Viticulture and Oenology Commons^™

Evaluating Fungicide Programs For Grapevine Disease Management And Fungicide Sensitivity Monitoring, Abraham Ahumada

Master's Theses

Grapevine diseases, such as powdery mildew and Botrytis bunch rot, require repeated fungicide applications to maintain fruit quality and reduce yield losses. However, fungicide performance can vary among products, application programs, disease pressure, and pathogen sensitivity. This thesis evaluated fungicide programs for control of powdery mildew in ‘Chardonnay’ grapes and assessed fungicide sensitivity of Botrytis cinerea isolates collected from California vineyards.

Powdery mildew, caused by the fungal pathogen Erysiphe necator, is a major threat to the production of Vitis vinifera grapes worldwide. Because powdery mildew management relies heavily on fungicide applications, field evaluations are needed to compare the efficacy …

Chemical And Sensory Consequences Of Oxidative And Reductive Handling Of White Wines, Amelia Pargellis

Master's Theses

In the 2024 and 2025 vintage four experiments were performed each with a different varietal, namely Albariño, Grenache blanc, Loureiro, and Vermentino. These experiments investigated the effects of hyperoxygenation, reductive winemaking techniques, while monitoring the oxidation-reduction potential.

Albariño grapes were made following two juice protocols, control/reductive (Reductive Control) and oxidative (HyOx). Reductive Control received antioxidants (50 ppm SO₂, 160 mg/L ascorbic acid) and CO₂ blanketing, and HyOx underwent hyperoxygenation at approximately 700 mL/L/h of air for two hours through a stainless-steel sparging stone with 10-µm pores. Juice was cold-settled and racked. Reductive Control juice was split into …

Interest In Training Certifications Within The Horticulture Industry, Bradley S. Peiffer

Scholars Week

When it comes to post-secondary education, less than half of Americans hold a college degree. While certain industries don’t necessarily need college-level education, they can still have a lot to learn beyond hands-on education and training. Horticulture, for example, can have a large knowledge gap from people with a secondary education only. Oftentimes, a certificate in a field of work can significantly improve knowledge in the workforce without such an extreme time or cost expense. This study investigates whether there is a potential interest in training certifications within the Horticulture Industry. Specifically, this research was conducted to determine if Horticulture …

Guide To The International Pinot Noir Celebration (Ipnc) Collection, Linfield College Archives

Linfield Archives Finding Aids

This collection contains documents, photographs, digital media, artifacts, and real objects of the IPNC from the beginning of the conference’s origins in 1987 through the present day. Included are invitations, newspaper articles, reviews, correspondence between IPNC and wineries, advertisements, magazines, letters, meeting summaries, photographs, negatives, posters, exhibition material, objects that relate to the IPNC, and CDs with digital content.

Measurement And Control Of The Oxidation-Reduction Potential And Its Chemical And Sensory Consequences In Wines, William Jordan Wright

Master's Theses

The oxidation-reduction potential (ORP) is a measurement thought to reflect the overall ability of a solution to oxidize or reduce substances within that solution. In wine, there is no absolute agreement as to which substances control or dominate the ORP; however, oxygen, ethanol, iron-tartrate and copper-tartrate complexes, and glutathione are suspected to play key roles, while sulfur dioxide and phenolics may act as buffers. Anecdotally, some varieties of Vitis vinifera are prone to oxidation while others are prone to reduction, though the chemical basis of this remains unclear. The following works aim to further elucidate the influence of specific chemical …

Minimum Standards Of Maturity For Table Grapes 2025-2026, Department Of Primary Industries And Regional Development, Western Australia

Viticulture research reports

The table shows the approved minimum standard of maturity for each of the standard varieties listed when tested using the approved method. The approved method for testing these varieties is to test the brix (sugar level) of the fruit using a refractometer.

Electric Weed Control—How Does It Compare To Conventional Weed Control Methods?, Catherine Borger, Miranda J. Slaven

Journal articles

Weed management practices in agroecosystems mainly rely on herbicide, mowing, or tillage. Electric weed control offers a novel alternative, with a range of commercially available products for weed management in agricultural environments. However, electrical weed control efficacy has not been effectively compared with conventional weed management practices. Further, electrical weed control products may have a fire risk, as highlighted but not assessed in prior studies. The current study evaluated an electric weed control machine (Zasso™ XPower) for weed management in four vineyard sites (in 2022 and 2023) in comparison to mowing and herbicide applications. Weed control tactics were applied in …

Evaluating Nanobubble-Enriched Water Treatments For Cleaning Stainless Steel Winery Tanks At The Gallo Winery Research Station In Livingston, California, Edgar Godoy-Garcia

Master's Theses

ABSTRACT

Evaluating nanobubble-enriched water treatments for cleaning stainless steel winery tanks at the Gallo winery research station in Livingston, California.

Edgar A. Godoy-Garcia

Sanitation of stainless steel wine storage tanks is a critical component of quality control in commercial winemaking operations. Ineffective cleaning can lead to microbial contamination, product spoilage, and safety concerns. Traditionally, wineries rely on manual scrubbing, chemical cleaning agents, and extensive water rinsing cycles to maintain sanitary tank conditions. However, these methods are resource-intensive and may pose risks to both workers and the environment due to chemical exposure and wastewater generation. In response to growing industry interest …

Potential Economic Impact Of Grapevine Phylloxera (Hemiptera: Phylloxeridae) On Western Australian Winegrapes, David C. Cook, Andrew S. Taylor, Peter S. Gardiner, Rodrigo Pires, Hamish L R Mckirdy, Karen W. Holmes, Helen Spafford

Viticulture Research Articles

Grapevine phylloxera Daktulosphaira vitifoliae Fitch (Hemiptera: Phylloxeridae) has been present in Australia for almost 150 years but has not spread to south-west Western Australia, in part due to the relative isolation of the region. Recent improvements in tourist access, with interstate flights now arriving at Busselton Margaret River Airport, raise concerns about potential phylloxera introductions via wine tourism. In this paper, we simulate the potential economic impact on the Western Australian winegrape industry following a hypothetical arrival event in the Margaret River wine region. We use soil texture maps to assess the suitability of winegrape-growing areas to phylloxera establishment and …

Examining Sustainable And Regenerative Viticultural Practices In The Rheinhessen Wine Region Of Germany, Claire Hoffmann

CISLA Senior Integrative Projects

No abstract provided.

Citrus Fruits Maturity Parameters 2025-2026, Department Of Primary Industries And Regional Development, Western Australia

Viticulture research reports

Under Biosecurity and Agricultural Management (Agricultural Standards) Regulations 2013 Part 5.

Workshop Wine Wednesdays: Change In Behavior Around Local Wines, Aude Watrelot, Sarah Francis, Sarah Al-Mazroa Smith

Journal of Extension

Wine workshops hosted at local wineries positively impacted the behavior of Iowa wine consumers. Many participants (75%) reported visiting an Iowa winery following the workshop. The percentage of participants consuming Iowa wines increased by 20.6% (p

Impact Of Bourbon Continuous Column Operations On Ethyl Carbamate Levels, Brad J. Berron, Jon Brown, Jason Gambrell, Travis Cantrell, Meghan Mcintosh, Sarah A. Wilson, Jarrad Gollihue, Harmonie M. Bettenhausen

James B. Beam Institute for Kentucky Spirits Faculty Publications

European and Canadian regulators enforce strict limits on the ethyl carbamate content of alcoholic beverages. North American distillers’ malt have high glycosidic nitrile levels which amplify the ethyl carbamate level of whiskey. Guidelines are required to produce low ethyl carbamate whiskey from North American distillers’ malts. This work challenges several strategies for reducing ethyl carbamate levels in bourbon and American whiskey products. New make spirit was produced using a bourbon mash bill on a continuous beer still with doubler. The low wines alcohol content and beer feed tray were systematically varied while the caustic cleaning schedules were monitored to generate …

A Mystery Of Microecology: Revealing The Ecological Relationship Between Allorhizobium Vitis And Missouri Native Grape Species, Hunter White

Graduate Theses/Dissertations

Crown gall disease can be very detrimental to grape and wine producers around the world by reducing vine vigor and yield. It is caused by the bacteria Allorhizobium vitis (A. Vitis) carrying a tumor inducing (Ti) plasmid. The A. vitis bacteria have been found in soil and cane tissues in vineyards around the world, and infect all cultivated grapes. However, there have been no reports of crown gall on native wild grapevines, and very little is known about the ecology of A. vitis in native ecosystems. I have sampled cambium tissues from three native wild grape species of …

Identification Of A Stable Qtl For Juice Color In A Vitis Interspecific Hybrid ‘Chambourcin’- Based Population, Qiuni Yang

Graduate Theses/Dissertations

Berry juice color is one of the key factors influencing grape and wine quality, consumer preference, and marketability. While most previous studies on berry color have focused on the skin, research on juice color remains limited. This study investigated the genetic basis of berry juice color in a hybrid population derived from the Vitis interspecific hybrid ‘Chambourcin’ and V. vinifera ‘Cabernet Sauvignon’. A new nine-category visual scoring system was developed to assess juice color based on OIV 225. To achieve comprehensive precision and quantitative analysis, CIELAB parameters (L*, a*, b*), Hue, and Chroma were extracted from image-based measurements. Using berries …

Revolutionizing Grapevine Breeding Programs: A Mobile Genome Editing System For Perennial Crops, Bridget Bolt

Theses and Dissertations--Plant and Soil Sciences

Grapevine (Vitis vinifera) faces unprecedented challenges from climate change, with up to 90% of current growing regions potentially becoming unsuitable for production within decades. Traditional breeding approaches require 25-30 years for variety development, creating a time constraint incompatible with the pace of environmental change. This research establishes the approach for a novel mobile RNA-based gene editing platform that addresses longstanding bottlenecks in grapevine improvement while preserving cultivar identity and reducing breeding timelines.

This research developed a three-component system for transgene-free gene editing in grapevine. First, a mobile CRISPR/Cas9 system was established using Agrobacterium rhizogenes transformation and the cut-and-dip …

Napa Valley Certified Organic Viticulture Napa Valley Vineyards Go Green: Transitioning To Organic Cultivation, Eric E. Tapia

Undergraduate Honors Theses

The shift to sustainable agriculture in Napa Valley necessitates certified organic vineyards among wine industry stakeholders to facilitate systemic change. Nonetheless, numerous impediments—such as fiscal constraints, inadequate access to information, and agricultural education—are intended to address these barriers for fostering an environmental stewardship program focused on innovation and sustainability. The methods employed to investigate the transition to organic vineyards include qualitative and quantitative approaches, such as interviews with vintners and data analysis of annual crop yields and the economic impact of certified organic vineyards in Napa Valley. The investigation reveals that vineyard proprietors face significant early challenges, including a steep …

Growers’ Perceptions And Strategies To Mitigate Spring Frost Injury In Grapevines, Vinicius Cervilieri, Imed Dami, Guilherme Signorini

Journal of Extension

Uncertain weather patterns raise concerns about frequent spring frosts and injury in grapevines. This article quantifies growers’ perceptions of susceptibility to spring frosts and examines their satisfaction with existing mitigation strategies. Departing from a survey with grape growers, results show that over 80% of sampled growers have experienced damage due to frosts. Over-vine sprinklers, proper site selection, and adoption of late budding cultivars are the practices with the highest satisfaction levels. None of the strategies examined reached the highest satisfaction score. In addition, 61% of respondents showed interest in sprayable products to delay budbreak and circumvent grapevine damage.

Fer Wine Grapes In Western Australia, Kristen Brodison, Richard Fennessy

Viticulture factsheets

Fer is a French variety known to produce concentrated wines of good colour with a medium to full body. Wine aroma and flavour are typified by dark fruits and spice with soft tannins.

Fer grapevines were evaluated for fruit and wine production in Manjimup from 2007 to 2010.

Fer was found to be late ripening when grown here although it showed good disease resistance.

Minimum Standards Of Maturity For Table Grapes 2024-2025, Department Of Primary Industries And Regional Development, Western Australia

Viticulture research reports

The table shows the approved minimum standard of maturity for each of the standard varieties listed when tested using the approved method. The approved method for testing these varieties is to test the brix (sugar level) of the fruit using a refractometer