Pâmela PITHAN1, Lucas GARRIDO3, Diniz ARRUDA 1, Adriane THUM1,2,Rosemary HOFF3, Jorge DUCATI1* 1 Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves 9500, 91501-970 Porto Alegre, Brazil 2 Universidade do Vale do Rio dos Sinos, Av. Unisinos 950, 93020-190 São Leopoldo, Brazil 3 Empresa Brasileira de Pesquisa Agropecuária, R. Livramento 515, 95701-008 Bento Gonçalves, Brazil *Corresponding author:ducati@if.ufrgs.br

Context and purpose of the study ‐ Phytopathogenic diseases impact the development and yield of grapevines, resulting in economical, social and environmental losses. Sick plants have their metabolism changed, leading to alterations in their reflectance spectra. Little is known on these alterations, and a better knowledge could be used in the dev...

Laura de PALMA1*, Patrizio LIMOSANI1, Vittorino NOVELLO2 1 2 University of FOGGIA-SAFE, Via Napoli 25, I-71122, Foggia, Italy University of Turin-DiSAFA, Largo Braccini 2, I-10095, Grugliasco (TO), Italy *Corresponding author: laura.depalma@unifg.it

Context and purpose of the study ‐ Protecting table grape vineyards with white hail‐nets is a common practice in Southern Italy. Hail‐nets result in shading effects of 10‐20%, depending on their density and type of weave, thus they act as a low shading nets and modify the vineyard microclimate. Darker nets are more opaque to solar radiatio...

Glenn MCGOURTY , Michael I. JONES , Anita OBERHOLSTER , Ryan KEIFFER 1 1 University of California Cooperative Extension Mendocino County, 890 North Bush Street, Ukiah, Ca. 95482 2- University of California Davis Department of Viticulture and Enology, Davis,California, 95616 *Corresponding Author:gtmcgourty@ucanr.edu

Context and purpose of study ‐ Wineries may randomly reject fruit from vineyards near wild fires exposed to smoke. It is difficult to determine if fruit has been compromised in quality when exposed to smoke, and whether or not smoke taint flavors will result when fruit is fermented into wine. Phenolic smoke compounds bind with sugars in the frui...

Romane MELYON‐DELAGE1, Benjamin BOIS2, Sébastien ZITO2, Mario REGA2, Guillaume GARIN1, Amelia CAFFARRA1 1 2 itk, Cap Alpha, Avenue de l’Europe, 34830 Clapiers, France CRC, Biogéoscience, Université de Bourgogne Franche Comté, 2 Bld Gabriel, 21000 Dijon, France *Corresponding author:amelia.caffarra@itk.fr

Context and purpose of the study ‐ The spatial distribution of powdery mildew is often heterogeneous between neighboring plots, with higher disease pressure in certain places that can be considered as disease “hotspots”. The position of hotspots can vary over the years, even if some plots consistently present a higher vulnerability over time...

Jim MEYERS1, Nick DOKOOZLIAN2, Casey RYAN2, Cella BIONI2, Justine VANDEN HEUVEL1 1 Horticulture Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853 and Geneva, NY 14456 2 Viticulture, Chemistry and Enology, E&J Gallo Winery, 600 Yosemite Blvd., Modesto, CA 95354 *Corresponding author: Justine@Cornell.edu

Context and purpose of the study ‐ Random sampling is often considered to be the best protocol for fruit sampling because it is assumed to produce a sample that best represents the vineyard population. However, the time and effort in collecting and processing large random samples can be cost prohibitive. When information about known field variab...

Elisa MARGUERIT *, Loïc LAGALLE , Maria LAFARGUE , Jean‐Pascal TANDONNET , Jean Pascal GOUTOULY1, Isabelle BECCAVIN2, Marilyne ROQUES2, Laurent AUDEGUIN2 and Nathalie OLLAT1. 1 UMR EGFV, Bordeaux Sciences Agro, INRA, University of Bordeaux, ISVV, 210 Chemin de Leysotte, F33882 Villenave d’Ornon, France 2 Institut Français de la Vigne et du Vin, Pôle National Matériel Végétal, F-30240 Le Grau du Roi, France *Corresponding author: elisa.marguerit@agro-bordeaux.fr

th Context and purpose of the study ‐ Grapevine is grown as a grafted plant since the end of the 19 century. The large majority of rootstocks were selected at this period. Among the large diversity of existing rootstocks, few of them are commercially used in the vineyard. However, rootstocks could be considered as a relevant way of adaptation to...

Mark MATTHEWS Dept. of Viticulture and Enology, Univ. California-Davis, Davis, CA 95616 Corresponding author: mamatthews@ucdavis.edu

Context and purpose ‐ Many fleshy fruit, including the grape berry, exhibit a double‐sigmoid growth (DSG) pattern. Identification of the curious DSG habit has long been attributed to Connors’ (1919) work with peaches. Connors’ description of a three‐stage pattern consisting of two growth stages (Stage I and Stage III) separated by a rest...

Johann MARTíNEZ‐LUSCHER1 , Constance Cunty2, Luca BRILLANTE3, Runze Yu1, Gregory 2 1* Gambetta , S. Kaan KURTURAL 1 2 Univeristy of California Davis 1 Shields Ave. Davis, CA 95616 USA UMR EGFV ISVV, 210 Chemin de Leysotte - CS 50008 33882 Villenave d'Ornon Cedex, France 3 California State University Fresno 2360 E. Barstow Ave. Fresno, CA 93704 USA *Corresponding author: skkurtural@ucdavis.edu

Context and purpose of the study – The dormant and growing season temperatures in California USA have been increasing with more clear sky days. A consequence increasing temperatures and clear sky days is water deficit conditions. Viticulturists must determine appropriate balances of canopy management and irrigation budgeting to produce suitable ...

Johann MARTÍNEZ‐LÜSCHER1*, Luca BRILLANTE 2,3, S. Kaan KURTURAL 1 1 2 Department of Viticulture and Enology University of California, Davis, U.S.A. Department of Viticulture and Enology California State University, Fresno, U.S.A. *Corresponding author: jdmar@ucdavis.edu

Context and purpose of the study ‐ Exposure to solar radiation affects berry composition through photomorphogenesis or changes in temperature. Flavonol synthesis is upregulated by UV‐B radiation leaving a fingerprint on flavonol profile. This study aimed to test the factors affecting flavonol accumulation and profile and their potential as an ...

Diana MARÍN1*, Rafael GARCÍA2, Javier ERASO2, Jorge URRESTARAZU1, Carlos MIRANDA1, José Bernardo ROYO1, Francisco Javier ABAD1,3, Luis Gonzaga SANTESTEBAN1 1 Dept. of Agronomy, Biotechnology and Food Science, Univ. Pública de Navarra, Campus Arrosadia, 31006 Pamplona, Navarra, Spain 2 Vitis Navarra Nursery, Carretera Tafalla km 18, 31251 Larraga, Navarra, Spain 3 INTIA, Edificio de Peritos Avda. Serapio Huici nº 22, 31610, Villava, Spain *Corresponding author: diana.marin@unavarra.es

Context and purpose of the study ‐ The choice of an adequate rootstock is a key tool to improve the performance of grapevine varieties in different ‘terroirs’, as rootstocks confer adaptation to soil characteristics such as salinity, acidity, lime content or drought. Moreover, it is well‐known that rootstocks also have a significant influe...

Szabina LENGYEL , Randall E. GOLD , Jochen FISCHER , Alexander YEMELIN , Eckhard THINES1, Annett KÜHN2 1 Institut für Biotechnologie und Wirkstoff-Forschung gGmbH, Erwin-Schrödinger-Straße 56, D-67663 Kaiserslautern, Germany 2 BASF SE, Agricultural Center, Speyerer Straße 2, D-67117 Limburgerhof, Germany *Corresponding author:lengyel@ibwf.de

Context and purpose of the study ‐ The presence of grapevine trunk diseases (GTDs) related pathogens leads to severe economic losses in wine‐growing regions all over the world. GTDs cause foliar discoloration, stunted growth, decline, sectorial and/or central necrosis of the trunk wood, and dieback, while the quality and the quantity of the gr...

Carlos M. LOPES , Marta VENDEIRO, Ricardo EGIPTO , Olfa ZARROUK , M. Manuela CHAVES 1 LEAF, Instituto Superior de Agronomia, Universidade de Lisboa, Portugal 2 Instituto de Tecnologia Química e Biológica, Oeiras, Portugal *Corresponding author: carlosmlopes@isa.ulisboa.pt

Context and purpose of the study ‐ Recently early defoliation (ED) has been tested in several high‐ yielding grapevine varieties and sites aiming at reducing cluster compactness and hence, regulating yield and susceptibility to botrytis bunch rot infection. The reported results have been generally positive, encouraging growers to use this cano...

Cécile LAURENT1,2,3,* Meïli BARAGATTI4, James TAYLOR1, Bruno TISSEYRE1, Aurélie METAY2, Thibaut 3 SCHOLASCH 1 2 ITAP, Univ. Montpellier, Montpellier SupAgro, Irstea, France SYSTEM, Univ Montpellier, CIHEAM-IAMM, CIRAD, INRA, Montpellier SupAgro, France 3 Fruition Sciences, Montpellier, France 4 MISTEA, Univ Montpellier Montpellier SupAgro, INRA, France *Corresponding author : cecile@fruitionsciences.com

Context and purpose of the study – Vine development, and hence management, depends on dynamic factors (climate, soil moisture, cultural practices etc.) whose impact can vary depending upon their temporal modalities (timing, duration, threshold, eventually trajectory and memory effects). Therefore, understanding the effect of the temporal variati...

Yevgen KOVALENKO , Ricco TINDJAU , Simone Diego CASTELLARIN 1. Wine Research Centre, The University of British Columbia, 2205 East Mall, Vancouver, BC, V6T0C1, Canada *Corresponding author:simone.castellarin@ubc.ca

Context and purpose of the study ‐ Crop load management by cluster thinning can improve ripening and the concentration of key metabolites for grape and wine quality. However, little work has been done on testing the impact of crop load management on terpene content of white grapes. The goal of the study was to assess if by reducing crop load via...

Georgios C.KOUFOS , Theodoros MAVROMMATIS , Stefanos KOUNDOURAS , Gregory V. 3 JONES 1 Department of Meteorology and Climatology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece 2 Laboratory of Viticulture, School of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece 3 Center for Wine Education, Linfield College, McMinnville, Oregon, USA. * Corresponding author: gckoufos@gmail.com

Context and purpose of the study ‐ Air temperature is arguably one of the most decisive factors for winegrape varieties developmental cycle, ripening potential and yield. Taking into account that predicted future warmer conditions will possibly impose challenges in global viticulture, it is of outmost importance to understand the adaptive capaci...

Ioannis KATSIKIS 1*, Dionissios KALIVAS1*, Georgios KOTSERIDIS2*, Maria Ioanna XENIA 2* 1 AUA Department of Natural Resources Management & Agricultural Engineering, Laboratory of Soil Science and Agricultural Chemistry, G.I.S. Research Group, Athens, Greece 2 AUA Department of Food Science & Human Nutrition, Laboratory of Oenology and Alcoholic Beverages, Athens, Greece *Corresponding author: maria.ioannaxenia@gmail.com

Context and purpose of the study ‐ Nemea region is the largest POD zone in Greece. Agiorgitiko (Vitis Vinifera L. cv.) is the most cultivated variety in Greece with significant wine potential. Due to the extension of the area there is a great variability of soil content and climatic conditions. Seven vineyards in the POD zone were selected and m...

Markus KELLER , Joelle MARTINEZ , Esther HERNÁNDEZ‐MONTES , Yun ZHANG , Ben‐Min CHANG1 Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Road, Prosser, WA 99350, USA 2 Ste. Michelle Wine Estates, 660 Frontier Road, Prosser, WA 99350, USA *Corresponding author: mkeller@wsu.edu

Context and purpose of the study – Heat and drought episodes during the growing season are becoming more frequent and more severe in many of the world’s grape‐growing regions. However, the responses of grapevines to a combination of these stress factors are incompletely understood, which hampers the implementation of deficit irrigation and h...

Cesare INTRIERI, Ilaria FILIPPETTI, Gianluca ALLEGRO, Gabriele VALENTINI, Chiara PASTORE, Emilia COLUCCI Dipartimento di Scienze e Tecnologie Agroalimentari- Università di Bologna Corresponding Author: cesare.intrieri@unibo.it

Context and purpose of the study ‐ In previous experiments carried out in Bologna on Sangiovese grapevines raised with the Australian “Minimal Pruning” system, it has been shown that this system left an excessive burden of buds on the vine (650/meter of row) and inhibited the plant from correctly activating its physiologic self‐regulating ...

Gregory V. JONES Center for Wine Education, Linfield College, 900 SE Baker St, McMinnville, Oregon, USA *Corresponding author: gjones@linfield.edu

Context and purpose of the study The climate has warmed over the past century or more bringing about changes in numerous aspects in both earth and human systems. One of these systems, agriculture, is strongly influenced by climate, which largely determines what type, where, and how crops can be grown. Within agriculture, growing grapes and wine pr...

Bruno HOLZAPFEL 1 1 , Jason SMITH and Stewart FIELD 3 National Wine and Grape Industry Centre, Wagga Wagga, New South Wales 2678, Australia 2 NSW Department of Primary Industries, Wagga Wagga, New South Wales 2678, Australia 3 Nelson Marlborough Institute of Technology, Blenheim 7240, New Zealand *Corresponding author: bruno.holzapfel@dpi.nsw.gov.au

Context and purpose of the study ‐ The nutrient reserves in the grapevine perennial structure perform a critical role in supplying the grapevine with nutrients when demand cannot be meet by root uptake. The seasonal changes in these reserves largely depend on the developmental stage and the associated growth requirements of grapevines. These sto...