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.

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…

Plant regeneration via somatic embryogenesis and preliminary trials for the application of the DNA-free genome editing in grapevine cv. Corvina veronese

Grapevine (Vitis spp.) is a globally significant fruit crop, and enhancing its agronomic and oenological traits is crucial to meet changing agricultural conditions and consumer demands. Conventional breeding has played a key role in domesticating grapevine varieties, but it is a time-consuming process to develop new cultivars with desirable traits for cultivation.
New plant breeding techniques (NpBTs) offer a potential revolution in grapevine cultivation, and genome editing has shown promise for targeted mutagenesis. The success of these biotechnological approaches relies on efficient in vitro regeneration protocols, particularly through somatic embryogenesis (SE).

Fingerprinting as approach to unlock black box of taste

The black box of taste is getting unlocked. The starting point is to distinguish taste from tasting. Consider taste as a product characteristic; tasting is a sensorial activity. Consequently, taste can be studied on a molecular level and therefore be assessed more objectively, whilst tasting is a human activity and by definition subjective.

Dynamics of soil and canopy temperature: a conceptual approach for Alentejo vineyards

Climate change imposes increasing restrictions and risks to Mediterranean viticulture. Extreme heat and drought stress events are becoming more frequent which puts in risk sustainability of Mediterranean viticulture. Moreover row crops e.g. grapevine for wine, are increasingly prone to the impact of more intense/longer exposure time to heat stress. The amplified effects of soil surface energy reflectance and conductance on soil-atmosphere heat fluxes can be harmful for leaf and berry physiology.

The use of zirconia dioxide enclosed in a metallic cage for the stabilisation of Chardonnay white wine

White wines are commonly stabilised by removing the heat unstable proteins through adsorption by bentonite, an effective but inefficient wine processing step. Alternative absorbents are thus sought and zirconium dioxide (zirconia) is recognised as a promising candidate.

Effect of pre-fermentative strategies on the polysaccharide composition of must and white wines

Among the macromolecules of enological interest in white wines, much attention has been paid to polysaccharides.