Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 46 for “"Grapevines"”.
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Selection for Run1-Ren1 Dihybrid Grapevines Using Microsatellite Markers
Powdery mildew is a major fungal disease of grapevine worldwide, and the control of which relies on large quantities of fungicide, accounting for a considerable cost for grape growers. Genetically controlled resistance is a promising alternative to the recurrent application of chemicals.The …
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Ecology, Ecophysiology and Morpho-colorimetric analysis of wild grapevines populations of Sardinia and relationships with some autochthonous cultivars
… and morpho-colorimetric analysis of wild grapevines populations and relationships with some autochthonous cultivars can be carried out. The peculiar insular condition of Sardinia and the large population of wild grapevine coenosis distributed in the whole island, allowed the local …
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The Relationship Between Mineral Nutrition and Late-Season Bunch Stem Necrosis of Cabernet Sauvignon (Vitis vinifera L.) Grapevines
… and the incidence of BSN of Cabernet Sauvignon grapevines. Nutrients, used alone or in combination, included nitrogen, magnesium, and calcium. During the 1997 and 1998 seasons at Leesburg vineyard, applications of nitrogen, magnesium, and calcium produced little change in bloom-time petiole …
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Anatomical Developments and the Role of Carbohydrate or Mineral Nutrient Deficiency in Bud Necrosis of 'Riesling' grapevines (Vitis Vinifera L.)
… the onset of BN in 'Riesling' and 'Chardonnay' grapevines were characterized. Examination of ultrathin (1micro m) sections of 'Riesling' buds under a light microscope revealed a zone of compressed cells immediately beneath the primary bud axis within 60 days after budbreak. Cell rupture occurred …
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Aplicación foliar en el viñedo de un extracto del alga Ascophyllum nodosum como herramienta para mejorar la composición nitrogenada, fenólica y aromática de la uva y del vino de las variedades Tempranillo y Tempranillo Blanco
… in several crops and woody species, including grapevines. However, the studies about the effects of foliar applications of seaweeds to grapevines are mainly focused on their effects on plant physiology, productivity, physicochemical parameters of musts and wines and the synthesis of certain …
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Nuevas aportaciones al conocimiento y utilización de productos fitosanitarios para el control de enfermedades de la vid: Evaluación de posibles efectos sobre la fermentación y elaboración de vinos de calidad
… prohexadione calcium application in Tempranillo grapevines was studied. This research was innovative and original in Spain and the European Union. The results have shown that the application of the fungicide pyrimethanil did not systematically affect the enological parameters. It did not modify …
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Documentation of grapevine leafroll-associated viruses in wine grape varieties and native grape species in Virginia, and examination of the movement of grapevine leafroll disease to develop management strategies
… A statewide survey of commercial and wild grapevines in Virginia was conducted during 2009 through 2011. Also, vector management options were tested in two field studies. GLRaV-2, GLRaV-3, and GFkV were detected in 8%, 25%, and 1%, respectively, of over 1,200 vine samples (41 wine grape …
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The Effect of Complete Vineyard Floor Ground Covers and Root Pruning on Cabernet Sauvignon
… the grasses were not overly competitive with grapevines. Root pruning and complete vineyard floor cover crops favorably reduced grapevine vegetative growth, although treatment effects diminished over time, possibly in response to redistribution of grapevines’ roots and climatic variation at …
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Optimizing nitrogen fertilization practices under intensive vineyard cover cropping floor management systems
… and berry nitrogen parameters of cover cropped grapevines. The research described herein involved Sauvignon blanc, Merlot, and Petit Manseng grapevines (Vitis vinifera L.) subjected to different sets of nitrogen treatments, and was primarily conducted over two years. There were very few …
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Automated Pruning of Greenhouse Indeterminate Tomato Plants
… There has been research in automated pruning of grapevines, trees, and other plants, but tomato plants have yet to be explored. Wage increases are contributing to the depleting profits of greenhouse tomato farmers. Rises in population are the driving force behind the need for efficient growing …
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Developing a Genetic Transformation Protocol for American Grapes (Vitis X Lambruscana) and Transforming Vitis to Produce Parthenocarpic Fruits
… scope to study and understand seedlessness in grapevines.
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Determining the threat of Pierce's disease to Virginia vineyards
Pierce's disease (PD) is a vascular disease of grapevines caused by <i>Xylella fastidiosa</i> (Wells et al.) (<i>Xf</i>) which is transmitted by xylophagous insect vectors. PD infection in Virginia vineyards was thought to be isolated to southeastern portions of the state as there have been no …
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Effect of vineyard management of Cabernet Sauvignon (Vitis vinifera L.) grape glycosides
… zone leaf removal of mature Cabernet Sauvignon grapevines were evaluated for their influence on red-free GG. Two shoot densities were examined, each with no leaf removal (No LR), mechanical leaf removal (M LR) or mechanical plus hand leaf removal (M+H LR) imposed five weeks post-bloom. Red-free …
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Characterization of grapevine vein clearing virus expression strategy and development of caulimovirus infectious clones
… citrus mealybugs were collected from infested grapevines in the Ashland-Gravel greenhouses (University of Missouri). Both populations were able to acquire GVCV after short feeding periods of as little as three days. However, the tucker population was not able to persist on grapevines and was …
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PHYTOPLASMAS-ENDOPHYTES INTERACTIONS: THE CASE STUDY OF GRAPEVINE YELLOWS RECOVERY
… bacteria and phytoplasmas associated with grapevines to clarify the role of endophytic bacteria in grapevine yellows (GY) recovery and discuss the possibility to apply these bacteria for GY management. Diversity of bacterial endophytes associated with grapevine leaf tissues was analyzed by …
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Modest Differences in Juice Yeast Assimilable Nitrogen Concentration and Composition Influence Wine Chemistry and Impart Limited Sensory Differences in Virginia-grown Chardonel
… evaluating the impact of nitrogen fertilizer on grapevines. The objective of this work is to determine if vineyard treatments resulted in sufficient juice YAN profile differences to impart chemical and/or sensory differences in resulting wines. Grapes were combined from each field replication of …
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Development of biotools for vineyard-associated pest and disease control based on entomopathogenic nematode symbiotic bacteria
… and diseases that pose significant threats to grapevines. Therefore, the specific objectives to accomplish during this Thesis were as follows: (i) to evaluate the insecticidal and antifungal effect of the soluble toxins produced by Xenorhabdus and Photorhabdus for controlling vineyard pests and …
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The effects of vineyard management and primary and secondary fermentations on grape glycoconjugates and conjugate fractions
… mature Cabernet Sauvignon (Vitis vinifera L.) grapevines in eastern Virginia in 1996 to determine the effects on grape chemistry, glycoconjugates, and conjugate fractions. Reduced shoot density generally resulted in higher berry weight and lower soluble solids (°Brix) at each sampling date. …
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Molecular intervention in Pierce's Disease
… one of the most devastating diseases threatening grapevines in the USA caused by the Gram negative bacterium Xylella fastidiosa. There is no effective control method for Pierce’s Disease and control is mainly achieved by suppressing transmission of the glassy winged sharpshooter (GWSS) insect …
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Effects of Nitrogen and Potassium Fertilizer on Willamette Spider Mite (Eotetranychus willamettei) (Acari: Tetranychidae)
… causes physical harm and potential damage to grapevines (Vitis vinifera) along the central and north coast of California as well as Washington and Oregon. Willamette spider mite prefers cooler climates and feeds by puncturing the plant leaf tissue; therefore removing plant nutrients in the …
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