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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.


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 ...


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 ...


Combined Effects Of Fertilizer, Irrigation, And Paclobutrazol On Yield And Fruit Quality Of Mango, Babul C. Sarker, Mohammad A. Rahim, Douglas D. Archbold 2016 Bangladesh Agricultural Research Institute, Bangladesh

Combined Effects Of Fertilizer, Irrigation, And Paclobutrazol On Yield And Fruit Quality Of Mango, Babul C. Sarker, Mohammad A. Rahim, Douglas D. Archbold

Horticulture Faculty Publications

Combinations of fertilizer rates, foliar N sprays, irrigation practices, and paclobutrazol were studied to determine how much they could alter and/or improve mango (Mangifera indica L.) growth, flowering, and yield. Two treatment combinations derived from several years of prior studies of individual practices were compared: one combination was comprised of the best (BT) individual practices from the prior studies and included three applications of fertilizer, a 4% KNO3 spray application before flowering, paclobutrazol at 7.5 g/L, and weekly irrigation, and the other combination was comprised of the next best (NB) individual practices including two applications of ...


Particular Applications Of Food Irradiation Fresh Produce, Anuradha Prakash 2016 Chapman University

Particular Applications Of Food Irradiation Fresh Produce, Anuradha Prakash

Food Science Faculty Articles and Research

On fresh fruits and vegetables, irradiation at low and medium dose levels can effectively reduce microbial counts which can enhance safety, inhibit sprouting to extend shelf-life, and eliminate or sterilize insect pests which can serve to facilitate trade between countries. At the dose levels used for these purposes, the impact on quality is negligible. Despite the fact that regulations in many countries allow the use of irradiation for fresh produce, the technology remains under-utilized, even in the light of an increase in produce related disease outbreaks and the economic benefits of extended shelflife and reduced food waste. Putative concerns about ...


Acetylcholinesterase Inhibition By Nootkatone And Carvacrol In Arthropods, Jennifer A. Anderson, Joel R. Coats 2016 Iowa State University

Acetylcholinesterase Inhibition By Nootkatone And Carvacrol In Arthropods, Jennifer A. Anderson, Joel R. Coats

Joel R. Coats

The essential oils from many botanicals have been screened for insecticidal activity. Two constituents of the Alaskan yellow cedar tree, the monoterpenoid carvacrol and the sesquiterpenoid nootkatone, both are toxic against several arthropods. The mode of action through which nootkatone and carvacrol exert their insecticidal activity remains uncertain. It has been hypothesized that they may inhibit acetylcholinesterase enzyme activity. The degree of acetylcholinesterase inhibition of carvacrol and nootkatone was compared to that of carbaryl, a known acetylcholinesterase inhibitor, in the house fly (Musca domestica), yellow fever mosquito (Aedes aegypti), American dog tick (Dermacentor variabilis) and American cockroach (Periplaneta americana). The ...


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 ...


Investigating Novel Approaches For The Integrated Control Of The Soilborne Strawberry Pathogens Macrophomina Phaseolina And Fusarium Oxysporum F. Sp. Fragariae, Mel Carter 2016 California Polytechnic State University, San Luis Obispo

Investigating Novel Approaches For The Integrated Control Of The Soilborne Strawberry Pathogens Macrophomina Phaseolina And Fusarium Oxysporum F. Sp. Fragariae, Mel Carter

Master's Theses and Project Reports

Macrophomina phaseolina (Mp) and Fusarium oxysporum f. sp. fragariae (Fof) are emerging soilborne pathogens causing crown rot and Fusarium wilt, respectively, in commercial strawberry production in California. Fungicides representing eight active ingredients from four different mode of action groups (FRAC groups 1, 3, 7 and 12) were evaluated for their efficacy against each pathogen in vitro and each disease in planta. Fungicide active ingredients were evaluated for their ability to inhibit mycelial growth of both pathogens in vitro. Half-strength potato dextrose agar was amended with six different concentrations (0.01, 0.1, 1.0, 5.0, 10, 50 µg a ...


Assessing Consumers' Valuation Of Cosmetically Damaged Apples Using A Mixed Probit Model, Chengyan Yue, Helen H. Jensen, Daren S. Mueller, Gail R. Nonnecke, Mark L. Gleason 2016 Iowa State University

Assessing Consumers' Valuation Of Cosmetically Damaged Apples Using A Mixed Probit Model, Chengyan Yue, Helen H. Jensen, Daren S. Mueller, Gail R. Nonnecke, Mark L. Gleason

Helen Jensen

A mixed probit model was applied to survey data to analyzeconsumers’willingnessto buy apples with cosmetic damage caused by the sooty blotch and flyspeck (SBFS) disease complex. The analysis finds consumers will pay a premium for organic production methods and for apples with low amounts of SBFS damage. Behavioral variables such as experience in growing fruit significantly affect the willingness to buy applesofdifferentdamagelevels.Consumers’toleranceofveryblemishedapplesis limited and they trade off production technology attributes for cosmetic appearance. Better understanding of this trade-offisimportanttoorganicproducers’decisionsabout disease control.


Changes In Oxidative Patterns During Dormancy Break By Warm And Cold Stratification In Seeds Of An Edible Fruit Tree, Dilinuer Shalimu, Jia Sun, Carol C. Baskin, Jerry M. Baskin, Liwei Sun, Yujun Liu 2016 Beijing Forestry University, China

Changes In Oxidative Patterns During Dormancy Break By Warm And Cold Stratification In Seeds Of An Edible Fruit Tree, Dilinuer Shalimu, Jia Sun, Carol C. Baskin, Jerry M. Baskin, Liwei Sun, Yujun Liu

Biology Faculty Publications

The transition from seed dormancy to germination is triggered by environmental factors, and in pomegranate (Punica granatum) seeds higher germination percentages are achieved by warm + cold stratification rather than by cold stratification alone. Our objective was to define the pattern of internal oxidative changes in pomegranate seeds as dormancy was being broken by warm + cold stratification and by cold stratification alone. Embryos isolated from seeds after 1–42 days of warm stratification, after 56 days of warm stratification + 7, 28 or 56 days of cold stratification, and after 1–84 days of cold stratification alone, were used in biochemical tests ...


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 ...


Screening Strawberry Clones For Anthracnose Disease Resistance Using Traditional Techniques And Molecular Markers, Melinda A. Miller-Butler 2016 University of Southern Mississippi

Screening Strawberry Clones For Anthracnose Disease Resistance Using Traditional Techniques And Molecular Markers, Melinda A. Miller-Butler

Dissertations

Cultivated strawberry, Fragaria x ananassa Duchesne, is host for many pathogens. One of the most destructive diseases of strawberry is anthracnose, whose symptoms include fruit rot, leaf and petiole lesions, crown rot, wilt, and death. Three species of Colletotrichum are considered causative agents of anthracnose diseases of strawberry. Colletotrichum acutatum causes anthracnose fruit rot, has a broad host range, and occurs in most areas of the world where strawberries are grown. Colletotrichum fragariae, the primary causal fungus of anthracnose crown rot, may infect all aboveground parts of the strawberry plant, and has restricted host and geographic ranges. Colletotrichum gloeosporioides causes ...


Comparative Evaluation Of The Effect Of Methyl Bromide Fumigation And Phytosanitary Irradiation On The Quality Of Fresh Strawberries, Tamar Serapian, Anuradha Prakash 2016 Chapman University

Comparative Evaluation Of The Effect Of Methyl Bromide Fumigation And Phytosanitary Irradiation On The Quality Of Fresh Strawberries, Tamar Serapian, Anuradha Prakash

Food Science Faculty Articles and Research

Fresh strawberries are highly perishable and have a short shelf-life especially when the cold chain is not maintained. Strawberries exported to Asia are currently fumigated with methyl bromide for phytosanitary purposes, which exposes strawberries to warm temperatures for several hours and air freight without temperature control, resulting in a shelf life of just a few days in the destination country. Irradiation offers an efficacious alternative to fumigation and can be performed on cold fruit. This study was conducted to compare the quality of strawberries subject to methyl bromide fumigation or irradiation followed by simulated commercial air freight shipment of strawberries ...


Propagating Jujubes, Rachelle Johnstone 2016 Department of Agriculture and Food, Western Australia

Propagating Jujubes, Rachelle Johnstone

Research Reports

Jujubes can be propagated by various methods such as wedge/cleft grafting, whip grafting and bark grafting as well as budding. Local propagators have better success with budding but find that wedge grafting leads to a stronger tree. Most of the latest research into propagation is in micropropagation and tissue culture however this technique is mainly used for research and breeding new cultivars and not in a commercial capacity. Grafting can be more of an art than a science. Much of the success of grafting depends on not only performing a technically correct graft but performing the graft at the ...


The Effects Of Shade On Primocane Fruiting Blackberries In The Field, Olivia C. Caillouet, Curt C. Rom, Jason McAfee, Luke Freeman, Heather Friedrich 2016 University of Arkansas, Fayetteville

The Effects Of Shade On Primocane Fruiting Blackberries In The Field, Olivia C. Caillouet, Curt C. Rom, Jason Mcafee, Luke Freeman, Heather Friedrich

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Primocane fruiting blackberry production in Arkansas is limited by heat during the flowering and early fruiting season. Shade could be used to delay flowering and fruiting to more favorable growth period. This study was designed to test three levels of shade (0% [control], 30% and 50% shading) applied at three times during the growing season that examined the growth, development, physiology of flowering, and fruiting of ‘Prime-Ark® 45’ blackberries. The seven treatments were as follows: 1) an untreated control (CK), 2) early shade 30% (ES30), mid shade 30% (MS30), 4) late shade 30% (LS30), 5) early shade 50% (ES50), 6 ...


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