GiESCO 2019 banner
IVES 9 IVES Conference Series 9 GiESCO 9 GiESCO 2019 9 Sustainable yield management through fruitfulness and bunch architecture manipulation

Sustainable yield management through fruitfulness and bunch architecture manipulation


Context and purpose of the study ‐ Vineyards are highly variable and this variation is largely driven by environmental conditions and seasonal variation. For example, warm temperatures and sunny days during bud initiation generally result in high yields in the next season while cold periods during flowering and fruitset can reduce yield. As such, this variation in yield and potentially quality is difficult to predict and therefore manage. Early and more accurate assessments of fruitfulness and bunch architecture may improve these predictions. Vineyard management can be used to manage this variation and limit negative impacts on production. This study summarises research that; (1) investigated different methods for the assessment of bud fertility and bunch architecture and (2) assessed the impact of different management techniques on fruitfulness, bunch architecture and resultant yield.

Material and methods – Vineyard management trials were carried out in South‐eastern Australia during the last 4 years and were performed on Syrah, Cabernet Sauvignon, Semillon, Riesling, Grenache, Tempranillo, Merlot and Sauvignon Blanc. Management strategies investigated include; winter pruning, shoot thinning, shoot leaf removal, and bunch thinning. Bud dissection and image analysis was used to assess bud fertility and the size of inflorescence primordia. Image analysis during the growing season and at harvest was used to assess bunch architecture and bunch volume. Bunch weight and yield were determined at harvest to assess yield performance and validate early predictions.

Results – Bud dissection using image analysis was an effective method for early prediction of fruitfulness and bunch weight (R2=0.79). Similarly, assessing bunch volume at veraison correlated with bunch weight 2 at harvest (R =0.78). Assessment methods used in these studies have the potential to be used commercially for yield prediction and management. Management strategies applied in different experimental trials varied in their impact on both bud fertility and bunch architecture (in the current and future seasons). Not surprisingly, timing, extent of application as well as variety had an impact on the final outcome. Understanding how different vineyard management approaches can manipulate components of yield can help producers to manage their vineyards to desired yield and quality outcomes. 


Publication date: June 22, 2020

Issue: GiESCO 2019

Type: Article


Cassandra COLLINS (1), Xiaoyi Wang (1), Marco ZITO (1,2), Jingyun OUYANG (1), Annette JAMES(1), Roberta DE BEI (1), Catherine KIDMAN (1,3), Peter DRY(1)

(1) The University of Adelaide, School of Agriculture, Food and Wine, Waite Research Institute, PMB 1 Glen Osmond, 5064, South Australia. Australia
(2) Istituto di Scienze della Vita, Sant’Anna School of Advanced Studies, Piazza dei Martiri della Libertà 33, 56127 Pisa, Italy
(3) Wynns Coonawarra Estate, PO Box 319 Coonawarra, South Australia 5263, Australia

Contact the author


bunch architecture, canopy management, bud fertility, fruitset, yield management


GiESCO 2019 | IVES Conference Series


Related articles…

The influence of different fertiliser applications and canopy management practices on the potassium content and pH of juice and wine of Vitis vinifera L. cvs. Cabernet-Sauvignon and Cabernet franc

In an attempt to reduce the pH of juice and wine, different fertiliser applications and canopy management practices were evaluated in South Africa in a field trial. Fertiliser treatments entailed no, CaSO4, Ca(OH)2, and MgSO4 fertilisation.

Exploring the genetic diversity of leaf flavonoids content in a set of Iberian grapevine cultivars: preliminary results

The use of grapevine genetic diversity is a way to mitigate the negative impacts of climate change on viticulture systems. Leaf epidermal flavonoids (including flavonols and anthocyanins) are involved in plant defense mechanisms against environmental stresses, like high temperatures or excessive solar radiation [1,2]. Among other factors, they modulate light absorption, which reduces photoinhibition processes in photosynthetic tissues [1]. Therefore, the identification of grapevine cultivars with an increased content on leaf epidermal flavonoids arises as a potential avenue to improve grapevine tolerance to some detrimental environmental stresses.

Phenology and maturation of Cabernet Sauvignon grapes from young vineyards at Santa Catarina state, Brazil – a survey of vineyard altitude and mesoclimat influences

Cabernet Sauvignon grapes from recently planted vines in Santa Catarina State (Brazil), were sampled during ripening from the 2005 and 2006 vintages.

Effect of mixed Torulaspora delbrueckii-Saccharomyces cerevisiae culture on rose quality wine

Alcoholic fermentation using no Saccharomyces wine is an effective means of modulating wine aroma. This study investigated the impact of coinoculating Torulaspora delbruecki with two Saccharomyces cerevisiae commercial yeast (QA23, Lallemand; Red Fruit, Sepsa-Enartis) on enological quality parameters, volatile composition and sensory analysis. The following assays were performed on Tempranillo variety: Saccharomyces QA23 (CTQA), Saccharomyces Red Fruit (CTRF), coinoculated T. delbrueckii + S.cerevisiae QA23 (CIQA) and coinoculated T. delbrueckii + S.cerevisiae (CIRF).

The state-of-the-art of grapevine biotechnology and new breeding technologies (NBTS)

 The manipulation of the genetic basis controlling grapevine adaptation and phenotypic plasticity can be performed either by classical genetics or biotechnologies.