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Articles 1 - 30 of 54
Full-Text Articles in Horticulture
Determining Colonization Efficacy Of Commercial Mycorrhizae Products And Fragaria X Anannassa ‘Albion’., Tommy Jue, Alexandra Wollenman
Determining Colonization Efficacy Of Commercial Mycorrhizae Products And Fragaria X Anannassa ‘Albion’., Tommy Jue, Alexandra Wollenman
Horticulture and Crop Science
No abstract provided.
The Effects Of Slow-Release Aluminum Sulfate On Bloom Color Of Hydrangea Macrophylla, Patrick James Edziak
The Effects Of Slow-Release Aluminum Sulfate On Bloom Color Of Hydrangea Macrophylla, Patrick James Edziak
Horticulture and Crop Science
Hydrangea macrophylla is a common greenhouse crop typically produced for the late winter and spring holidays. Most varieties are capable of producing either pink or blue flowers depending on aluminum content and pH of the growing medium. The goal of this experiment was to examine the effects of new controlled-release aluminum sulfate products on bloom color. This new product was applied as a topdress and a pre-plant incorporated mix using two different manufacturer recommended rates. Results were directly compared with those produced using a traditional water-soluble aluminum sulfate drench application. Controlled release aluminum sulfate was found to be at least …
Pacific Plug & Liner Crop Shrinkage Evaluation, Jillian Balli
Pacific Plug & Liner Crop Shrinkage Evaluation, Jillian Balli
Horticulture and Crop Science
Crop Shrinkage has a major impact on a company’s bottom line. There are many ways to combat shrinkage. This report focuses on shrinkage reduction by adjusting buffer planting numbers to reflect the actual number of plants lost in production. Inaccurate buffer can cause the cost of production to be inaccurate as well. This report evaluates crop shrinkage of a greenhouse located in Watsonville, CA called Pacific Plug & Liner.
Cultural And Environmental Factors Affecting The Production Of Dendranthema X Grandiflorum, Mary Rebecca Lacy
Cultural And Environmental Factors Affecting The Production Of Dendranthema X Grandiflorum, Mary Rebecca Lacy
Horticulture and Crop Science
The purpose of this experiment was to reduce the schedule of cut mum production by decreasing the number weeks of long days and supplementing the flowers with the plant hormone gibberellic acid (GA). GA is a plant hormone which enlarges the cells of the stems and could conceivably affect mum vegetative growth during long days. In this experiment, long days were reduced to 0, 3, 10, 13, 17 and 20. During the long day treatments, different rates of products were applied. Both ProGibb 4% and Fascination were used to look at the effects of the different variations of GA; GA …
A Feasibility Study On Possible Uses For A Common Area Greenbelt In A Southern California Neighborhood, Sarah J. Doherty
A Feasibility Study On Possible Uses For A Common Area Greenbelt In A Southern California Neighborhood, Sarah J. Doherty
Horticulture and Crop Science
Common greenbelt areas within residential neighborhoods are capable of existing as multi-function zones. ‘The Village’ in Southern Orange County, California, envisions its greenbelts as benefiting the homeowners, both in cost and esthetics, all beneficial insect and plant species, and the surrounding micro-climate. Research was conducted on three different systems, aimed at improving the areas of ‘The Village’ both economically and environmentally; the areas of focus were vineyard installation, fire resistant landscaping, and low impact development installations. The process began with evaluating the sites physical and judicial restraints. Soils tests, topography calculations, climate records, and preexisting species identifications were conducted; documents …
The History Of Trial Gardens, Hallie Schmidt
The History Of Trial Gardens, Hallie Schmidt
Horticulture and Crop Science
Essay explores the history of home gardening and seed industry in America and the conditions that led to the development of the All-America Selections.
Creation Of A Pamphlet On Young Tree Care, John G. Sanchez
Creation Of A Pamphlet On Young Tree Care, John G. Sanchez
Horticulture and Crop Science
No abstract provided.
Survey Of Suitable Plants For Cal Poly's Green Wall, Katrina Burritt
Survey Of Suitable Plants For Cal Poly's Green Wall, Katrina Burritt
Horticulture and Crop Science
Green wall technology is a growing industry in the United States and has been very successful for a several years throughout Europe. The objective of this survey was to study the success of several different species of plants on a vertical wall facing south at Cal Poly’s Horticultural Department Unit. At first the focus was aimed at using California native species, because it was thought that natives would be better acclimated to the exposure in this specific location. It became apparent that plants should not be selected for the wall based just on the fact that they are California natives. …
Landscape Design, Cost Estimate, And Management Plan, Garrett Talbot Williams
Landscape Design, Cost Estimate, And Management Plan, Garrett Talbot Williams
Horticulture and Crop Science
The purpose of this project is to evolve a bleak landscape into something that the home owner can appreciate and love. This project will demonstrate the knowledge of this process to provide as a guide for others. This project gives an overview of all aspects of a landscape project including: drawings of an irrigation layout, planting plan, drainage plan, and a construction plan. This project takes place in Riverbank, California, which is located in the Central Valley. The property’s main centerpiece is a pool and adjacent waterfall. However, the landscape currently surrounding the pool is very bare and lacks aesthetic …
High School Horticulture Curriculum, Margaret Maratsos
High School Horticulture Curriculum, Margaret Maratsos
Horticulture and Crop Science
Horticulture is just one of the many topics covered in a high school agriculture curriculum, and yet, there are very few lesson plans or resources available to teachers for these classes specifically. The objectives of this project were to compile a set of lesson plans, lab plans, and tests that would emphasize interactive and investigative learning. The lesson plans were written in such a way that they reflected a certain set of standards, set down by the state of California, and were meant to serve as a bare outline of topics that would be discussed within a week’s worth of …
Response Of Evergreen Perennial Tree Crops To Gibberellic Acid Is Crop Load-Dependent: Ii. Ga3 Increases Yield And Fruit Size Of ‘Hass’ Avocado Only In The On-Crop Year Of An Alternate Bearing Orchard, Lauren C. Garner, Grant Klein, Yusheng Zheng, Toan Khuong, Carol J. Lovatt
Response Of Evergreen Perennial Tree Crops To Gibberellic Acid Is Crop Load-Dependent: Ii. Ga3 Increases Yield And Fruit Size Of ‘Hass’ Avocado Only In The On-Crop Year Of An Alternate Bearing Orchard, Lauren C. Garner, Grant Klein, Yusheng Zheng, Toan Khuong, Carol J. Lovatt
Horticulture and Crop Science
Despite problems of low fruit set, small fruit size and alternate bearing, the Hass cultivar dominates commercial avocado production worldwide. To increase yield and fruit size, gibberellic acid (GA3) (25 mg L−1) was applied at different stages of ‘Hass’ avocado tree phenology: (i) mid–late April (flower abscission), end of June–beginning of July (fruit abscission and beginning of the exponential phase of fruit growth), and mid-January (beginning of pre-harvest fruit drop); (ii) end of June–beginning of July; and (iii) mid-September (near the end of the major fruit abscission period; period of …
Temperature Thresholds And Degree-Day Model For Marmara Gulosa (Lepidoptera: Gracillariidae), M. J. O'Neal, David H. Headrick, Gregory H. Montez, E.E. Grafton-Cardwell
Temperature Thresholds And Degree-Day Model For Marmara Gulosa (Lepidoptera: Gracillariidae), M. J. O'Neal, David H. Headrick, Gregory H. Montez, E.E. Grafton-Cardwell
Horticulture and Crop Science
The developmental thresholds for Marmara gulosa Guillen & Davis (Lepidoptera: Gracillariidae) were investigated in the laboratory by using 17, 21, 25, 29, and 33°C. The lowest mortality occurred in cohorts exposed to 25 and 29°C. Other temperatures caused >10% mortality primarily in egg and Þrst and second instar sap-feeding larvae. Linear regression analysis approximated the lower developmental threshold at 12.2°C. High mortality and slow developmental rate at 33°C indicate the upper developmental threshold is near this temperature. The degree-day (DD) model indicated that a generation requires an accumulation of 322 DD for development from egg to adult emergence. Average daily …
Digital Mapping As A Student And Staff Communication Tool, Ryan Gyurkovitz
Digital Mapping As A Student And Staff Communication Tool, Ryan Gyurkovitz
Horticulture and Crop Science
A study in the use of Geographic Information Systems in the development of digital maps for use by students and staff in Plant Identification Courses.
Meeting Learning Objectives Through Service-Learning: A Pomology Case Study, Lauren C. Garner
Meeting Learning Objectives Through Service-Learning: A Pomology Case Study, Lauren C. Garner
Horticulture and Crop Science
Undergraduate students enrolled in the introductory pomology course at California Polytechnic State University, San Luis Obispo, CA, from 2007 to 2010, participated in a service-learning project. Students helped the community organization, the California Rare Fruit Growers (CRFG), teach grafting skills to San Louis Obispo County high school students and community members. At the end of each quarter, pomology students completed evaluations of their experience. Results of these evaluations were used to improve teaching methodology and the experience in which the students participated. Self-reported and instructor evaluations of the service-learning project demonstrated that students increased their grafting knowledge and skills, their …
The Use Of Horticulture And Gardening As A Special Education Tool At The High School Level, Krysta Marie Johnson
The Use Of Horticulture And Gardening As A Special Education Tool At The High School Level, Krysta Marie Johnson
Horticulture and Crop Science
THIS REPORT CONTAINS PLANNING METHODS AND INSTALLATION PROCEDURE FOR A RAISED VEGETABLE GARDEN FOR WILSONVILLE HIGH SCHOOL, IN WILSONVILLE, OREGON. THE PRIMARY PURPOSE OF THE GARDEN WAS TO USE IT AS A LEARNING TOOL FOR THE SPECIAL EDUCATION DEPARTMENT AT WILSONVILLE HIGH SCHOOL. UPON DOING MORE RESEARCH IT BECAME EVIDENT THAT THE GARDEN CAN ALSO BE USED AS A HEALING TOOL FOR STUDENTS WHO SUFFER FROM ATTENTION DISORDERS AND WHO HAVE EMOTIONAL AND LEARNING DISABILITIES. THE STUDENTS HAVE BECOME INVESTED IN THE GARDEN PROJECT AND LOOK FORWARD TO DOING MORE PROJECTS WITH THEIR CLASS.
Overall Growth Of Tomato (Lycopersicon Esculentum L. Cv. Glacier) Inoculated With Species Of Glomus And Trichoderma Growing Under Greenhouse Conditions, Brian J. Adkins
Overall Growth Of Tomato (Lycopersicon Esculentum L. Cv. Glacier) Inoculated With Species Of Glomus And Trichoderma Growing Under Greenhouse Conditions, Brian J. Adkins
Horticulture and Crop Science
The overall plant growth of tomato (Lycopersicon esculentum L. cv. Glacier) cultivated in greenhouse conditions along with inoculation treatments of beneficial fungi species were observed. This study included 2 brand name products containing species of fungi which include: 1)Botanicare Guardian TR containing Trichoderma harzianum 10,000,000 CFU/g, T. hamatum 10,000,000 CFU/g, T. koningii 10,000,000 CFU/g; and 2)Botanicare Guardian MY containing Glomus intraradices 57 propagules/g;G. fasiculatum 57 propagules/g; G. etunicatum 57 propagules/g; G. clarum 57 propagules/g. Treatments include: Treatments: 1) 2g Botanicare Guardian TR; 2) 2g Botanicare Guardian MY; 3) 1g Botanicare Guardian TR + 1g Botanicare Guardian MY; and …
The Designing, Installing, And Maintaining Of A Hydroponic Nft System For Commercial Production Of Lactuca Sativa Under Greenhouse Environment Conditions, Alec C. Mayall
Horticulture and Crop Science
Commercial hydroponic vegetable production is on the rise all over the world, especially in regions where people are increasingly health conscientious, yields and quality are important, or traditional farming is impossible as in regions with non-arable lands. Hydroponics is a powerful tool for vegetable production; however, it does have technological challenges and cost barriers. This project explored the practicality of designing, installing, and maintaining a commercial hydroponic Nutrient Film Technique lettuce production system under greenhouse environmental growing conditions. A medium scale system was designed and installed in a greenhouse and then the growth stages and the scheduling of lettuce for …
Biology And Parasitism Rates Of Pteromalus Nr. Myopitae (Hymenoptera: Pteromalidae), A Newly Discovered Parasitoid Of Olive Fruit Fly Bactrocera Oleae (Diptera: Tephritidae) In Coastal California, Therese Kapaun, Hannah Nadel, David H. Headrick, Larisa Vredevoe
Biology And Parasitism Rates Of Pteromalus Nr. Myopitae (Hymenoptera: Pteromalidae), A Newly Discovered Parasitoid Of Olive Fruit Fly Bactrocera Oleae (Diptera: Tephritidae) In Coastal California, Therese Kapaun, Hannah Nadel, David H. Headrick, Larisa Vredevoe
Horticulture and Crop Science
An undescribed wasp, Pteromalus nr. myopitae (Hymenoptera: Pteromalidae) opportunistically parasitizes the olive fruit fly Bactrocera oleae (Rossi) (Diptera: Tephritidae), an introduced pest of olives in California. The native or typical host of P. nr. myopitae is unknown. We demonstrate that P. nr. myopitae is a solitary, ectoparasitic, idiobiont parasitoid of the third instar host inside fruit, and pupation occurs in the host tunnel. Reproduction of P. nr. myopitae on B. oleae in olives in the laboratory and in field cages generally failed. Host-feeding was not observed, and adults fed honey and water lived longer than those provided with water alone. …
Novel Lepidopteran Sex Pheromone Components From Marmara Gulosa (Lepidoptera: Gracillariidae), J. Stephen Mcelfresh, Jardel A. Moreira, Elizabeth E. Grafton-Cardwell, David H. Headrick, John M. Heraty, Marta Guillen, Jocelyn G. Millar
Novel Lepidopteran Sex Pheromone Components From Marmara Gulosa (Lepidoptera: Gracillariidae), J. Stephen Mcelfresh, Jardel A. Moreira, Elizabeth E. Grafton-Cardwell, David H. Headrick, John M. Heraty, Marta Guillen, Jocelyn G. Millar
Horticulture and Crop Science
Marmara gulosa Guillén & Davis (Lepidoptera: Gracillariidae) is a sporadic pest of citrus and a number of other crops in southern and central California. Coupled gas chromatographic-electroantennogram detection analyses of headspace volatiles collected by solid phase microextraction from virgin female moths revealed at least four related compounds in the extracts that elicited significant antennal responses from antennae of male moths. These compounds were identified as (8E,10E)-tetradecadien-1-ol, and the corresponding aldehyde, acetate, and formate ester, representing the first report of a formate as a lepidopteran pheromone component. The four compounds were consistently found in headspace volatiles collected …
Regulated Deficit Irrigation And Density Of Erythroneura Spp. (Hemiptera: Cicadellidae) On Grape, Michael J. Costello
Regulated Deficit Irrigation And Density Of Erythroneura Spp. (Hemiptera: Cicadellidae) On Grape, Michael J. Costello
Horticulture and Crop Science
This study looked at regulated deficit irrigation (RDI) on leafhoppers in the genus Erythroneura (Erythroneura elegantula Osborn, or western grape leafhopper, and Erythroneura variabilis Beamer) (Hemiptera: Cicadellidae), which are serious pests of cultivated grape (Vitis vinifera L.) in California. RDI is an irrigation strategy that reduces irrigation during a critical point in the phenology of a cultivated perennial crop, to improve vegetative balance and crop quality. Erythroneura spp. are known to respond negatively to vine water stress, and the second generation of leafhoppers begins during a potential RDI initiation period, between berry set and veraison (beginning of fruit …
Impact Of Sulfur On Density Of Tetranychus Pacificus (Acari: Tetranychidae) And Galendromus Occidentalis (Acari: Phytoseiidae) In A Central California Vineyard, Michael J. Costello
Impact Of Sulfur On Density Of Tetranychus Pacificus (Acari: Tetranychidae) And Galendromus Occidentalis (Acari: Phytoseiidae) In A Central California Vineyard, Michael J. Costello
Horticulture and Crop Science
Sulfur is the oldest and most widely used fungicide in the vineyards of California, where it is used for control of powdery mildew (Uncinula necator [Schw.] Burr). For decades, sulfur use has been associated with outbreaks of Tetranychus pacificus McGregor (Acari: Tetranychidae) on cultivated grapes in the San Joaquin Valley. I undertook large-scale field studies to test this association, to evaluate the impact of sulfur on Galendromus occidentalis (Nesbit) (Acari: Phytoseiidae), a major predator of T. pacificus, and to determine if timing of sulfur applications with respect to grape bloom has an impact on T. pacificus density. The …
Spontaneous Hybridization Between Maize And Teosinte, Norman C. Ellstrand, Lauren C. Garner, Subray Hedge, Roberto Guadagnuolo, Lesley Blancas
Spontaneous Hybridization Between Maize And Teosinte, Norman C. Ellstrand, Lauren C. Garner, Subray Hedge, Roberto Guadagnuolo, Lesley Blancas
Horticulture and Crop Science
The closest wild relatives of maize, Zea mays ssp. mays are various Zea taxa known as ‘‘teosinte.’’ Hybrids between maize and the teosinte taxon, Zea mays ssp. mexicana, often occur when the 2 are sympatric in Mexico. Measuring the spontaneous hybridization rate of the 2 taxa would shed light on the mechanisms contributing to the evolution and persistence of these hybrid swarms. We conducted a series of field experiments in Riverside, CA, to measure the natural hybridization rates between maize and 2 teosinte taxa, Z. m. ssp. mexicana and Zea mays ssp. parviglumis. We planted teosinte within and …
Day Vs. Night Sampling For Spiders In Grape Vineyards, Michael J. Costello, Kent M. Daane
Day Vs. Night Sampling For Spiders In Grape Vineyards, Michael J. Costello, Kent M. Daane
Horticulture and Crop Science
We compared day sampling (between 0700 and 1100) and night sampling (between 1900 and 2300) of spiders on grapevines in a California vineyard in 1993 and 1994, shaking spiders from the vines onto a drop cloth and vacuuming them up. Pooled density of the seven most abundant spider species did not differ significantly between day and night sampling, nor did density of Cheiracanthium inclusum (Miturgidae), Trachelas pacificus (Corrinidae), Oxyopes spp. (Oxyopidae) or Neoscona oaxacensis (Araneidae). Under day sampling Metaphidippus vitis (Salticidae) was 60% more abundant and Hololena nedra (Agelenidae) more than 2.5 fold more abundant than under night sampling. Daytime …
Spider And Leafhopper (Erythroneura Spp.) Response To Vineyard Ground Cover, Michael J. Costello, Kent M. Daane
Spider And Leafhopper (Erythroneura Spp.) Response To Vineyard Ground Cover, Michael J. Costello, Kent M. Daane
Horticulture and Crop Science
Ground cover is used in some vineyards to improve soil structure and help manage insect pests; previous studies have shown lower leafhopper (Erythroneura spp.) densities on vines grown with ground cover. We undertook a 2-yr study to determine why ground cover is associated with reduced leafhopper densities. Ground cover consisted of a fall-planted cover crop of purple vetch (Vicia benghalensis) and barley (Hordeum vulgare), which senesced in May and was replaced by a complex of resident vegetation comprised primarily of the grasses Echinochloa spp., Digitaria sanguinalis, and Setaria spp., as well as common knotweed …
Biological Control As A Tool For Ecosystem Management, David H. Headrick, Richard D. Goeden
Biological Control As A Tool For Ecosystem Management, David H. Headrick, Richard D. Goeden
Horticulture and Crop Science
Biological control is proposed as a tool useful for ecosystem management and compatible with the goals of often competing interests regarding the restoration and maintenance of ecosystems. We summarize the effects of introduced species on ecosystems in three broad groups: insects, vertebrates, and weeds. We then discuss the role of biological control for each of these groups in the context of ecosystem management and realistic outcomes. Of the three groups, we show that biological control of weeds appears to have the best chance for success in ecosystem management. We provide two case studies to support our ideas and finally discuss …
Fork-Tailed Katydid Studies, David H. Headrick
Fork-Tailed Katydid Studies, David H. Headrick
Horticulture and Crop Science
The fork-tailed katydid, Scudderia furcata Brunner (Orthoptera: Tettigoniidae) was considered a minor pest of citrus in California, but in the last few years has increasingly become a problem due to reduction in organophosphate and carbamate pesticides (Grafton-Cardwell 1999). Our objective is to study the biology and behavior of the fork-tailed katydid as a pest of commercially grown citrus in order to develop ecologically-based control methods for application in commercial citrus production.
Development And Reproduction Of A Population Of Eretmocerus Eremicus (Hymenoptera: Aphelinidae) On Bemisia Argentifolii (Homoptera: Aleyrodidae), David H. Headrick, Thomas S. Bellows, Jr., Thomas M. Perring
Development And Reproduction Of A Population Of Eretmocerus Eremicus (Hymenoptera: Aphelinidae) On Bemisia Argentifolii (Homoptera: Aleyrodidae), David H. Headrick, Thomas S. Bellows, Jr., Thomas M. Perring
Horticulture and Crop Science
Although the aphelinid parasitoid Eretmocerus eremicus Rose & Zolnerowich is the most abundant naturally occurring parasitoid of Bemisia argentifolii Bellows & Perring in the U.S. desert southwest, its effectiveness in different cropping systems varies. Development and reproduction of a population of this parasitoid attacking B. argentifolii infesting cotton, Gossypium hirsutum L., and sweet potato, Ipomoea batatas L., were quantified and compared. Females potato; there were no significant differences of these parameters between host plant species. A preoviposition period of 0.61 d was recorded, and a maximum number of eggs laid in a day was 69 on cotton and 13 on …
Reproductive Biology And Search Behavior Of Amitus Bennetti (Hymenoptera: Platygasteridae), A Parasitoid Of Bemisia Argentifolii (Homoptera: Aleyrodidae), Andrea L. Joyce, Thomas S. Bellows, Jr., David H. Headrick
Reproductive Biology And Search Behavior Of Amitus Bennetti (Hymenoptera: Platygasteridae), A Parasitoid Of Bemisia Argentifolii (Homoptera: Aleyrodidae), Andrea L. Joyce, Thomas S. Bellows, Jr., David H. Headrick
Horticulture and Crop Science
No abstract provided.
Abundance Of Spiders And Insect Predators On Grapes In Central California, Michael J. Costello, Kent M. Daane
Abundance Of Spiders And Insect Predators On Grapes In Central California, Michael J. Costello, Kent M. Daane
Horticulture and Crop Science
We compared the abundance of spiders and predaceous insects in five central California vineyards. Spiders constituted 98.1% of all predators collected. More than 90% of all spiders collected were from eight species of spiders, representing six families. Two theridiids (Theridion dilutum and T. melanurum) were the most abundant, followed by a miturgid (Cheiracanthium inclusum) and an agelinid (Hololena nedra). Predaceous insects comprised 1.6% of all predators collected, and were represented by six genera in five families. Nabis americoferis (Heteroptera, Nabidae) was the most common predaceous insect, with its densities highest late in the growing …
Can Cover Crops Reduce Leafhopper Abundance In Vineyards?, Kent M. Daane, Michael J. Costello
Can Cover Crops Reduce Leafhopper Abundance In Vineyards?, Kent M. Daane, Michael J. Costello
Horticulture and Crop Science
In 3 of 4 vineyards we studied, late-season leafhopper density was lower on vines in cover cropped plots than in plots with no cover crops. However, the level of leafhopper reduction (about 15%) was rarely economically important and the mechanisms leading to reduction were not clear. For example, there were few differences in the number of leaf hopper predators or parasitoids on the vines in cover cropped versus no cover plots. However, there were significant between-treatment differences in vine growth. Plots with seasonwide maintenance of a cover crop and resident grasses had a reduction in vine vigor. Lower vine vigor …