-fast atom bombardment−MS (HPLC−frit FAB−MS).…”

Section: ■ Introductionmentioning

confidence: 99%

Qualitative and Quantitative Secondary Metabolite Profiles in a Large Set of Sumatra Benzoin Samples

Heng

Syafni

Ramseyer

et al. 2023

J. Agric. Food Chem.

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Sumatra benzoin, a resin produced by Styrax benzoin and Styrax paralleloneurum, is used as an aromatic agent and may have the potential to be developed as a new agricultural fungicide. In this context, we performed a comprehensive metabolite profiling of a commercial grade A resin by high-performance liquid chromatography coupled with photodiode array detection, evaporative light scattering detection, and mass spectrometry (HPLC-PDA-ELSD-MS) analysis in combination with 1 H NMR. Thirteen compounds including a new cinnamic acid ester containing two p-coumaroyl residues were identified after preparative isolation. These compounds accounted for an estimated 90% of the crude resin according to 1 H NMR analysis. The two major constituents, p-coumaryl cinnamate (5) and sumaresinolic acid (11), were quantified by HPLC analysis. In a next step, the chemical profiles and the content in p-coumaryl cinnamate were compared in a large set of resin samples of different quality grades that were obtained from various commercial suppliers in Sumatra. The qualitative profiles of the samples were very similar, but significant quantitative differences were observed between different quality grades and origins of the samples for the relative contents.

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Efficacy of a Magnolia officinalis bark extract against grapevine downy mildew and apple scab under controlled and field conditions

Cited by 19 publications

References 41 publications

Plasmopara viticola the Causal Agent of Downy Mildew of Grapevine: From Its Taxonomy to Disease Management

Plasmopara viticola the Causal Agent of Downy Mildew of Grapevine: From Its Taxonomy to Disease Management

Warburgia ugandensis Leaf and Bark Extracts: An Alternative to Copper as Fungicide against Downy Mildew in Organic Viticulture?

Qualitative and Quantitative Secondary Metabolite Profiles in a Large Set of Sumatra Benzoin Samples

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