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| Thuerig, Barbara; Ramseyer, Justine; Hamburger, Matthias; Ludwig, Mathias; Oberhänsli, Thomas; Potterat, Olivier; Schärer, Hans-Jakob; Tamm, Lucius. |
| In organic agriculture, the control of several diseases is largely depending on copper fungicides. Yet, copper can accumulate in the soil if the annual input exceeds annual uptake by plants, which can have a negative impact on soil fertility. Its use should thus be avoided or reduced. The aim of the present study was to evaluate the efficacy of a bark extract of Magnolia officinalis Rehder and Wilson to control three pathogens including Plasmopara viticola (Berk. & M.A. Curtis) Berl. & De Toni (causing grapevine downy mildew), Venturia inaequalis (Cooke) G. Winter (causing apple scab), and Phytophthora infestans (Mont.) De Bary (causing potato and tomato late blight) under controlled and field conditions, and to identify compounds responsible for... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Viticulture. |
| Ano: 2018 |
URL: http://orgprints.org/33740/1/Thuerig-etal-2018_CropProtection_Vol114_p97-105.pdf |
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| Ramseyer, Justine; Thuerig, Barbara; De Mieri, Maria; Schärer, Hans-Jakob; Oberhänsli, Thomas; Gupta, Mahabir P.; Tamm, Lucius; Hamburger, Matthias; Potterat, Olivier. |
| An in-house library of more than 3000 extracts of plant and fungal origin was screened against some major plant pathogens. As one of the hits, an ethyl acetate extract from inflorescences of Verbesina lanata showed significant inhibitory activity in vitro against grapevine downy mildew (Plasmopara viticola), with a MIC100 value of 35 μg/mL. An emulsifiable concentrate formulation with 50 mg/g of the extract was developed for in vivo evaluation. A suspension of the formulation containing 1 mg/mL of extract lowered leaf surface infection of grapevine seedling by 82% compared to the nontreated control. With the aid of HPLC-based activity profiling, the antifungal activity was correlated with a series of lipophilic compounds. Preparative isolation by a... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Viticulture. |
| Ano: 2017 |
URL: http://orgprints.org/33016/1/ramseyer_etal_2017_JNatProd-Vol80_issue12-p3296-3304.pdf |
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| Thuerig, Barbara; Ramseyer, Justine; Hamburger, Matthias; Oberhänsli, Thomas; Potterat, Olivier; Schärer, Hans-Jakob; Tamm, Lucius. |
| BACKGROUNd There is growing demand to replace chemical pesticides with alternatives owing to concerns related to impacts on human health and the environment. Plant-derived plant protection products could provide sustainable and environmentally friendly alternatives to chemical products. The aim of this study was to identify plant and fungal extracts with so far unknown activity against important plant pathogens by in vitro screening of a library of more than 3000 extracts. RESULTS Several plant extracts with promising in vitro fungicidal activity (MIC100 ≤ 50 µg mL−1) towards one or several of the investigated pathogens (Venturia ineaqualis, Phytophthora infestans, Plasmopara viticola) were identified by the screening. One of the hits, an ethyl acetate... |
| Tipo: Journal paper |
Palavras-chave: Fruit and berries Crop health; Quality; Protection Viticulture. |
| Ano: 2016 |
URL: http://orgprints.org/32110/1/Thuerig-etal-2016-Pest%20ManagSci-Vol72-p1718%E2%80%931726.pdf |
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