terclim by ICS banner
IVES 9 IVES Conference Series 9 Optimizing disease management in the Rioja wine region: a study on Erisiphe necator and the Gubler-Thomas model

Optimizing disease management in the Rioja wine region: a study on Erisiphe necator and the Gubler-Thomas model

Abstract

Erisiphe necator is endemic in the Rioja Appellation of Origin. Vine growers exert significant effort to protect their crops, given the economic losses this disease causes. Different studies have shown that using Gubler-Thomas Model (GTM) can reduce treatments by up to 20% compared to a full-time protection strategy. This reduction is achieved by optimizing applications based on temperature variations in late spring and summer when the disease’s conidial stage is active. Additionally, since GTM is quite conservative further reductions in sprayings seem feasible.
To evaluate GTM and disease severity, 11 experimental plots with three treatments: a) Unsprayed Control (UC), b) Fully Protected crop – periodic sprayings according to product prescriptions (FP), and c) sprayings following Gubler-Thomas (GT) were established in different areas of La Rioja wine region from 2018 to 2023. Results revealed significant variability in disease severity, with some years experiencing minimal damage in bunches across all treatments, including UC. GTM did not detect these variations in disease severity, indicating a similar risk level between years. Despite this, following GTM advice instead of FP practice lead to a 20% reduction in treatments, with no effect on disease symptoms on the bunches.
This raises questions about the seasonal variation. Are spring conditions causing higher severity during the conidial stage? Is there a specific climatic parameter or measurement distinguishing a severe season from a mild one? Factors like radiation, precipitation, or extreme temperatures in different months might contribute to this variability.

Download the abstract

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster

Authors

Joaquín Huete1*, Vanessa Tobar1, Beatriz López2, Alicia Pou3

1 Servicio de Producción Agraria. DG. Agricultura y Ganadería. Gobierno de La Rioja
2 Consejería. Educación, Cultura y Turismo. Gobierno de La Rioja
3 Instituto de Ciencias de la Vid y el Vino (ICVV). CSIC

Contact the author*

Keywords

powdery mildew, bioclimatic models, Gubler-Thomas

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Consequences of apical leaf removal on grapevine water status, heat damage, yield and grape ripening on Pinot n and Chardonnay

Climate change presents a significant challenge to grape growing worldwide as increased temperatures lead to wines with increased sugar and pH levels. Manipulation of the exposed leaf area is a powerful lever governing the assimilation and storage of non-structural carbohydrates in grapevines. Reducing the leaf-to-fruit ratio is now considered as a tool for adapting to hotter and dryer grape growing conditions.

Read More

METHYL SALICYLATE: A TRENDY COMPOUND MARKER OF ZELEN, A UNIQUE SLOVENIAN VARIETY

The wine market interest for autochthonous varieties, particularly from less known wine regions, has significantly raised in the past few years. In that context, Slovenia, a small country from central Europe with a long winemaking tradition, is getting more and more attention, particularly through its range of unique regional varieties. Among them, Zelen, meaning “green” in Slovene, can only be found in the Vipava valley region, located on the western side of the country, near the border with Italy. When they are young, Zelen wines display very singular aromas reminiscent of rosemary, sage and white fruit. Despite its uniqueness, Zelen wine aromatic typicality is poorly documented in the literature.

Read More

Importance of the Terror Variability Map (TVM) in Precision viticulture (PV): choice of methodology for soil classification

The Precision Viticulture (PV) is defined “as a management system that is information and technology based, is site specific and uses one or more of the following sources of data: soils, vigour, nutrients, pests, moisture, and yield among others, for optimum profitability, sustainability, and protection of the environment” (OIV, 2018, in process). The elements mentioned in the definition are an important part of the terroir components. The terroir is a tool In Viticulture, it is the analysis and study unit, and the variability of a certain situation can be due to any difference in every element or property of each factor that constitutes it, including the management.The soil and its management are those that bring the most variability to terroir.

Read More

Impact of type of winemaking vessel on the chemical composition and sensory attributes of Sauvignon blanc wines

In this video recording of the IVES science meeting 2024, Mariona H Gil i Cortiella (Universidad Autónoma de Chile, Santiago de Chile, Chile) speaks about the impact of type of winemaking vessel on the chemical composition and sensory attributes of Sauvignon blanc wines. This presentation is based on an original article accessible for free on IVES Technical Reviews.

Read More

Impact of pruning method on vegetative growth and yield

Over the past fifteen years or so, a number of theories have emerged on more or less new pruning practices.

Read More