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Precision Drought Stress In Orchards: Rootstock Evaluation, Trunk Hydration And Canopy Temperature, Lance V. Scott 2017 Utah State University

Precision Drought Stress In Orchards: Rootstock Evaluation, Trunk Hydration And Canopy Temperature, Lance V. Scott

All Graduate Theses and Dissertations

In many areas, over half of all diverted water is used for irrigation. Tree fruit crops use a lot of water, but water productivity can be increased using properly-timed precision water stress. In addition to water conservation, increases in water productivity arise from better fruit quality, increased storage life and reductions in pruning and maintenance. One major hurdle to applying precision water stress in orchards is the lack of a reliable, automated method of determining tree water status. However, the influence of physiological characteristics such as rootstock vigor on water productivity are also important. Selecting the most appropriate rootstocks and ...


Promising New Cherries, J. L. Budd 2017 Iowa Agricultural College

Promising New Cherries, J. L. Budd

Bulletin (Iowa Agricultural Experiment Station)

In the summer of 1882 the writer had a fine opportunity for studying the character of tree and fruit of the European cherries from the valley of the Moselle in East France, eastward to the Volga in Russia. In the spring of 1883 we imported one year old trees o f the varieties which we decided to be most promising for trial on the prairies of the Northwest. These trees were set in orchards and have had hard U 6 a g e , as they have been exposed to the recent test summers and winters, that have killed out the ...


Hardiness In The Apple As Correlated With Structure And Composition, S. A. Beach, F. W. Allen Jr. 2017 Iowa State College

Hardiness In The Apple As Correlated With Structure And Composition, S. A. Beach, F. W. Allen Jr.

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

The breeding of hardy apples is naturally such a long time proposition that it would be a distinct advantage if by microscopic examination of the wood, by mechanical tests, or by other observations the hardiness of a tree could be determined while it was still in the nursery, The following is a summary of the facts brought out in the investigation of "Hardiness in the Apple as Correlated with Structure and Composition. "

1. The cutting, compression and penetration tests seemed to indicate some correlation between hardiness and hardness, but exceptions were found.

2, Twigs from northern sections, except the forms ...


Exploration Of Chemical And Biological Management Strategies For Diaphorina Citri The Primary Vector Of Candidatus Liberibacter Asiaticus, Gretta Marie Sharp 2016 University of Texas at Tyler

Exploration Of Chemical And Biological Management Strategies For Diaphorina Citri The Primary Vector Of Candidatus Liberibacter Asiaticus, Gretta Marie Sharp

Biology Theses

Diaphorina citri (Hemipteran: Psyllidae), the Asian citrus psyllid, is a phloem-feeding, invasive species endemic to southern Asia that was first identified in the United States in Florida in 1998. Since introduction, D. citri has spread across the major citrus growing regions of the United States. This is of great concern to the citrus industry because D. citri is the primary vector of Candidatus Liberibacter asiaticus the causal agent of Haunglongbing (HLB). Haunglongbing is the most economically devastating disease of citrus causing an estimated 8.92 billion dollars lost in revenue and 4.62 billion dollars lost in gross domestic product ...


Impacts Of Biofumigation And Anaerobic Soil Disinfestation On Strawberry Production, Jennifer Renee’ Wheeler 2016 University of Tennessee - Knoxville

Impacts Of Biofumigation And Anaerobic Soil Disinfestation On Strawberry Production, Jennifer Renee’ Wheeler

Masters Theses

Due to the phase-out of methyl bromide, there is a need for alternative, nonchemical fumigation treatments in strawberry production. Anaerobic soil disinfestation and biofumigation are two non-chemical methods for controlling soilborne plant pathogens of strawberry. This study was designed to observe strawberry fruit nutrition and soil volatiles of a strawberry field being treated with biofumigation treatments, anaerobic soil disinfestation treatments, and a combination of the two alternative methods. A trial was conducted with 11 pre-plant soil-incorporated treatments arranged in a randomized complete block design with 6 rows (blocks). Biofumigation treatments consisted of deactivated mustard meal, deoiled mustard meal, mustard pellets ...


Genetic Determinism Of Xanthomonas Arboricola Pv. Pruni (Xap) Resistance, Fruit Quality, And Phenological Traits In Peach And Incorporation Of Marker-Assisted Selection (Mas) In The University Of Arkansas Peach And Nectarine Breeding Program, Terrence James Frett 2016 University of Arkansas, Fayetteville

Genetic Determinism Of Xanthomonas Arboricola Pv. Pruni (Xap) Resistance, Fruit Quality, And Phenological Traits In Peach And Incorporation Of Marker-Assisted Selection (Mas) In The University Of Arkansas Peach And Nectarine Breeding Program, Terrence James Frett

Theses and Dissertations

For over two decades the incorporation of marker-assisted selection (MAS) has been discussed as an innovative approach to increase peach breeding efficiency. Although hundreds of quantitative trait loci (QTLs) have been identified, only a few have been converted into usable MAS tools. This highlights a disconnect between genomic discoveries and practical application in breeding programs, which has delayed use of MAS.

In this dissertation, three sequential steps were performed with the objective to bridge this gap and develop breeding-relevant DNA tests for MAS of fruit bacterial spot resistance (Xap1 and Xap6), fruit quality [blush (Rf), acidity (D), and acidity and ...


Polyphenol Content And Differential Expression Of Flavonoid Biosynthetic Pathway Genes Of Fragaria Spp. With White Fruit, Sutapa Roy 2016 University of Kentucky

Polyphenol Content And Differential Expression Of Flavonoid Biosynthetic Pathway Genes Of Fragaria Spp. With White Fruit, Sutapa Roy

Theses and Dissertations--Plant and Soil Sciences

Strawberries are a rich source of polyphenols which contribute to berry color and plant disease resistance, and have been shown to lower the risk of many chronic when consumed. While a considerable body of work exists on the polyphenolic composition of commercial strawberry (Fragaria x ananassa Duch.), less information is available concerning polyphenols in Fragaria vesca, or Alpine strawberry, considered a model system for the Rosaceae family of crop species. The study of natural and genetically-engineered F. vesca mutants with white fruit can provide unique insight into regulation of metabolic flux through the complex branched phenylpropanoid/flavonoid biosynthetic pathway. Thus ...


Effects Of Tillage And Cover Crops On Muskmelon Production And Food Safety, John Krzton-Presson, Ajay Nair, Angela Shaw 2016 Iowa State University

Effects Of Tillage And Cover Crops On Muskmelon Production And Food Safety, John Krzton-Presson, Ajay Nair, Angela Shaw

Farm Progress Reports

Reduced tillage has been widely adopted in production of agronomic crops for its potential to improve soil health and reduce input costs. Despite this, vegetable growers largely rely on conventional tillage to incorporate crop residue, control weeds, and to prepare a seed bed for planting.


Evaluation Of Grafted And Nongrafted Hybrid And Heirloom Tomatoes In A Midwest High-Tunnel Production System, Kristine Neu, Ajay Nair 2016 Iowa State University

Evaluation Of Grafted And Nongrafted Hybrid And Heirloom Tomatoes In A Midwest High-Tunnel Production System, Kristine Neu, Ajay Nair

Farm Progress Reports

High tunnels have emerged as a tool for Iowa vegetable growers to extend the growing season, increase crop production, and improve quality of the produce, but production in this system does not come without challenges. Continuous cropping of tomatoes in the same high tunnel gives rise to recurring soil-borne and foliar diseases, pest pressure, issues with soil fertility and salinity, and increased irrigation requirements. One tool to overcome these challenges may be the use of vegetable grafting. The process of grafting is accomplished by attaching a desired scion onto a rootstock that is typically bred for vigor and/or disease ...


Evaluation Of Select Herbicides On Non-Bearing Crops, Diana Cochran 2016 Iowa State University

Evaluation Of Select Herbicides On Non-Bearing Crops, Diana Cochran

Farm Progress Reports

This study was conducted as part of the IR-4 Project to investigate herbicide phytotoxicity on two growth stages of shadblow serviceberry (Amelanchier canadensis), MalusGinger Gold apple (Malus × Ginger Gold), Spartan apple (Malus × Spartan), northern pecan (Carya illinoensis), Spanish chestnut (Castanea sativa), and Blackgold cherry (Prunus Blackgold).


Sixth Year Performance Of Honeycrisp Grafted On 31 Dwarfing Rootstocks Of The Nc-140regional Apple Rootstock Trial, Glen Rippke, Diana Cochran, Lynn Schroeder 2016 Iowa State University

Sixth Year Performance Of Honeycrisp Grafted On 31 Dwarfing Rootstocks Of The Nc-140regional Apple Rootstock Trial, Glen Rippke, Diana Cochran, Lynn Schroeder

Farm Progress Reports

Introduction Dwarfing rootstocks have the potential to increase profitability of tree-fruit growers by providing smaller trees suitable for high density plantings. Although the initial installation cost can be 10 to 30 times more than lower-density plantings, the long-range returns can far exceed the traditional plantings. However, to be viable as a commercial rootstock, dwarfing rootstocks must be adapted to a range of agro-climatic conditions, moderately disease resistant, high yielding, and produce quality fruit.


Bacterial Wilt Management In Muskmelonusing Perimeter Trap Cropping, Hayley Nelson, Mark Gleason 2016 Iowa State University

Bacterial Wilt Management In Muskmelonusing Perimeter Trap Cropping, Hayley Nelson, Mark Gleason

Farm Progress Reports

Spotted and striped cucumber beetles transmit bacterial wilt by feeding on infected plants. Bacterial wilt is devastating to cucurbit crops, especially muskmelon. Frequent applications of insecticides are the main form of control against cucumber beetles. Perimeter trap cropping (PTC) is a relatively new technique aimed at reducing insecticide sprays and the spread of bacterial wilt. PTC involves planting a border crop (usually 2 rows) that is highly attractive to beetles around a less attractive main crop. Cucumber beetles concentrate on the more attractive perimeter crop, and growers focus most of their insecticide applications on that limited area, reducing pesticide use.


Organic Practices For The Production Of Muskmelon, Hayley Nelson, Mark Gleason 2016 Iowa State University

Organic Practices For The Production Of Muskmelon, Hayley Nelson, Mark Gleason

Farm Progress Reports

Cucumber beetles provide a unique challenge to growers of muskmelon and other cucurbit crops in the Midwest. Spotted and striped cucumber beetles transmit bacterial wilt by feeding on infected plants. Beetles ingest the bacteria (Erwinia tracheiphila) and overwinter in soil. After emerging the following spring, beetles fly to nearby cucurbit crops to feed, continuing to spread bacterial wilt disease from plant to plant.


Vegetables, Fruits & Herbs Book, Utah State University 2016 Utah State University

Vegetables, Fruits & Herbs Book, Utah State University

All Current Publications

This book is a compilation of 58 researched-based fact sheets written and compiled by Utah State University faculty and students. For more gardening resources provided by USU Extension please visit our gardening website at garden.usu.edu.


Blackberry Virosome: A Micro And Macro Approach, Archana Khadgi 2015 University of Arkansas, Fayetteville

Blackberry Virosome: A Micro And Macro Approach, Archana Khadgi

Theses and Dissertations

Viruses pose a major concern for blackberry production around the world with more than 40 species known to infect the crop. Virus complexes have been identified recently as the major cause of plant decline with blackberry yellow vein disease (BYVD) being the most important disease of the crop in the Southern United States. The objective of this research was to study the blackberry virosome in both the macro and micro scale. The large scale approach involves identification of the major viruses known to be associated with BYVD in the Southern United States as well as the identification of other viruses ...


Applying Molecular And Phenotypic Tools To Characterize Flesh Texture And Acidity Traits In The Arkansas Peach Breeding Program And Understanding The Crispy Texture In The Arkansas Blackberry Breeding Program, Alejandra Andrea Salgado Rojas 2015 University of Arkansas, Fayetteville

Applying Molecular And Phenotypic Tools To Characterize Flesh Texture And Acidity Traits In The Arkansas Peach Breeding Program And Understanding The Crispy Texture In The Arkansas Blackberry Breeding Program, Alejandra Andrea Salgado Rojas

Theses and Dissertations

Quantitative trait loci (QTL) utilizing a pedigree-based analysis (PBA) approach was performed in the peach breeding program for the first time. The pedigree consisted of seven-F1 populations, their parents, ancestors, and cultivars. Flesh firmness and titratable acidity (TA) were examined in 2011, 2012, and 2013. For TA, a consistent and strong QTL was identified on the proximal end of linkage group (LG) 5 of the peach genome. For flesh firmness, two QTLs were located on LG 4. The first QTL was located on the chromosomal region where the slow-melting flesh (SMF) DNA test was identified, and the second QTL was ...


Available Nitrogen And Denitrification In Soil Altered By Ground Cover And Nutrient Source In An Organic Apple Orchard, Jade Nicole Ford 2015 University of Arkansas, Fayetteville

Available Nitrogen And Denitrification In Soil Altered By Ground Cover And Nutrient Source In An Organic Apple Orchard, Jade Nicole Ford

Theses and Dissertations

A shift in public demand towards more organic and locally produced fruit and vegetables has been occurring across the United States in recent years. A common practice in organic fruit production is the application of organic ground covers to supply nutrients while enhancing other soil properties. A need for research exists in the southern region of the U.S. examining the effects of regionally applicable ground cover and nutrient management on nitrogen availability and the microbial community to provide information to organic farmers in the region. Two studies were conducted to determine how 12 treatment combinations of four ground covers ...


The Enhancement Of Wild Bees (Hymenoptera: Apoidea) For Pollination Security, Eric M. Venturini 2015 University of Maine

The Enhancement Of Wild Bees (Hymenoptera: Apoidea) For Pollination Security, Eric M. Venturini

Electronic Theses and Dissertations

The acreage of pollinator-dependent crops continues to expand across the globe. Simultaneously, honey bee hives – an annually rented commodity that growers rely on – are more expensive every year and in some cases, scarce. In response, pollinator-dependent growers seek alternative pollinators. One approach is installing bee pasture on farms, a strategy that enables systems-based farmers to become in-situ farm-scale habitat managers. This thesis first presents a review of the literature on bee pasture plantings and provides a brief overview of some methods for assessing their impacts on the pollinator community. There are three major gaps in current bee pasture research. First ...


Mangiferin As A Biomarker For Mango Anthracnose Resistance, Herma Pierre 2015 Department of Earth and Environment

Mangiferin As A Biomarker For Mango Anthracnose Resistance, Herma Pierre

FIU Electronic Theses and Dissertations

Mangos (Mangifera indica L.) are tropical/subtropical fruits belonging to the plant family Anacardiaceae. Anthracnose is the most deleterious disease of mango both in the field and during postharvest handling. It is most commonly caused by the Colletotrichum gloeosporioides complex. Mangiferin, a xanthanoid compound found in at least twelve plant families worldwide (Luo et al., 2012), is present in large amounts of the leaves and edible mangos. Even though this compound plays a pivotal role in the plant’s defense against biotic and abiotic stressors, no correlations been made between the compound and mango anthracnose resistance.

Mangos were collected, grouped ...


Accessing Chilling Conditions For Perennial Fruit Crop Production In Kentucky, Yao Xue 2015 Western Kentucky University

Accessing Chilling Conditions For Perennial Fruit Crop Production In Kentucky, Yao Xue

Masters Theses & Specialist Projects

Temperate Region fruit and nut trees, and many other perennial plants, require cool winter temperatures (chilling hours) to ensure leaf and flower bud production in the following season. Temperate Regions are characterized by variable winter and spring temperatures. Failure of meeting sufficient chilling requirement results in deformed fruits, unequal maturation, and other plant deformities, thereby reducing quality and yields. Chilling requirements are expressed as number of accumulated hours within a range of approximately 32º to 45ºF or 0º to 7.2ºC. These requirements are specific for level of temperature, length of temperature period, and species and cultivar of plants. Information ...


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