Alternative strategies to sustainably manage grapevine trunk diseases from nursery to vineyard

C. Leal, V. Mondello, O. Fernandez, L. Gérard, P. Reis, C. Rego, C. Pinto, P. Trotel-Aziz, F. Fontaine
Among grapevine declines, trunk diseases (GTDs) are a big threat for global viticulture. Without effective chemicals, other ecofriendly strategies, including biocontrol agents (BCAs) and the use of natural Plant Protection Products (PPPs), are being developed and tested as alternatives to better cope with environmental concerns. At RIBP, we have been evaluating the efficacy of BCAs, and natural products to better manage GTDs under in vitro and in planta conditions using plantlets, cuttings and established vines, respectively. Regarding biocontrol strategies, the efficacy of beneficial fungi (Fusarium proliferatum, Trichoderma atroviride) and beneficial bacteria (Bacillus subtilis PTA-271, Aureobasidium pullulans_Fito278) has been evaluated and described as promising BCAs to sustainably manage GTDs in short-term, through complementary ways of protection also depending on plant metabolism. Therefore, the induced resistance could result from a direct antagonistic effect of BCA on GTD pathogens and/or from indirect induction of plant defenses. Similar ways of protection have also been obtained with innovative PPPs such as LC2017, which combines 3.5% copper with the amphiphilic carrier hydroxyapatite and plant extracts. The main findings of these experiments will be presented to discuss the BCA and PPPs incidence on GTDs, as fungicides or fungistatic, and as elicitors of the plant immune responses.
Leal, C., Mondello, V., Fernandez, O., Gérard, L., Reis, P., Rego, C., Pinto, C., Trotel-Aziz, P. and Fontaine, F. (2023). Alternative strategies to sustainably manage grapevine trunk diseases from nursery to vineyard. Acta Hortic. 1370, 103-120
DOI: 10.17660/ActaHortic.2023.1370.14
biocontrol, natural PPPs, plant immunity, GTDs

Acta Horticulturae