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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 ...


The Effect Of Crown Gall Upon A Young Apple Orchard, Laurenz Greene, I. E. Melhus 2017 Iowa State College

The Effect Of Crown Gall Upon A Young Apple Orchard, Laurenz Greene, I. E. Melhus

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

This bulletin contains a record of progress in a study of the effect of crown gall upon an apple orchard from the time it is set out until it becomes of bearing age. The relative influence of various types of galls upon the annual growth of the trees has been considered and some data have been gathered on the amount and position of the galls in relation to the growth and percentage of stand in the orchard. Also, the susceptibility of certain kinds of apple trees to crown gall after they have been planted in the orchard, and the persistence ...


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 ...


Ne-1020 Cold-Hardy Wine Grape Cultivar Trial, Kenneth McCabe, Diana Cochran, Gail Nonnecke 2017 Iowa State University

Ne-1020 Cold-Hardy Wine Grape Cultivar Trial, Kenneth Mccabe, Diana Cochran, Gail Nonnecke

Farm Progress Reports

In conjunction with the Northeast Regional Research Project NE-1020 Multi-state Evaluation of Wine Grape Cultivars and Clones, Iowa State University (ISU) established a cold-hardy wine grape cultivar trial in 2008 at the ISU Horticulture Research Station (HRS), Ames, Iowa. The Iowa trial evaluates the performance of Corot Noir, La Crescent, Marquette, Petit Ami™ (planted in 2009), NY95.0301-01 (Arandell), MN1189, MN1200, MN1220, MN1235, MN1258, with Frontenac and St. Croix serving as control cultivars. Selection NY95.0300-01 (Aramella) was shipped by mistake and was planted in the guard rows and as end-of-row guard vines and Louise Swenson was used as replacement ...


Thornless Blackberry Cultivars Grown With A Rotatable Cross-Arm Trellis System, Gail Nonnecke, Sharon Tusiime, Leah Riesselman Worth, Bernie Havlovic 2017 Iowa State University

Thornless Blackberry Cultivars Grown With A Rotatable Cross-Arm Trellis System, Gail Nonnecke, Sharon Tusiime, Leah Riesselman Worth, Bernie Havlovic

Farm Progress Reports

Blackberries (Rubus L.) are a potential berry crop to diversify Iowa’s agricultural enterprises if plant injury caused by low temperatures is avoided. Winter temperatures below -13°F damage current commercial blackberry cultivars. Systems that improve winter survival of less-winter hardy, thornless blackberries have been used in other locations of eastern United States. The systems include using a rotating-arm trellis to lay blackberry canes near the soil surface to overwinter them under a row cover for protection. The rotatable arm trellis growing system also enhances management practices, such as pruning and training, harvesting, pest management, and proper air and sunlight ...


Cluster Removal On La Crescent And Leaf Removal On Marquette Grapevines, Kenneth McCabe, Diana Cochran, Gail Nonnecke 2017 Iowa State University

Cluster Removal On La Crescent And Leaf Removal On Marquette Grapevines, Kenneth Mccabe, Diana Cochran, Gail Nonnecke

Farm Progress Reports

As part of the Northern Grapes Project, research has evaluated various cultural practices to aid in understanding the performance of cold-hardy grape vines (Vitis vinefera-based hybrids) in cold climates. This multi-state research project has led to increased production of cold-hardy grapevines and consumer acceptance. Some cultural practices often utilized in viticulture throughout various parts of the world could potentially be implemented to increase performance and quality of grapes produced in the Midwest. Two of these cultural practices include leaf removal or canopy thinning, as well as fruit thinning or cluster removal. Both practices are typically aimed at improving fruit quality ...


Comparing Between-Row Mulchesin Organic Muskmelon And Squash—Year 1, Hayley Nelson, Mark Gleason 2017 Iowa State University

Comparing Between-Row Mulchesin Organic Muskmelon And Squash—Year 1, Hayley Nelson, Mark Gleason

Farm Progress Reports

Organic farmers must plan carefully to manage weeds and soil health. Mulching not only aids weed management, but also can improve soil quality. Organic-matter mulches compete with weeds for sunlight, moisture, nutrients, and growing space. They also improve soil health by reducing soil erosion and increasing soil organic matter. Organic matter contributes greatly to soil structure and microbial activity, both of which are essential to plant health.

The goal of this trial was to compare the effectiveness of two mulch treatments to suppress weeds, improve soil organic matter, and increase yields of organic muskmelon and acorn squash.


Effects Of Tillage And Cover Cropson Muskmelon Production And Food Safety, John Krzton-Presson, Ajay Nair, Angela Shaw 2017 Iowa State University

Effects Of Tillage And Cover Cropson 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 (CT) to incorporate crop residue, control weeds, and prepare a loose seed bed for planting. Conventional tillage may cause reduced water infiltration, lessen soil biodiversity, and increase nitrate leaching, erosion and weed germination. Strip-tillage (ST) only disturbs the soil in a 12-in. strip where the cash crop will be planted, leaving the rest of the field untilled.


Evaluation Of Peach And Nectarine Production In High Tunnel And Field Plots, Bryn Takle, Diana Cochran, Kenny McCabe 2017 Iowa State University

Evaluation Of Peach And Nectarine Production In High Tunnel And Field Plots, Bryn Takle, Diana Cochran, Kenny Mccabe

Farm Progress Reports

Peaches and nectarines are not common in Iowa’s commercial fruit production. Although the trees can survive -25°F when fully dormant, fruit buds are damaged at temperatures around 28°F, which often occur in Iowa due to spring frost events. The goal of this project is to test the economic viability of utilizing high tunnels to extend the season and enable these fruits to be grown reliably and successfully in Iowa.


Seventh Year Performance Of Honeycrisp Grafted On Dwarfing Rootstocks Of The Nc-140 Regional Apple Rootstock Trial, Bryn Takle, Diana Cochran, Lynn Schroeder 2017 Iowa State University

Seventh Year Performance Of Honeycrisp Grafted On Dwarfing Rootstocks Of The Nc-140 Regional Apple Rootstock Trial, Bryn Takle, Diana Cochran, Lynn Schroeder

Farm Progress Reports

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 greater 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.


Thornless Blackberry Cultivars Grown With A Rotatable Cross-Arm Trellis System, Gail Nonnecke, Sharon Tusiime, Leah Riesselman Worth, Bernie Havlovic 2017 Iowa State University

Thornless Blackberry Cultivars Grown With A Rotatable Cross-Arm Trellis System, Gail Nonnecke, Sharon Tusiime, Leah Riesselman Worth, Bernie Havlovic

Farm Progress Reports

Blackberries (Rubus L.) are a potential berry crop to diversify Iowa’s agricultural enterprises if plant injury caused by low temperatures is avoided. Winter temperatures below -13°F damage current commercial blackberry cultivars. Systems that improve winter survival of less-winter hardy, thornless blackberries have been used in other locations of eastern United States. The systems include using a rotating-arm trellis to lay blackberry canes near the soil surface to overwinter them under a row cover for protection. The rotatable arm trellis growing system also enhances management practices, such as pruning and training, harvesting, pest management, and proper air and sunlight ...


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 ...


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 ...


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 ...


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 ...


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.


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.


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 ...


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