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Dissertations / Theses on the topic 'Pests of alfalfa'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Ottman, Michael J. "Nondormant Alfalfa Varieties for Arizona 2013." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2013. http://hdl.handle.net/10150/305087.

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Ottman, Michael. "Nondormant Alfalfa Varieties for Arizona 2008." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2008. http://hdl.handle.net/10150/146995.

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2 pp.<br>Nondormant alfalfa varieties are adapted to mild winter areas in Arizona. An alfalfa variety should be selected based on dormancy class, potential pest problems, university yield trials, and on-farm tests. This publication contains pest resistance ratings and a summary of University of Arizona yield trials for nondormant alfalfa varieties.

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3

Ottman, Michael J. "Nondormant Alfalfa Varieties for Arizona 2012." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011. http://hdl.handle.net/10150/225856.

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4

Mazahery-Laghab, Hojjatollah. "Endogenous resistance to insect pests in alfalfa : engineering for enhanced resistance." Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4695/.

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Alfalfa (Medicago sativa) is a valuable forage crop grown throughout the World. While the crop is resistant to attack by many insect pests, it is subject to potentially severe losses through the action of several specific pests, which are adapted to alfalfa as a host. The most economically damaging of these pests is the alfalfa weevil, Hypera postica. This thesis investigates the endogenous defences of alfalfa against insects, which are responsible for its resistance to non-pest species, and develops a strategy for increasing the resistance of alfalfa towards pest species, specifically alfalfa

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5

Madhusudhan, Vaadiyar V. "Interaction of the spotted alfalfa aphid and its food plant." Title page, contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phm1812.pdf.

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6

Rethwisch, Michael D., Lois Berger, Bradford J. Griffin, A. Bradley, Mark Reay, and J. E. Nelson. "Insecticidal control of late winter/spring alfalfa pests in the Palo Verde Valley, 2001." College of Agriculture, University of Arizona (Tucson, AZ), 2002. http://hdl.handle.net/10150/203853.

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Fifteen insecticide treatments were applied March 12, 2001, to compare their efficacies on alfalfa weevils, western flower thrips, blue alfalfa aphids and associated aphid predators. Furadan and insecticides containing a pyrethroid active ingredient reduced alfalfa weevil larvae by more than 89% when compared with the untreated check. All treatments provided a minimum of 70% control of blue alfalfa aphids by seven days post treatment, with fewest aphids noted in WarriorT insecticide treatments. Although some insecticides reduced adult western flower thrips number initially, adult thrips increa

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7

Goosey, Hayes Blake. "A degree day model of sheep grazing influence on alfalfa weevil, Hypera postica." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/goosey/GooseyH1209.pdf.

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Alfalfa, Medicago sativa (L.), is produced on approximately 720,000 ha in Montana and is the foremost forage crop in many high, semiarid, intermountain states. Two biological stressors (insects and weeds) combined with poor field management are primarily responsible for reduced alfalfa production. In the U.S. alone, arthropods cause an estimated $260 million loss to alfalfa with the alfalfa weevil (AW), Hypera postica Gyllenhal, being the most damaging phytophagous pest in the United States. Using degree days as predictors for initiation and cessation of arthropod IPM programs is a common prac

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8

Luna, John. "Development, implementation, and economic evaluation of an integrated pest management program for alfalfa in Virginia." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49827.

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9

Cotty, Susanne. "Determining the Economic Damaging Level of the Egyptian Alfalfa Weevil Hypera brunneipennis (Bohemian)." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/200480.

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An experiment was conducted to ascertain the population level of Egyptian alfalfa weevil Hvpera brunneipennis (EAW) at which chemical control becomes economically justified. Four treatments were established by applying malathion at 1 lb. a.i./acre when an average of 5,10,15, or 20 weevil larvae were found per five sweeps; one treatment was sprayed every week (0 larvae) and the controls received no chemical treatment. Five 180- degree sweeps were taken weekly in each plot with a standard 15 -inch net and net contents were emptied into a white plate for counting. EAW larvae and adults were count

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10

Nigh, Edward Jr, and Lester Dawson. "The Stateus of Stem Nematodes in Arizona Alfalfa in 1985-86." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/200534.

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Alfalfa stem nematodes have become a more serious pest since the advent of non -dormant alfalfa. Their distribution has increased and their period of feeding activity has been prolonged. A state survey has been conducted to determine the presence of the nematode in the principal alfalfa- growing areas of the state. The population dynamics were followed during the 1985-86 growing season. Alfalfa samples, including stems and crowns, were taken from selected fields in each geographic area and the nematodes were extracted. Populations from the samples determined the fields infested and the periods

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11

Matheron, M., S. Winans, J. Matejka, and M. Rethwisch. "The Role of Cercospora Summer Black Stem and Leaf Spot in the Alfalfa Decline Problem in La Paz County." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/200830.

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An alfalfa decline problem has appeared recently in fields between Poston and Parker in La Paz County. Cercospora summer black stem and leaf spot, a fungal disease of alfalfa, has been associated with the decline problem. The efficacy of three fungicides were tested for control of the disease and the decline problem. Bravo, Kocide, and Spotless significantly reduced the severity of Cercospora summer black stem and leaf spot; however, significant increases in yield were not realized. Alfalfa decline in La Paz County may involve other factors in addition to plant disease.

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12

Tickes, B., and M. Ottman. "The Relationship Between Ten Alfalfa Varieties and the Presence of Weeds After Two Years." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/200831.

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13

Nigh, E. L. Jr. "Timing Nematicide Application for Control of Stem Nematodes Infecting Arizona Alfalfa." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/200832.

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The stem nematode Ditylenchus dipsaci attacks non-dormant Arizona alfalfa in the desert valleys; damage occurs during the cooler months of fall and spring. Efforts to introduce and retain resistant alfalfa has had limited success. From October until temperatures decrease below 50 F., the nematode reproduces and feeds. In warmer years, damage may be sustained from October until spring temperatures exceed 85 F. Chemical control may be warranted during these periods of feeding activity. Field trials were established to determine the efficacy of pesticides registered for use in alfalfa. Temil; Vyd

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14

Hilburn, Daniel J. "Population dynamics of overwintering life stages of the alfalfa weevil, Hypera postica (Gyllenhal)." Diss., Virginia Tech, 1985. http://hdl.handle.net/10919/27985.

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Virginia is a natural laboratory for studying overwintering habits of the alfalfa weevi1. At higher elevations, winters are relatively harsh and weevil pressure on the alfalfa crop is usually light. Much heavier pressure is the rule at lower elevations where winters are milder. The goal of this study was to examine the effects of fall and winter temperatures, parasites, and fall regrowth management on population dynamics of overwintering stages of this insect. Sixteen commercial alfalfa fields in Montgomery Co. (elevation 610 m) and Bedford Co. (elevation 300 m) were used in the study. Approxi

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15

Hajimorad, Mohammad Reza. "Variation in alfalfa mosaic virus with special reference to its immunochemical properties." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phh154.pdf.

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Includes Appendix listing other publications by the author. Includes bibliographical references (leaves 134-181). Alfalfa mosaic virus was isolated from lucerne (Medicago sativa) plants with a variety of disease symptoms. Experiments showed that each isolate was biologically distinct and that the host range and symptomatology of each isolate was affected by the environmental condition.

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16

De, Villiers M. (Marelize). "Die gebruik van 'n swaainet vir die monitering en diversiteitsbepaling van insekte op lusern in die Wes-Kaap." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52775.

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Thesis (MScAgric)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: Lucerne is the most important pasture and fodder crop in the winter rainfall area of South Africa. Various pests are known to cause damage to this crop. The use of the sweep net for monitoring pests is a cheap, easy and quick technique. If the sweep net is suitable for the lucerne pests in South Africa, potential pest status can be determined easily and quickly and the necessary precautionary measures taken to prevent crop losses. From a managerial point of view, it is also important to know the composition of the

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17

Jeffries, Alex Craig. "The study at the molecular level of the New Zealand isolate of Lucerne transient streak sobemovirus and its satellite RNA." Title page, contents and summary only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phj47.pdf.

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18

Zbylut, Joanna. "Modeling proportions to assess the soil nematode community structure in a two year alfalfa crop." Kansas State University, 2014. http://hdl.handle.net/2097/17327.

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Master of Science<br>Department of Statistics<br>Leigh Murray<br>The southern root-knot nematode (SRKN) and the weedy perennials, yellow nutsedge (YNS) and purple nutsedge (PNS) are simultaneously occurring pests in the irrigated agricultural soils of southern New Mexico. Previous research has very well characterized SRKN, YNS and PNS as a mutually-beneficial pest complex and has revealed their enhanced population growth and survival when they occur together. The density of nutsedge in a field could be used as a predictor of SRKN juveniles in the soil. In addition to SRKN, which is the most ha

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19

Kerns, David L. "Common Insect Contaminants Found in Arizona Lettuce." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/144795.

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2 pp.<br>This publication describes the common insects found in Arizona lettuce through the use of pictures. The insects include; lepidopterous larva, striped flea beetle, leafminer fly, leafminer mine, adult western flower thrips, winged adult aphid, false chinch bug, lygus bug, potato leafhopper, and threecornered alfalfa hopper.

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20

Geering, Andrew D. W. "The epidemiology of cucumber mosaic virus in narrow-leafed lupins (Lupinus angustifolius) in South Australia." Title page, table of contents and summary only, 1992. http://web4.library.adelaide.edu.au/theses/09PH/09phg298.pdf.

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21

Ottman, Michael J. "Nondormant Alfalfa Varieties for Arizona 2015." College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/576828.

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Revision of AZ1267<br>2 pp.<br>Alfalfa varieties differ in fall dormancy, defined as growth during the fall. Nondormant alfalfa varieties are usually planted in mild winter areas for their ability to grow in the late fall, winter, and early spring. Select alfalfa varieties that have resistance to potential pest problems. Alfalfa varieties are available that have salt tolerance or are Roundup Ready. Ratings are provided in this publication. Many of the varieties listed in this publication have been tested for yield and final stand by the University of Arizona in small plot trials.

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22

Dellinger, Theresa Ann. "Combined Roles of Glandular-haired Alfalfa and Natural Enemies in Alfalfa Pest Managment in Virginia." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/29140.

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Both alfalfa weevil, <i>Hypera postica</i> (Gyllenhal), (Coleoptera: Curculionidae), and potato leafhopper, <i>Empoasca fabae</i> (Harris), (Homoptera: Cicadellidae), remain key pests of alfalfa in Virginia. Commercial varieties of potato leafhopper-resistant (or glandular-haired) alfalfa were released in the mid-1990s, but the impact of alfalfa weevil on these varieties has not been well documented. In 1999, two large-scale field experiments were initiated to compare the performance of a glandular-haired alfalfa variety against a standard, non-glandular-haired variety under both alfalfa we

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23

Knowles, Tim C. "Alfalfa Aphid Complex." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/146689.

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4 pp.<br>The alfalfa aphid discussed in this publication includes blue alfalfa aphid, pea aphid, and the spotted alfalfa aphid. This publication discusses the biology of these alfalfa aphids, the damages they cause, the resistant varieties and biological control, and their monitoring and treatments.

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24

Ottman, Michael J. "Nondormant alfalfa varieties for Arizona 2016." College of Agriculture, University of Arizona (Tucson, AZ), 2016. http://hdl.handle.net/10150/625420.

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2 pp.<br>Alfalfa varieties differ in fall dormancy, defined as growth during the fall. Nondormant alfalfa varieties are usually planted in mild winter areas for their ability to grow in the late fall, winter, and early spring. Select alfalfa varieties that have resistance to potential pest problems. Alfalfa varieties are available that have salt tolerance or are Roundup Ready. Ratings are provided in this publication. Many of the varieties listed in this publication have been tested for yield and final stand by the University of Arizona in small plot trials. Revised 10/2016. Most recent versi

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25

Kuhar, Thomas P. "Population dynamics, mortality factors, and pest status of alfalfa weevil in Virginia." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/26256.

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The alfalfa weevil, Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), remains a serious pest in Virginia despite being under complete biological control in the northeastern U.S. In 1996, a survey of 187 alfalfa fields in Virginia was initiated to determine the current pest status of alfalfa weevil and incidence of natural enemies. Fields located in the Piedmont region of the state had significantly higher alfalfa weevil pressure than those in the Shenandoah Valley and southwestern region. The dominant natural enemy of alfalfa weevil larvae was the parasitoid, Bathyplectes anurus (Thom

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26

Clark, L. J., E. S. Heathman, E. DeRosa, and R. E. Cluff. "Alfalfa Herbicide Trial Greenlee County, 1989." College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/201014.

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Replicated herbicide experiments were carried out on alfalfa fields in Graham and Greenlee counties in the winter of 1989. Five herbicides were tested; tanzy mustard and (oxtail barley were the mails target weed species. Velpar L applied on at a rate of 4 pints per acre in 20 gallons of water provided the best control with 99% control of the broad -leafed weeds and 86% of the grassy weeds just prior to the first cutting. Better control of foxtail barley probably would have been achieved by several of the herbicides if they had been applied earlier, before the weeds germinated and /or if the ma

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27

Matheron, M., S. Winans, and M. Rethwisch. "Effect of Fungicides on Development of Cercospora Summer Black Stem and Leaf Spot in Alfalfa." College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/201032.

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Cercospora summer black stem and leaf spot, a fungal disease of alfalfa, has been associated with a stand decline problem in La Paz County. In a continuation of a study initiated in 1987, we examined the ability of three fungicides to control the disease and decline problem. Bravo, Funginex, and Kocide significantly reduced the severity of Cercospora summer black stem and leaf spot. In addition, significant increases in yield were recorded on plots treated with fungicides.

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28

Pooranampillai, Christina D. "Evaluation of resistance to Sclerotinia crown and stem rot caused by Sclerotinia trifoliorum in selected alfalfa cultivars." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43273.

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Sclerotinia crown and stem rot (SCSR) incited by Sclerotinia trifoliorum Eriks. causes severe losses in some fall-seeded, no-tillage plantings of alfalfa (Medicago sativa IL.) in Virginia. A mycelial plug inoculation technique was used to detect differences between cultivar (cv) responses of two alfalfa cvs, Arc and Vertus, under greenhouse conditions. A six dia plug from the margin of a 5-day-old culture of S. trifoliorum was placed near the crown area of a plant and incubated for a pre-determined period in a dew chamber at 18 C and 100% RH. Differences in isolate virulence were detected; cv

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29

Martin, Pierre. "Genetic studies on resistance to alfalfa mosaic virus (AMV) and tolerance to white clover mosaic virus (WCMV) in red clover (Trifolium pratense L.)." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61820.

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30

Dillehay, Bryan L. "Incorporating glyphosate-resistant alfalfa into field crop integrated pest management programs of Pennsylvania." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1990/index.html.

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31

Hajimorad, Mohammad Reza. "Variation in alfalfa mosaic virus with special reference to its immunochemical properties / Mohammad Reza Hajimorad." Thesis, 1990. http://hdl.handle.net/2440/19057.

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Includes Appendix listing other publications by the author.<br>Includes bibliographical references (leaves 134-181).<br>vi, 182 leaves : ill., photos ; 30 cm.<br>Alfalfa mosaic virus was isolated from lucerne (Medicago sativa) plants with a variety of disease symptoms. Experiments showed that each isolate was biologically distinct and that the host range and symptomatology of each isolate was affected by the environmental condition.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Pathology, 1990

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32

Jeffries, Alex Craig. "The study at the molecular level of the New Zealand isolate of Lucerne transient streak sobemovirus and its satellite RNA / Alex Craig Jeffries." Thesis, 1993. http://hdl.handle.net/2440/21450.

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Also available as microfiche.<br>Header title of microfiche :"The study of the molecular level of the NZ isolate of LTSV and its satellite RNA"<br>Bibliography: leaves 102-125.<br>iv, 126 leaves, [30] leaves of plates : ill. ; 30 cm.<br>Thesis (Ph.D.) -- University of Adelaide, Dept. of Biochemistry and Dept. of Plant Science, 1994.

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33

Geering, Andrew D. W. "The epidemiology of cucumber mosaic virus in narrow-leafed lupins (Lupinus angustifolius) in South Australia / Andrew D.W. Geering." Thesis, 1992. http://hdl.handle.net/2440/21628.

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Includes bibliographical references (leaves 147-171).<br>xx, 171 leaves : ill. (some col.), photos ; 30 cm.<br>Studies factors affecting the rate of epidemic progress of cucumber mosaic virus in Lupinus angustifolius.<br>Thesis (Ph.D.)--Dept. of Crop Protection, University of Adelaide,1992

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34

Ryalls, James M. "The impacts of climate change and belowground herbivory on aphids via primary metabolites." Thesis, 2016. http://hdl.handle.net/1959.7/uws:37585.

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Global climate and atmospheric change (summarised as climate change for brevity) may alter patterns of crop damage by insect herbivores, but little is known about how multiple climate change factors, acting in tandem, shape such interactions. Crucially, the specific plant-mediated mechanisms underpinning these effects remain largely unknown. Moreover, research into the effects of climate change on leguminous plant species, which have the ability to fix atmospheric nitrogen (N2) via their association with root nodule-dwelling rhizobial bacteria, and their associated insect herbivores, is surpri

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35

Walter, Andrew L. D. "A new mechanism to confer resistance to Alfalfa mosaic virus infection in white clover and tobacco using mutations to the ATP binding motif." Phd thesis, 2001. http://hdl.handle.net/1885/148470.

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36

Biddle, Julianne Maree. "Ecology and distribution of Alfalfa Mosaic Virus (AMV) and Trifolium repens for the ecological risk assessment of genetically modified AMV-resistant T. repens." Phd thesis, 2011. http://hdl.handle.net/1885/147201.

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This thesis presents a study of the ecology, distribution and pathology of the pasture speciesTrifolium repens and its pathogen Alfalfa mosaic virus (AMV) in south-eastern (SE) Australia, to inform an ecological risk assessment of transgenic AMV-resistant T. repens. There are concerns worldwide regarding the environmental release of pathogen-resistant (P-R) pasture plants as pasture species have a history of invasiveness. The key concern is that following release from pathogen pressure, P-R plants may become weedy. The results of this work indicate that T. repens is naturalised in many habita

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