terclim by ICS banner
IVES 9 IVES Conference Series 9 Response to powdery and downy mildew of varieties with disease resistance genes (PIWI)

Response to powdery and downy mildew of varieties with disease resistance genes (PIWI)

Abstract

Erysiphe necator and Plasmopara viticola are the causal agents of powdery and downy mildew on grapevines, leading to significant economic losses. Numerous chemical treatments are applied to control these diseases, leading to environmental problems and the appearance of resistance to these products. Therefore, the study of new strategies to achieve the objectives of sustainable development is a priority. In this sense, the use of new varieties resistant to these diseases may be an option of interest. The objective of this work was to analyze the degree of resistance of 9 varieties with downy mildew resistance genes (Rpv3 and/or Rpv12), four of which also carry a powdery mildew resistance gene (Ren 1) by in vitro inoculation assays. Young leaves previously sterilized were inoculated with a vacuum tower. Fungal development was evaluated on a scale from 1 to 5, seven and 14 days after inoculation. At 7 days, mycelium growth, without development of conidiophores, was observed in all varieties, with Eidos having the highest incidence. At 14 days, none of the varieties reached a scale of 4, except Mazuelo (used as standard). The highest incidence was recorded in the Volos variety. Preliminary trials on downy mildew also showed differences in resistance to attack by P. viticola, with Kretos having the highest incidence of the disease, but further trials will be conducted to validate these data. These results reveal that these varieties may be an alternative in order to reduce the number of spray applications to control the fungus.

 

Acknowledgments: This work has been funded by the Government of La Rioja, (Fortalece 2021/08). Support from the staff at CIDA and the Plant Resources service of the ICVV is gratefully acknowledged.

Download the abstract

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster

Authors

M. Mar Hernández*, Sara I. Blanco–González, Cristina M. Menéndez

Instituto de Ciencias de la Vid y el Vino (ICVV (UR-GR-CSIC)), Finca La Grajera, Carretera de Burgos km 6, 26007, Logroño, La Rioja, Spain

Contact the author*

Keywords

PIWI, powdery mildew, downey mildew, sustainable viticulture, resistant varieties

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

MODELLING THE AGEING POTENTIAL OF SYRAH RED WINES BY ACCELERATED AGEING TESTS: INFLUENCE OF ANTIOXIDANT ASSAYS AND PHENOLIC COMPOSITION

Red wine ageing is an important step in the red wine evolution and impacts its chemical and sensory characteristics through many chemicals and physico-chemical reactions. The kinetics of these evolutions depend on the wine studied and influence the wine ageing potential. Generally, high quality red wines require a longer period of bottle ageing before consumption¹. The ageing potential is an impor-tant parameter for wine quality and is related to the capacity of a wine to undergo oxidation over time². Phenolic compounds which are ones of the main substrates for oxidation can then potentially modulate ageing potential³.

Read More

Unexpected relationships between δ13C, water deficit, and wine grape performance

Water nutrition is crucial for wine grape performance. Thus soil investigation aims at characterizing spatial and temporal variability of available water. A possible strategy

Read More

Variabilité spatiale du gel printanier dans le vignoble champenois : application au zonage climatique

In the Champagne vineyards, spring frosts are the cause of significant variations in the volume of the harvest which are very penalizing for the trade. This variability is reflected both in time (years without frost alternating with years with severe frosts) and in space. Certain sectors of the vineyard are in fact statistically more susceptible to frost than others, but each year no municipality can consider itself immune to this climatic accident. The objective of the study is precisely to analyze the spatial distribution of frost and to determine its main mechanisms, linked to the topography of the hillsides, their orientation but also to regional meteorological variables.

Read More

The effect of pedoclimatic conditions on the yeast assimilable nitrogen concentration on white cv. Doral in Switzerland

Aims: Agroscope investigated the efficiency of nitrogen fertilization via foliar urea application at veraison with the aim of raising the YAN (yeast assimilable nitrogen) content in the musts. The observations were conducted on the white grapevine cultivar Doral (Chasselas x Chardonnay) in several pedoclimatic conditions of the Leman wine region, Switzerland, in the years 2012 and 2013. Knowing that the YAN in must plays a key role in wine quality, the aim was finding the main parameters affecting the final YAN level in order to better control them.

Read More

Evaluation of consumer behaviour, acceptance and willingness to return of faulty wines

The analysis of consumer attitudes towards wine, especially towards wines perceived as faulty, is an aspect that requires more research than has been carried out so far [1]. This study aims to analyse consumer behaviour in situations involving the consumption of faulty wines and to assess the level of acceptance of such wines.

Read More