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Classification of wine grape cultivars in Chile and France according to their susceptibility to Botrytis cinerea related to fruit maturity

Pañitrur-De la Fuente C, Valdés-Gómez H, Roudet J, Acevedo-Opazo C, Verdugo-Vásquez N, Araya-Alman M, Lolas M, Moreno Y, Fermaud M (2018)

Abstract

• Background and Aims:

The susceptibility of wine-grape cultivars (cvs) to Botrytis cinerea is a debated topic, and the available classifications are based on professional experience rather than experimental data. The main aim of this study was to compare and classify the susceptibility of different wine-grape cvs 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 performed in Chile and France, including 13 common cvs. Both the incidence and severity of the disease were evaluated at harvest, and indices of susceptibility (SI) and maturity (FMat) were calculated on a per site basis. The significant differences in incidence and severity observed among cvs led to a similar susceptibility classification in both countries. Cabernet Sauvignon, Cabernet Franc, Grenache Noir and Petit Verdot were the most resistant cvs, whereas Gewürztraminer and Sauvignon Blanc were the most susceptible ones. Moreover, an exponential and positive relationship was established between SI and maturity.

• Conclusions:

The cultivar classification 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 cvs that are more resistant to B. cinerea to reduce the number of fungicide applications.

Keywords

Botrytis bunch rot, Grape maturity, Resistant, Susceptibility Index, Vitis vinifera

Australian Journal of Grape and Wine Research 24 (2) 145-157 DOI: 10.1111/ajgw.12315