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Dissertations / Theses on the topic 'Weeds'

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1

Tracey, Sara A. "In the Weeds." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1195243379.

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2

Howatt, Stephen M. (Stephen Michael). "Control of hexazinone tolerant weeds in lowbush blueberries." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61161.

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Field experiments were conducted from 1989 to 1991 to evaluate several sulfonylurea herbicides, glyphosate and clopyralid for the control of bunchberry and other hexazinone tolerant weeds in lowbush blueberry. Broadcast applications of chlorosulfuron, metsulfuron and glyphosate reduced bunchberry densities at all application dates, though crop damage and subsequent yield reductions were unacceptable. Glyphosate was very effective in controlling a large number of plant species when applied as a spot spray treatment. Tribenuron and DPX R9674 were effective in suppressing bunchberry stem densitie
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3

Minkey, David Mark. "Weed seed predation by ants in the crop growing areas of Western Australia /." Connect to this title, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0089.

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4

McGinley, Susan. "Fighting Weeds in Lemon Orchards: Weed-Sensing Sprayer Could be the Key." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2002. http://hdl.handle.net/10150/622246.

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5

Mühleisen, Martin Bernd. "Chemical weed control : options in fibre flax." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0031/MQ64411.pdf.

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6

Sciegienka, Joanna Katarzyna. "Vegetative reproduction and the integrated management of Canada thistle." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/sciegienka/SciegienkaJ0509.pdf.

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Canada thistle (Cirsium arvense (L.) Scop.) is an aggressive, introduced creeping perennial weed that flourishes in a wide variety of environments. Its deep, creeping root system and colony forming tendencies make it one of the most difficult weeds to control. A strategy that incorporates a better understanding of the biology of Canada thistle into the development of an integrated management plan that includes herbicides and biological control could help reduce the dispersal and impact of this species. The objectives of this work were to: 1) determine how Canada thistle emergence and growth ar
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7

Goudy, Heather Jayne. "Evaluation of site-specific weed management and implications for spatial biology of weeds." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0022/MQ51068.pdf.

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8

Shirzadifar, Alimohammad. "Identification of Weed Species and Glyphosate-Resistant Weeds Using High Resolution UAS Images." Diss., North Dakota State University, 2018. https://hdl.handle.net/10365/29304.

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Adoption of a Site-Specific Weed Management System (SSWMS) can contribute to sustainable agriculture. Weed mapping is a crucial step in SSWMS, leads to saving herbicides and protecting environment by preventing repeated chemical applications. In this study, the feasibility of visible and near infrared spectroscopy to classify three problematic weed species and to identify glyphosate-resistant weeds was evaluated. The canopy temperature was also employed to identify the glyphosate-resistant weeds. Furthermore, the ability of UAS imagery to develop accurate weed map in early growing season was e
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9

Zwickle, Sarah Lynn. "Weeds and Organic Weed Management: Investigating Farmer Decisions with a Mental Models Approach." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316453516.

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10

McCloskey, William B., Paul B. Baker, and Will Sherman. "Survey of Cotton Weeds and Weed Control Practice in Arizona Upland Cotton Fields." College of Agriculture, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/210369.

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The distribution of weed species and the herbicides and cultural practices used to control weeds in Arizona cotton fields were surveyed in 1995 and 1996. The most common weeds were purple nutsedge, bermudagrass, annual morningglory, Palmer amarnath, Wright groundcherry, common purselane, yellow nutsedge and Johnsongrass. The average statewide cost for hand weeding in 1995 was reported as $27.87 per acre in addition to other weed control costs. Statewide, most growers used preemergence herbicides before or at planting and used pre- and post-emergence herbicides later in the season. Most of thes
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11

St, John-Sweeting Robin. "The biology and ecology of rampion mignonette Reseda phyteuma L." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09AFM/09afms152.pdf.

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Bibliography: leaves 82-89. Rampion mignonette is an annual to short-lived perennial agricultural weed from the Mediterranean region, first found in vineyards at Clare, South Australia, in 1986. The biology and ecology of rampion mignonette was studied to provide a basis for its integrated control and management. The study includes a literature review, maps of world and Australian distribution and drawings showing plant habit and details. A field survey found that rampion mignonette showed little migration and that containment and population reduction could be achieved by careful management in
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12

Weller, Sandra. "Detection and prevention of the dispersal of the seeds of Chilean needle grass (Nassella neesiana Trin. & Rupr. (Barkworth)) in hay bales." Thesis, Federation University Australia, 2016. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/103000.

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Invasive and noxious weeds are well known as a pervasive problem, imposing significant economic burdens on all areas of agriculture, and thus their control and eradication are of central concern to the industry. Whilst there are multiple possible pathways of weed dispersal in this industry, of particular interest to this discussion is how the unintended dispersal of Chilean needle grass (Nassella neesiana) weed seeds, within emergency fodder, may be prevented. Periodic drought is a feature of the Australian climate, which, together with natural disasters of flood and bushfire, necessitates the
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13

Smith, Carey. "Studies on weed risk assessment." Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09AFM/09afms644.pdf.

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Bibliography: leaves 124-136. This thesis gives an overview of factors used in weed risk assessments and explores the disparity between the measured high accuracy rate of the weed risk assessment system (WRA) as implemented in Australia and the pessimistic assessments of some workers about the possibility of predicting the weed potential of plant species imported in the future. The accuracy of the WRA may not be as high as previously thought, and it varies with weed definition and taxonomic groups. Cluster analysis and comparative analysis by independent contrasts were employed to determine th
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14

Gunderson-Izurieta, Sharlyn Elizabeth. "Pulling together in the Estes Valley, Colorado a case study of a weed management area /." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1317326611&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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15

Maina, J. Mukami. "The effects of intercropping on weeds and weed management in maize growing in Kenya." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363436.

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16

Mutinda, Irene. "Biological control of mignonette weeds." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266625.

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17

McMillan, James Paul. "Rounding Up The Astrophysical Weeds." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460398754.

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18

McCoy, Jan. "Treating Waste Water With Weeds." College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/295662.

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19

Thomas, Dean Timothy. "Selective grazing by sheep to improve the control of weeds of crops." University of Western Australia. School of Animal Biology, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0041.

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[Truncated abstract] With the rapid development of multiple herbicide resistant weeds in crops, it is likely that an important role now exists for new grazing management strategies in farming systems to provide an integrated approach to weed management. In this thesis we examined the general hypothesis that sowing a legume of low preference by sheep relative to the target weeds of crops would improve the control of those weeds in a grazed pasture. To test this general hypothesis, legumes of low preference by Merino sheep were identified and a series of experiments conducted to determine the ef
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20

Thomas, Dean Timothy. "Selective grazing by sheep to improve the control of weeds of crops /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2006.0041.

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21

Toresson, Fredrik. "Tidig Ozu / Sen Ozu : En jämförande stilanalys av A Story of Floating Weeds och Floating Weeds." Thesis, Stockholm University, Department of Cinema Studies, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-912.

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<p>Syftet med denna uppsats är att jämföra ett av Ozus tidigare verk stumfilmen A STORY OF FLOATING WEEDS (1934) med ett senare, färg- och ljudfilmen FLOATING WEEDS (1959). Hur skiljer sig dessa åt stilistiskt, vad förenar dem, vad följer t ex av närvaron av färg och ljud i den senare och avsaknaden av desamma i den tidigare filmen.</p><p>Analysen utgår från ett neoformalistiskt perspektiv och i en teoretisk genomgång redogörs för denna inriktnings begreppsapparat. Centrala begrepp häri är t ex främmandegörning, d v s av-naturaliseringen av den vardagliga perceptionen, stil, definierat som inn
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22

Lavrador, Filipe Alexandre Casaca. "Vegetação infestante da linha ferroviária do Oeste. Controlo químico de Equisetum." Master's thesis, ISA/UTL, 2011. http://hdl.handle.net/10400.5/4066.

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Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia<br>This study presents a characterization of vegetation composition in Oeste railway line of Portugal, owned by REFER EPE, with 196,947 kilometres between the towns of Agualva- Cacém and Figueira da Foz in Western Portugal. At 2010 Spring, inquiries were made at REFER EPE and at 2011 Spring, 109 weed surveys were made in three locations on railway track profile, plus an adjacent area. 372 taxa were recorded and distributed in 75 families, with predominance of Fabaceae, Asteraceae e Poaceae. The taxon Equisetum ramosissi
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23

Clayton, Neil, and n/a. "Weeds, people and contested places : selected themes from the history of New Zealanders and their weeds 1770-1940." University of Otago. Department of History, 2007. http://adt.otago.ac.nz./public/adt-NZDU20071129.105550.

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This study examines three basic questions. Why did so many familiar floral species with which agricultural people have more or less successfully contested places for some 10,000 years apparently become highly problematic in New Zealand? How did those in whom the developing contest aroused considerable anxiety try to solve the problems they saw emerging? And what were the outcomes of their chosen courses of action? This study is organised around three main themes, science, the law and agricultural practices. Within each theme I take into consideration the ways New Zealanders used particular asp
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24

Omami, Elizabeth Nabwile, of Western Sydney Hawkesbury University, of Agriculture Horticulture and Social Ecology Faculty, and School of Horticulture. "Amaranthus retroflexus seed dormancy and germination responses to environmental factors and chemical stimulants." THESIS_FAHSE_HOR_Omami_E.xml, 1993. http://handle.uws.edu.au:8081/1959.7/66.

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A large number of weed seeds in the soil persist because of seed dormancy, and depletion of the seed bank through manipulation of seed dormancy has been suggested as one of the goals in weed control. This study was designed to investigate some of the factors which control dormancy and germination in Amaranthus retroflexus seeds. Germination studies were conducted at different temperatures, and either in continuous white light or in the dark. Higher temperatures increased germination and, although light interacted with temperature, its effect on germination varied with the temperature. In an at
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25

Stark, Jennifer Grace. "The establishment, drought tolerance, and weed suppression potential of multispecies sod." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/stark/StarkJ0509.pdf.

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Re-seeding is a frequently used technique to revegetate disturbed areas, but often leaves bare ground prone to weed invasion. Mixtures of drought tolerant or native species in sod could be used as an alternative to seed to provide rapid establishment of desirable plant communities that may potentially reduce weed emergence, survival, and productivity. Additionally, the reinforcement material required to aid transport of multispecies sod could further contribute to weed suppression and sod establishment. The objective of this study was to evaluate the weed suppression and establishment potentia
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26

Mirsky, Steven B. "Evaluating constraints and opportunities in managing weed populations with cover crops." Restricted access (UM), 2008. http://libraries.maine.edu/gateway/oroauth.asp?file=orono/etheses/37803141.pdf.

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These (Ph.D.)--Pennsylvania State University, 2008.<br>Title from PDF title page. Available through UMI ProQuest Digital Dissertations. Includes bibliographical references (leaves 164-171). Also issued in print.
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27

Ford, M. A. "Pollinator-mediated interactions between outbreeding annual weeds." Thesis, Swansea University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636991.

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Self-incompatible annual weed species, with similar flowers, flowering time and ecology were used to investigate the relationship between relative abundance, pollinator service and seed-set in two-species mixtures. In mixed stands of the mayweeds <i>Anthemis cotula</i> L. and <i>Tripleurospermum inodorum</i> (L.) Schultz Bip. the common capitulum-visiting insects (hoverflies and other diptera) seemed to find the two species equally attractive, frequently flying from one to the other. In a survey of wild populations of these species the number of insect visitors per capitulum was independent of
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28

Tickes, Barry. "Preharvest control of broadleaf weeds in wheat." College of Agriculture, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/205404.

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Nine herbicide treatments were evaluated for the control of mature nettleleaf goosefoot in durum wheat that was ten days from harvest. The only effective treatments were combinations of Glyphosate (Roundup Ultra Max and Touchdown) and Paraquat (Gramoxone). Applications of Aim, Gramoxone, and Glyphosate alone were ineffective.
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29

Amisi, Karen Janila. "Strategies for managing weeds in a wheat, red clover, vegetable crop rotation transitioning to organic production /." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1070933281.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Document formatted into pages; contains 154 p. Includes bibliographical references. Abstract available online via OhioLINK's ETD Center; full text release delayed at author's request until 2005 Dec 28.
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30

De, Luna Lilian Z. "Pathogenicity of the three Curvularia isolates to Cyperaceae weeds and rice, Oryza sativa L." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35869.

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Three isolates of Curvularia belonging to Curvularia tuberculata (isolates 93-020 and 93-022) and Curvularia oryzae (isolate 93-061) were obtained from diseased Cyperus difformis, Cyperus iria, and Fimbristylis miliacea, respectively, in the Philippines in 1993. Under greenhouse conditions, these fungal isolates caused high mortality and significant plant dry weight reduction in C. difformis, C. iria, and F. miliacea when sprayed at the rate of 1 x 108 spores/m3. Cross-pathogenicity of the isolates was demonstrated in three other sedge weed species. C. difformis, C. iria, and F. miliacea were
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31

Minkey, David Mark. "Weed seed predation by ants in the crop growing areas of Western Australia." University of Western Australia. Faculty of Natural and Agricultural Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0089.

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[Truncated abstract] In the crop growing areas of Western Australia, two economically important weed species, Lolium rigidum Gaud. (annual ryegrass) and Raphanus raphanistrum L. (wild radish), have evolved widespread herbicide resistance to multiple chemistry groups. Consequently, grain growers in the region have adopted an integrated approach to weed management that includes many non herbicide tools, however many more are needed as these weed species become increasingly more difficult to control. This thesis examines, in a series of field trials carried out in the Western Australian crop grow
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32

Davis, Philip Browning. "The invasion potential and competitive ability of Camelina sativa (L.) Crantz (camelina) in rangeland ecosystems." Thesis, Montana State University, 2010. http://etd.lib.montana.edu/etd/2010/davis/DavisP0510.pdf.

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Camelina sativa (L.) Crantz (large-seeded false-flax) is a recently introduced oilseed crop in Montana and has potential for large scale production for the biofuel market. However, due to weedy characteristics, the invasive potential of this species is of concern. A need exists to create a pre-entry protocol to accurately assess risk to minimize uncertainty inherent in qualitative weed risk assessment approaches. We assessed the probability of C. sativa to invade rangeland ecosystems of southwest Montana to address this concern. The objectives of this study were to 1) quantitatively assess the
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33

Eriksson, Anna-Mia Hansson David Huisman Mark Lundh Jan-Erik. "Metoder för vegetationsbekämpning på banvallar : en summering av resultat från UICs Vegetation Control Project och erfarenheter från Institutionen för landskaps- och trädgårdsteknik = Vegetation control methods on railway embarkment and track area/." Alnarp : Sveriges lantbruksuniversitet, Institutionen för landskaps- och trädgårdsteknik, 2004. http://publikationer.slu.se/Filer/Rjrapportslutversionskrivskyddad.pdf.

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34

Poliquin, Bernard. "Quackgrass [Agropyron repens (L.) Beauv.] control in potatoes with quizalofop-ethyl." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59287.

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Field trials were conducted to evaluate the effect of quizalofop-ethyl on quackgrass plants in a potato cropping sequence. Fall and summer applications were compared for their quackgrass control potential. Season-long quackgrass control was obtained with quizalofop-ethyl at 96 g/ha following summer application. An increase in the rate of quizalofop-ethyl did not further improve control. Yields with quizalofop-ethyl at 96 g/ha were similar to standard treatments sethoxydim and fluazifop-butyl at recommended rates. Quackgrass control following a summer application was not maintained through to t
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35

Humphries, Talia. "Initiating temperate grassland restoration by controlling the dominant weed species; a case study with Nassella trichotoma." Thesis, Federation University Australia, 2022. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/187267.

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Temperate grasslands are globally important biomes, in that they (i) provide habitat for a wide diversity of species, (ii) sequester large stocks of carbon, and (iii) provide forage for important pollinators (Chapter 1). These ecosystems often fall within highly fertile areas, and consequently humans have come to depend on them to provide high quality forage for grazing livestock and land for agricultural development. Temperate grasslands are considered to be critically endangered on a global scale. The grazing industry relies upon healthy and productive grasslands for the production of a subs
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36

Serage, Tammam Ibrahim. "Effects of overseeded legume living mulches and tillage on weed suppression and broccoli yield." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-01102009-063231/.

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37

Röhrig, Manfred. "Modelling the light competition between crops and weeds." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=956719619.

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38

Tripp, Timothy A. "Cultural control of broadleaf weeds in turfgrass swards." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ27549.pdf.

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39

Lintell-Smith, Gail. "The population dynamics of weeds in winter wheat." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297011.

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40

Marshall, Harriet. "Management of grass weeds in over-wintering stubbles." Thesis, University of Reading, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433468.

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41

Thacker, Gary W., and Wayne E. Coates. "How to Mechanically Remove Weeds from the Row." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/210862.

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42

Crider, Kimberly Kay. "BIOLOGICAL CONTROL: EFFECTS OF TYRIA JACOBAEAE ON THE POPULATION DYNAMICS OF SENECIO JACOBAEA IN NORTHWEST MONTANA." The University of Montana, 2010. http://etd.lib.umt.edu/theses/available/etd-03092010-140634/.

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<p>Biological control, using introduced, specialist insects is a common strategy for controlling plant invasions. However, the efficacy of biological control agents in controlling their host plants is rarely quantified population level. I quantified the impact of a specialist biological control agent, the cinnabar moth <i>(Tyria jacobaeae)</i> on its host plant, tansy ragwort <i>(Senecio jacobaea)</i> in northwest Montana. Cinnabar moth damage and its effects on important plant vital rates were tested with and without specialist herbivores. The presence of moth larvae corresponded to a reducti
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43

Sosnoskie, Lynn Marie. "Investigations in weed biology studies at the plant, population, and community levels /." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1102976937.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xx, 147 p.; also includes graphics (some col.) Includes bibliographical references (p. 137-147).
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Asquith, Ilse Bernadette. "An investigation of statistical methodologies for evaluating natural herbicides for the control of yellow nutsedge (Cyperus esculentus)." Thesis, Nelson Mandela Metropolitan University, 2007.

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The present study was undertaken with the view to evaluate methodologies based on traditional Scheffé experimental designs that study mixtures as a tool for discovery research particularly when seeking new and or improved uses of existing mixtures. For the purpose of this study, the topic of controlling the problematic weed known as Yellow Nutsedge (Cyperus esculentus L. var. esculentus) or “Geel Uintjie”, was selected on a rather ad hoc basis. Yellow Nutsedge is a troublesome perennial weed found in most agricultural countries in the world. Herbicidal control is often difficult because of the
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Womack, Jonathan G. "Development of a mycoherbicide for bracken control." Thesis, University of Strathclyde, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336477.

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Prus, J. L. "New methods of risk assessment for the release of transgenic plants." Thesis, Cranfield University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360068.

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47

Bentivegna, Diego Javier. "Integrated management of the invasive weed, cut-leaved teasel (Dipsacus laciniatus L.) along a Missouri highways." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5549.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2008.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on July 22, 2009) Includes bibliographical references.
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48

Mayonado, David James. "Field, greenhouse, and laboratory studies on the efficacy and action of the herbicides SC-0051 and SC-0774." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53586.

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SC-0051 and SC-0774 are two experimental herbicides of undisclosed chemistry. A three year field study was conducted to evaluate SC-0051 and SC-0774 for weed control in conventional and no-till corn in Virginia. SC-0051 applied preemergence or postemergence, controlled common lambs-quarters (Chenopodium album L.), common ragweed (Ambrosia artemisiifolia L.) horseweed (Conyza canadensis (L.) Cronq.), common chickweed (Stellaria media (L.) Vill. and was safe to corn. SC-0051 did not control smooth pigweed (Amaranthus hybridus L.) or giant foxtail (Setaria faberi Herrm.). SC-0774 effectively cont
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49

Jones, Brandon Tyler. "An Evaluation of a Low-Cost UAV Approach to Noxious Weed Mapping." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2146.pdf.

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50

Stock, Daniel. "The Dynamics of Lantana Camara (L.)Invasion of Subtropical Rainforest in Southeast Queensland." Thesis, Griffith University, 2005. http://hdl.handle.net/10072/366732.

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Lantana Lantana camara L. is a highly aggressive exotic environmental weed that is weestablished throughout eastern Australia and is reportedly able to displace native vegetation under a range of conditions. Whether lantana is able to displace native vegetation in the absence of anthropogenic disturbance is subject of some disagreement in the literature. The question remains, however, as to what is the future for the Gold Coast hinterland rainforests in the face of invasion by lantana? This study is mainly directed at addressing the dynamics at the lantana/rainforest interface, especially lant
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