Classification of winegrape cultivars in Chile and France according to their susceptibility toBotrytis cinerearelated to fruit maturity

Abstract

Background and Aims The susceptibility of winegrape cultivars to Botrytis cinerea is a debated topic, and the available classifications are based on professional experience rather than on experimental data. The main aim of this study was to compare and classify the susceptibility of several winegrape cultivars to B. cinerea and its relation to fruit maturity under two contrasting climatic and cropping conditions. Methods and Results Between 2011 and 2015, three field trials were undertaken in Chile and France, including 13 common cultivars. Both the incidence and severity of the disease were evaluated at harvest, and indices of susceptibility and maturity were calculated on a per site basis. The significant difference in incidence and severity observed among cultivars led to a similar susceptibility classification in both countries. Cabernet Sauvignon, Cabernet Franc, Grenache Noir and Petit Verdot were the most resistant cultivars, whereas Gewürztraminer and Sauvignon Blanc were the most susceptible. Moreover, an exponential and positive relationship was established between indexes of susceptibility and maturity. Conclusions The classification of cultivars according to the susceptibility to B. cinerea was similar in both countries, despite the contrasting climatic conditions and cropping practices. Significance of the Study These findings might be of interest for choosing cultivars that are more resistant to B. cinerea to reduce the number of fungicide applications.

Effect of Conversion to Organic Farming on Pest and Disease Control in French Vineyards

“…In this context, BBR can also be considered to be a key disease, given that in the German study [44], BBR severity was higher in the biological management systems studied, for example, significant in the biodynamic system. Although we studied a susceptible cultivar [47], the disease severity was mostly low to moderate. Overall, the final severity of the disease was lower than or close to 5% at harvest, which can be considered to be both a quantitative and qualitative threshold [26].…”

The study of hormonal metabolism of Trincadeira and Syrah cultivars indicates new roles of salicylic acid, jasmonates, ABA and IAA during grape ripening and upon infection with Botrytis cinerea

“…2). Though symptoms increase during ripening Syrah still presented at EL38 a lower level of infection than Trincadeira which is not surprising since Syrah is known to be tolerant/ resistant to the disease under normal in-field conditions [33].…”

“…This innovative study focused on the fruit organ since defense mechanisms against fungal pathogens have been documented mostly for vegetative tissues [24]. In the present study, were compared a highly susceptible variety (Trincadeira) that presented heavy symptoms of infection at an early stage of ripening, and a highly resistant/ tolerant variety (Syrah) of grape that was only infected at harvest stage [4,33]. New developmental stages were taken into account allowing deepening the understanding of hormone regulation during grape ripening and grape defense against Botrytis cinerea.…”

Phenolic composition of Tempranillo Blanco (Vitis vinifera L.) grapes and wines after biostimulation via a foliar seaweed application

“…7 White grapevine varieties are more susceptible to fungal diseases than red grapevine varieties. 8 Stilbenes are phytoalexins that are synthetized as glucosides in grapevines, in response to cryptogrammic disease affection. 9,10 Accordingly, resveratrol derivatives can be considered as stress markers.…”