The effect of canopy orientation on fruiting performance of 'Beurre
d'Anjou' pears (Pyrus communis L.) and postharvest urea spray on ovule
longevity and fruit set of 'Doyenne du Comice' pears were studied.
Hedgerows of 'Beurre d'Anjou' pear trees planted in 1969 in two
orientations north-south (N-S) and east-west (E-W) were...
The influence of evaporative cooling for delay of 'Bartlett' and
'Bosc' fruit bud development for frost avoidance was investigated.
Two mist systems, one in a mature pear orchard and the other in a
young pear hedgerow, delayed 'Bartlett' and 'Bosc' bloom up to 15 and
8 days respectively. A low...
Growth, yield components and leaf area were evaluated on
'Starkspur Supreme Delicious' apple on nine rootstocks: MAC 24, EMLA
7, EMLA 26, OAR 1, MAC 9, 0.3, EMLA 9, M 9, and EMLA 27. Estimates of
planting density based on growth, estimates of leaf area based on
four independent variables...
In the Northwest, two tree fruit production problems may be
related to the role of ethylene on plant growth and development:
flowers and developing fruits are subject to low temperature injury
during early spring, and to the low fruit set of 'Comice'. Ethylene
may be involved in influencing dormancy and...
There are several grape disorders that reduce fruit
set. One, millerandage, is from poor fertilization to
produce "hen and chicken" or small seedless berries; while
another, Coulure, is the failure of grape flowers to
develop into berries. A third one, inflorescence necrosis
(INec), is a disorder that should be in...
Inflorescence necrosis (IN) is a recently described disorder in grapes
characterized by partial or complete deterioration of the pedicel and rachis near
bloom. Elevated levels of ammonium in the rachis are associated with the
incidence of IN and hypothesized as the cause of the disorder. An incubation
system with single-node...
The use of grass cover crops is a recommended practice in
nonirrigated vineyards in the Willamette Valley, Oregon. Two
studies were initiated to investigate the competitive and
noncompetitive effects of grass cover crops on the growth and
development of Pinot noir grapevines. Two greenhouse pot culture
experiments were performed to...
Several effects of xylem discontinuity in Pinot noir and Merlot grape berries were studied. There was a reduction in the amount of apoplastic dye (Eosin Y or azosulfamide) uptake through cut pedicels into soft versus firm berries, suggesting a reduction in maximal xylem flow at that time. Both greenhouse and...
Dormancy of 'Pinot Noir' grapevines was characterized. Primary buds
required ca 300 cumulative chilling hours (CCH) to initiate the transition from
endodormancy to ecodormancy, which occurred in mid November. Additional
chilling, up to 1000 CCH, improved budbreak. Changes in bud water content
were estimated by gravimetric and spectroscopic methods. Total,...
A perennial grass grown in strips between the rows of grapevines, with a bare soil herbicide strip under the rows of vines, is a common form of vineyard soil management. Irrigation, though not practiced for grape culture in western Oregon at this time, could be used to supplement the soil...
The WAB granted me a travel grant of $500 to spend two weeks visiting Helmut Becker at Geisenheim, Germany; Norbert Becker in Freiburg, Germany; Pierre Huglin and Christophe Schneider at Colmar, France; Raymond Bernard and Pierre Dupuy in Dijon, France; and Alain Carbonneau at Bordeaux, France. A full and quite...
This summer Dr. Nelson Shaulis, from Cornell University, was invited to visit Oregon as a consultant and lecturer. His visit was sponsored by the Sokol Foundation, Oregon State University, and the Oregon Wine Advisory Board. Dr. Shaulis visited 21 vineyards with Steve Price and myself in 8 viticulture areas during...
The late winter cold front in early February 1989 brought significant snowfall and low temperatures to all of Oregon viticulture and caused considerable vine damage in the northeastern and in some western valleys of Oregon. The lateness of this winter freeze was unusual since most winter damage in the Pacific...
A series of experiments was designed to investigate differential
flood-tolerance and the phenomenon of flood-induced stomatal closure
of several fruit tree species. The first two experiments were conducted
with potted plants submerged outdoors 5-10 cm above the soil line.
Plant morphology, growth, leaf conductance (cL), and soil oxygen diffusion
rate...
Published October 1984. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Spring frost damage to pears in the Pacific Northwest frequently
results in substantial crop losses. This research was undertaken to
investigate the effects of frost on pear buds, flowers, and fruit
through controlled freezing tests and field studies in order to better
understand the frost phenomenon and refine frost protection...
This year's late spring frost prompted a number of growers to call OSU with questions about the fruitfulness of secondary buds and about management alternatives for frost damaged vines. In response to this concern three experiments were established in Willamette Valley vineyards. At Chateau Benoit Vineyard ten vines of MollerThurgau...
Introduction of new winegrape varieties and clones of important commercial varieties in Oregon. zEvaluation of vine and grape characteristics of selected varieties. zEvaluation of phylloxera resistant rootstocks.
Four year old vines of 18 varieties were cane pruned, trained to a Scott Henry, thinned before veraison, and harvested in October and November 1993. Two of the varieties, Chardonnay and Cabernet Sauvignon, were used as standards. Only four varieties were spur pruned to reduce cropping or cluster size: Dolcetto,...
The 18 winegrape varieties in this trial were in fifth leaf in 1994. Vines were pruned in February to either a Scott Henry (4 arms on a vertical trellis using two fruiting wires 12 inches apart at 30 and 42 inch height) or a guyot (a double arm on a...
Objectives:
1. Evaluate canopy management options available to Oregon growers including trellising and pruning for their effects on yield and grape composition.
2. Investigate the relationships between vine growth, cluster environment cluster morphology, and grape composition.
3. Develop techniques that improve the capabilities of Oregon winegrape growers to maximize wine...
In 1983, Muscat Ottonell and other early muscats had a complete crop loss in Willamette Valley vineyards. At that time, we assumed the loss was from a botrytis blossom rot. Since 1983, much has changed: we've seen the disorder every year (it resulted in major crop losses in 1988 and...
To characterize the cultural aspects, maturation, production, and wine quality of several untested Italian, French, and Spanish wine cultivars in southern Oregon.
In the past ten years, variation in Oregon vineyard yields has come from two main causes: winter injury and inconsistent fruit set. Together these factors have caused significant yield variation in almost every Oregon vineyard. In 1991, a research project was started at Oregon State to develop and evaluate a...
Traditional vineyard practices in Oregon are labor intensive and require large pools of available labor for pruning, shoot positioning, and harvest. A mechanized system of grape growing has been developed in Australia to eliminate almost all of the handwork involved with grape production. The cornerstone of this system is minimal...
The 18 winegrape varieties in this trial were in sixth leaf in 1995. Vines were pruned in February to either a Scott Henry (3-4 permanent arms on a vertical trellis using two fruiting wires 12 inches apart at 30 and 42 inch height) plus 2 extra disposal canes on some...
Perennial grass cover crops are frequently grown between the vines in non-irrigated Oregon vineyards. The primary reasons for using cover crops are erosion control and to allow machinery access in wet weather. Grass cover crops may also have an effect on vine performance. These effects, however, are not always clear....
In the Pacific Northwest some prune cultivars often exhibit inconsistent fruit set. Several factors have been associated with this characteristic. Temperature, genotype and boron content are among the most frequently mentioned. Studies were conducted to determine the effect of fall ethephon application on flower bud growth and ovule longevity in...
Anisogramma anomala causes a stem canker of filberts, Corylus avellana. This disease became a threat to the main U.S. filbert growing region when it was introduced into the Pacific Northwest around 1968. Various methods of artificially inoculating filbert trees and seeds were explored. Less than 1% of potted filbert trees...
This study compared leaf mold, bark, automobile waste and the
combination of half leaf on the top and half bark on the bottom as
growing media for young apple nursery stock. Although the chemical
and physical analysis of leaf mold was superior to the bark, trees
in leaf mold showed...
The Oregon Foundation Seed & Plant Materials Project (FS&PMP) is charged with maintaining, increasing, and distributing early generation planting stock of grains, grasses, legumes, potatoes, grapes, and mint to Oregon growers. Early generation seed and plant materials are released to Foundation seed programs for the production of the Foundation class...
The Oregon wine industry is based on a relatively narrow genetic base of grape varieties -and clones. Diversifying varieties that are currently in commercial production by introducing and testing new clones will broaden the scope of those varieties and provide added complexity to the wines. New varieties will expand the...
Objectives:
· Evaluate canopy management options available to Oregon growers for their effects on yield, grape composition, and wine quality.
· Investigate the relationships between vine growth, cluster environment, grape composition and wine quality.
· Develop techniques that improve the capabilities of Oregon winegrape growers to obtain consistent yields with...
Pinot noir research in Oregon is aimed at improving wine quality and production and at increasing the diversity of virus-free clonal material available to our wine industry. Numerous clones of Pinot noir have been identified in France where the cultivar is known for its wide range of genetic variability. Because...
Published November 1967. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
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AUTHORS: Peter Westigard is an associate professor of entomology
and PorterLombard is an
This publication deals with the development of integrated pest management of insect and mite species that attack pears in southern Oregon. Since about 1900, when the pear industry became firmly established in this area, losses from arthropod pests have been an important and occasionally limiting factor to the continuous production...
Published June 1986. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
The dynamics of N was studied in field grown Comice/Provence
quince BA29 pears in Medford, Oregon. Total tree biomass, N content,
and ¹⁵N evaluations suggest that young pears require little N (48 kg
N ha⁻¹ yr⁻¹). About 45% of total tree N present in dormant trees was
remobilized into new...
Boron sprays produced fruit set increases in 'Barcelona'
hazelnut orchards in 1984 and in 1985. The absolute fruit set was
correlated with leaf B content but not with nut B. With relative
fruit set (RFS), B content of nuts in May (r = 0.63**) was more
strongly related to set...
This study evaluates Beufil's Diagnosis and
Recommendation Integrated System (DRIS) on hazelnuts.
Although sufficiency ranges are currently the main
approach for fertilizer recommendations in Oregon, DRIS
enhanced nutritional interpretations, and might alter
recommendations. Reference values (DRIS norms) were
developed using 15 years of published and unpublished
field data. DRIS indices...