Pinot noir grapevines (self-rooted Pommard clone) were grown in a pot-in-pot sand culture vineyard to examine the impact of low N, P, and K supply on vine growth physiology. Four-year-old vines given either full nutrition (Control) or reduced levels each supplied at 50%, 20%, 10% Control rate with all other nutrients held constant over three years (2006–2008). Vine growth, nutrient status, photosynthetic parameters, yield, berry quality monitored. The status was by intended treatments,...

Traminette is a cold-hardy interspecific Gewürztraminer hybrid winegrape cultivar grown in the eastern United States. A study from 2003 through 2005 investigated impacts of canopy management on aromatic qualities fruit and wine. Cluster-shading treatments under leaf layers (0, 1, 2, >3) synthetic coverings (greenhouse shade cloth light-excluding apple bags) were implemented field trials, composition wine sensory analyses conducted. Fruit fully exposed clusters had 30% higher...

Vigor and crop level management are important practices for premium wine grape production. The implications of thinning ‘Pinot noir’( Vitis vinifera L.) vines varying vigor were investigated in the Willamette Valley Oregon 2011 to 2013 better understand relationship between canopy size yield within framework a cool-climate, production vineyard. To manipulate vigor, competitive grass cover ( Festuca rubra was grown both (Grass), alternating (Alternate), or neither side flanking alleyways...

A study to reassess the nitrogen (N) requirements for Pinot noir was carried out using a pot-in-pot vineyard where N inputs were carefully controlled. grafted on 101-14 rootstock exposed five levels of supply beginning in their fourth growing season, and vine productivity, berry chemistry, must fermentation dynamics studied over three years. altered status vines accordance with expectations. Varying had greater impact vegetative growth parameters than upon reproductive responses. For...

Monoterpenes important to the aroma characterization of grapes and wine were investigated in three cultivars: Gewürztraminer, Riesling, Traminette, a Gewürztraminer hybrid. The comparison was undertaken determine similarities aromatic profile basis for further research with Traminette as quality white hybrid winegrape grown regions eastern midwestern United States. Results indicate that have similar monoterpene constituents very potent floral odorant, <i>cis</i>-rose oxide comprising 13 35%...

Abstract Short Shoot Syndrome (SSS) causes severe crop losses in Oregon vineyards due to bunch necrosis during the early part of season. Other symptoms include malformed leaves, unusually short and angled shoots, scar tissue bronzed leaves close harvest time. This work shows that SSS found is closely associated with grape leaf rust mite, Calepitrimerus vitis (Nalepa) infestations. Very few bud mites, Colomerus (Pagenstecher), were current year no relationship could be between this species....

Growers of high-end ‘Pinot noir’ wine grapes ( Vitis vinifera L.) commonly reduce yield by cluster thinning with the goal increasing fruit quality; however, there are no objectively defined targets to achieve optimum composition. Canopy leaf area relative can affect total soluble solids (TSS), and recommendations have been established for warm grape production regions. However, relationship between photoassimilation differs among climates training systems. Leaf (LA:Y) ratios developed in...

In viticulture, rootstocks are essential to cope with edaphic constraints. They can also be used modulate scion growth and development help improve berry yield quality. The rootstock contribution is not fully understood. Since nitrogen (N) a significant driver of grapevine growth, properties associated N uptake transport may play key role in the potential grafted grapevines. We evaluated potted system using two grapevines [Riparia Gloire (RG) 1103 Paulsen (1103P)] Pinot noir (Pommard clone)...

Five vineyard floor management treatments were evaluated for effects on weed control over two growing seasons in an establishing ‘Chardonnay’ ( Vitis vinifera ) the Willamette Valley of Oregon. Four cover crop and unplanted treatment compared to assess vine row alleyway coverage densities broadleaf grass weeds. A winter annual was grown alleyways cover-cropped mowed spring. The residue managed as follows: 1) transferred in-row mulch representing industry practice “mow-and-throw,” 2) at three...

The performance of own-rooted Traminette vines was investigated over a 5-year period on three training systems: high cordon (HC), midwire (MWC), and Scott Henry (SH). Yield, vine size, canopy density were strongly influenced by system. Berry composition (soluble solids, pH, titratable acidity monoterpenes) only slightly Vines trained to divided-canopy SH had the highest yield largest resulting in mean crop load (ratio cane pruning weight) 7.8, which is at low end generally accepted...

Oregon's wine grape industry uses yield targets to achieve quality in Pinot Noir vineyards, and this practice has led increases cost of production. A multiapproach study was conducted investigate how vineyard target yields are set, why thresholds exist, who influences decisions related yields. Growers suspect that higher possible without compromising quality, but they unable change due winery buyer decision making. To be effective eliciting realizing impact, Extension educators need do...

Developmental parameters of protogyne Calepitrimerus vitis (Nalepa) (Acari: Eriophyidae) were determined at 12, 15, 17, 22, 25, 28, 31, and 34°C to better understand seasonal activity, population growth, ultimately more effectively manage pest mites in wine grapes. Net reproductive rate (Ro) was greater than zero all temperatures with the maximum Ro (9.72) 25°C. The lowest estimated (0.001) occurred 34°C. There a gradual decrease mean generation time (T) as increased from 17 31°C. shortest...

<h3>Summary</h3> <h3>Goals:</h3> Winegrape production is more costly in Oregon than other US growing regions, and industry faces rising costs labor concerns. Growers are considering ways to reduce introduce mechanization. Spur pruning requires less readily mechanized cane pruning; however, the majority of growers use pruning. We conducted surveys interviews understand why preferred determine potential barriers adopting spur a vineyard case study quantify fruitfulness yield cane- spur-pruned...

The grape rust mite [ Calepitrimerus vitis (Acari: Eriophyidae)] is an important pest of grapevines ( Vitis sp.) in grape-growing regions around the world. A rapid method for extracting eriophyoid mites was adapted from earlier studies to provide integrated management (IPM) consultants and commercial growers with a practical, efficient, reliable tool monitor vineyards nursery stock vines. rinse bag (RIB) allows quick extraction young shoots or leaves using 35% 70% ethanol isopropanol...

Grapevine red blotch disease (GRBD) has negative effects on grape development and impacts berry ripening. Abscisic acid (ABA) is a plant growth regulator involved in the initiation of Exogenous abscisic application was compared to an unsprayed control GRBD-positive Pinot noir vines during two vintages, total monomeric anthocyanin, phenolics, phenolic composition, volatile profile were measured wines. In addition, untargeted metabolites profiled using high-resolution LC-MS/MS. Results showed...

<h3>Summary</h3> <h3>Goals:</h3> Oregon Pinot noir growers prefer head training and cane pruning to cordon spur pruning, referred herein as respectively. With decreasing labor availability increasing production costs, are interested in transitioning improve vineyard economics because requires less manual is easier more economical mechanize than pruning. However, they hesitant adopt of fears reduced inconsistent yields, believe has unfruitful basal buds. We conducted a two-year field trial...