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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

In organic phytosanitary management of vineyards, it is crucial to understand the available pathogen control alternatives in order to progress towards a more sustainable form of viticulture. The objective of this study was to evaluate the efficacy of seven biofungicides registered in Chile for the prevention and treatment of Botrytis Bunch Rot (BBR), and to test a novel fungicide composed of chitosan and riboflavin (CH-RF). Biofungicides including Trichoderma spp., Aureobasidium pullulans, and Melaleuca alternifolia were evaluated using biotests with grapevine berries. Registered products (specifically biological control agents) significantly reduced the in vitro growth of B. cinerea. However, the degree of pathogen control varied significantly among products in grapevine berries of the Chardonnay cultivar, and disease incidence and severity changed depending on the inoculation time. High control effectiveness was achieved with two biofungicides, A. pullulans (average efficacy 34%) and M. alternifolia oil (average efficacy 29%). In vitro tests showed CH-RF significantly reduced mycelial growth of B. cinerea. Noticeable differences between the new CH-RF fungicide (incidence under 50% and infection score under 1) and A. pullulans- and M. alternifolia-based products were detected in grapevine berries. Therefore, the new experimental formulation CH-RF constitutes a promising alternative for the control of B. cinerea and provides a basis for further research.

Details

Title
Biocontrol of Botrytis cinerea on Grape Berries in Chile: Use of Registered Biofungicides and a New Chitosan-Based Fungicide
Author
Herrera-Défaz, Mario 1   VIAFID ORCID Logo  ; Fuentealba, Denis 2   VIAFID ORCID Logo  ; Dibona-Villanueva, Luciano 2 ; Schwantes, Daniel 3   VIAFID ORCID Logo  ; Jiménez, Belén 1 ; Ipinza, Brenda 1 ; Latorre, Bernardo 1 ; Valdés-Gómez, Héctor 1 ; Fermaud, Marc 4   VIAFID ORCID Logo 

 Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; [email protected] (M.H.-D.); [email protected] (B.J.); [email protected] (B.I.); [email protected] (B.L.) 
 Laboratorio de Química Supramolecular y Fotobiología, Departamento de Química Física, Facultad de Química y de Farmacia, Escuela de Química, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; [email protected] (D.F.); [email protected] (L.D.-V.) 
 Departamento de Ciencias Vegetales, Facultad de Agronomía e Ing. Forestal, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; [email protected]; Programa de Farmacología y Toxicología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile; Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile 
 Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement, INRAE, Bordeaux Sciences Agro, l’Institut des Sciences de la Vigne et du Vin, ISVV, 33140 Villenave d’Ornon, France; [email protected] 
First page
746
Publication year
2023
Publication date
2023
Publisher
MDPI AG
e-ISSN
23117524
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2843064103
Copyright
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.