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Dissertations / Theses on the topic 'Weeds Biological control South Australia'

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Published: 4 June 2021

Last updated: 2 February 2022

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1

Baker, Jeanine. "Factors affecting the establishment of a classical biological control agent, the horehound plume moth (Wheeleria spilodactylus) in South Australia." Title page, summary and contents only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phb1677.pdf.

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Includes bibliographical references (leaves 168-198) The horehound plume moth (Wheeleria spilodactylus Curits), an agent introduced to control the invasive weed horehound (Murrubium vulgare L.), was used as a model system to investigate factors believed to influence the successful establishment of an introduced natural enemy. Retrospectively tests the use of generic population viability analysis and decision making tools for determining optimal release strategies for the horehound plume moth in South Australia and to compare outcomes with the emprical data collected during the course of this p

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2

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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3

Mayo, Gwenda Mary. "Genetic variation in Hypericum perforatum L. and resistance to the biological control agent Aculus hyperici liro /." Title page, table of contents and abstract only, 2004. http://web4.library.adelaide.edu.au/theses/09PH/09phm4731.pdf.

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4

Heystek, Fritz. "Laboratory and field host utilization by established biological control agents of Lantana camara L. in South Africa." Thesis, Rhodes University, 2006. http://eprints.ru.ac.za/255/.

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5

Gordon, Antony John. "The biological control of Hakea sericea Schrader by the Hakea seed-moth, Carposina autologa Meyrick, in South Africa." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005330.

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Hakea sericea Schrader was introduced to South Africa from Australia and has become a major problem in nearly all the coastal mountain ranges of the Cape Province. The hakea seed-moth, Carposina autologa Meyrick was released in South Africa for the biological control of H. sericea. The impact of the moth on the canopy-stored seeds of H. sericea was evaluated at two study sites in the south-western Cape over three years. The moth has reduced the accumulated seeds at the two study sites by 59.4% and 42.6%, respectively. The moth has shown a surprising ability to disperse and establish new coloni

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6

Alfaro, Lemus Ana Lilia. "Factors influencing the control of citrophilous mealybug Pseudococcus calceolarie (Maskell) by Coccophagus gurneyi Compere in the Riverland of South Australia." Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09IM/09iml562.pdf.

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Includes bibliographical references (leaves 102-114) The highly successful biological control of the citrophilous mealybug Pseudococcus calceolarie (Maskell) (CM) by the parasitic wasp Coccophagus gurneyi Compere in several countries led to the release of this parasitoid in the Riverland of South Australia as part of an integrated pest management program. However CM has not been successfully controlled in this region. The results of this study may help to explain the lack of effective biological control of CM in Riverland citrus.

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7

Stafford, Martha Louise. "Biological control as an integrated control method in the management of aquatic weeds in an urban environmental and socio-political landscape : case study : Cape Town Metropolitan Area." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013015.

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Aquatic weeds transform and degrade the ecosystems which they invade, impacting various aspects of their surroundings ranging from the community level to disrupting important processes affecting ecosystem services. All of the major aquatic weeds of South Africa are found in the Cape Town Metropolitan Area. Landowners, whether private or public, are legally obliged to manage the listed invasive species through applying environmentally acceptable methodologies. This thesis provides an overview of the strategic management options, prevention, early detection, rapid response and eradication of new

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8

Soleyman-Nezhadiyan, Ebrahim. "The ecology of Melangyna viridiceps and Simosyrphus grandicornis (Diptera : Syrphidae) and their impact on populations of the rose aphid, Macrosiphum rosae." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phs685.pdf.

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Bibliography: leaves 213-233. This thesis studies the influence of the two common syrphid species on populations of rose aphids in rose gardens in Adelaide. The study determines whether the provision of attractive flowers increases the suppressive effect of syrphids on rose aphids and analyses some ecological and biological aspects of two syrphid species -- Melangyana viridiceps (Macquart) and Simosyrphus grandicornis (Macquart) -- in a Mediteranean climate to obtain a better understanding of their biological control potential.

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9

Van, der Westhuizen Liamé. "The evaluation of Phenrica sp.2 (Coleoptera: Chrysomelidae: Alticinae), as a possible biological control agent for Madeira vine, Anredera cordifolia (Ten.) Steenis in South Africa." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005375.

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Anredera cordifolia (Basellaceae), Madeira vine, is a perennial, semi- succulent climber native from Paraguay to southern Brazil and northern Argentina. It has a history of weediness and difficulty of control once established. In South Africa Madeira vine has a wide range and distribution with altitudes ranging from 10-1800m above sea level. Described as a transformer species, its sheer weight is capable of breaking branches off trees, causing the potential collapse of forest canopies. Chemical and mechanical control methods are expensive, labour intensive and may provide only temporary relief

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10

Bownes, Angela. "Evaluation of a plant-herbivore system in determining potential efficacy of a candidate biological control agent, cornops aquaticum for water hyacinth, eichhornia crassipes." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005373.

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Water hyacinth, Eichhornia crassipes Mart. Solms-Laubach (Pontederiaceae), a freefloating aquatic macrophyte of Neotropical origin, was introduced into South Africa as an ornamental aquarium plant in the early 1900’s. By the 1970’s it had reached pest proportions in dams and rivers around the country. Due to the sustainability, cost efficiency and low environmental risk associated with biological control, this has been a widely used method in an attempt to reduce infestations to below the threshold where they cause economic and ecological damage. To date, five arthropod and one pathogen biocon

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11

Robertson, Hamish Gibson. "The ecology of Cactoblastis cactorum (Berg) (Lepidoptera : phycitidae) in relation to its effectiveness as a biological control agent of prickly pear and jointed cactus in South Africa." Thesis, Rhodes University, 1985. http://hdl.handle.net/10962/d1005356.

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The successful biological control of the shrub-like prickly pear Opuntia stricta Haworth in Australia by cactoblastis cactorum (Berg) was not repeated when C. cactorum, derived from the Australian population, was released in South Africa in the 1930's against the tree prickly pear Opuntia ficus-indica (L.) Miller. Resistance of the woody portions of o. ficus-indica to attack by C. cactorum was regarded as the main reason for the poor performance of C. cactorum in South Africa. C. cactorum also oviposits and feeds on Opuntia aurantiaca Lindley, which is currently South Africa's most important w

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12

Baars, Jan-Robert. "Biological control initiatives against Lantana camara L. (Verbenaceae) in South Africa : an assessment of the present status of the programme, and an evaluation of Coelocephalapion camarae Kissinger (Coleoptera: Brentidae) and Falconia intermedia (Distant) (Heteroptera: Miridae), two new candidate natural enemies for release on the weed." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1005329.

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Lantana camara (lantana), a thicket-forming shrub, a number of different varieties of which were introduced into South Africa as ornamental plants but which has become a serious invasive weed. Conventional control measures for lantana are expensive and ineffective and it has therefore been targeted for biological control since 1961. To date, eleven biological control agent species have become established on lantana in South Africa. However, most agents persist at low densities and only occasionally impact plant populations. Three species regularly cause significant damage, but only reach suffi

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13

Tourle, Robyn. "Effects of ant predation on the efficacy of biological control agents Hypena Laceratalis Walker (Lepidoptera : noctuirdae) ; Falconia intermedia Distant (Hemiptera : Miridae and Teleonemia scrupulosa Stål (Hemiptera: Tingidae) on Lantana Camara (Verbenaceae) in South Africa." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1005362.

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Lantana camara L. (Verbenaceae) remains a highly invasive and ecologically damaging weed in South Africa, despite some 50 years of biological control efforts. Lack of success has been ascribed to varietal differences, climate and predation of agents but these have not been tested. In this study, the effects of ant predation were tested on populations of three biological control agents for L. camara. Colonies of two species, Crematogaster sp. 1 and 2 were investigated. Crematogaster sp. 1 colonies were offered no choice between immature stages of the agents Hypena laceratalis Walker (Lepidopter

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14

Marlin, Danica. "The role of the mite Orthogalumna terebrantis in the biological control programme for water hyacinth, Eichhornia crassipes, in South Africa." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005450.

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Water hyacinth (Eichhornia crassipes) is an aquatic macrophyte originating from the Amazon basin. Due to its beautiful appearance it has been introduced into numerous countries across the world as an ornamental pond plant. It was introduced into South Africa in the early 1900s and has since reached pest proportions in many of the country’s fresh water bodies, causing significant economic and ecological losses. It is now considered to be the worst aquatic weed in South Africa. Efforts to control the spread of the weed began in the early 1970s and there have been some successes. Biological contr

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15

Kleinjan, C. A. "The natural enemies of Asparagus asparagoides (L.) Wight in South Africa and their potential for use as biological control agents in Australia." Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/11663.

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Bibliography: leaves 73-76.<br>A form of the southern African plant Asparagus asparagoides (Asparagaceae), is a serious environmental week in Australia, where it is known as bridal creeper. Bridal creeper has an extensive underground tuber system and can invade native vegetation, two factors that make chemical and/or mechanical control difficult. The fruit is bird dispersed which facilitates colonisation of new sites. Surveys for potential biological control agents for use against bridal creeper in Australia were initiated in South Africa during 1989. This dissertation describes the identifica

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16

Heshula, Unathi-Nkosi Lelethu Peter. "Induced plant responses of different Lantana camara L. (Verbenaceae) varieties to herbivory by Falconia intermedia (distant) (Hemiptera: Miridae)." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1015368.

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A highly variable invasive shrub, Lantana camara L. (Verbenaceae), has been notoriously difficult to control thus far despite a well established biological control programme in South Africa. A promising leaf-feeding biological control agent, Falconia intermedia (Distant) (Hemiptera: Miridae), released to control this invasive plant eventually crashed at three out of five sites in the Eastern Cape Province. In the Mpumalanga Province, after initially colonising and building up high numbers on the L. camara stands the agent populations crashed. Several reasons for these population crashes have b

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17

Kwong, Raelene M., Linda M. Broadhurst, Brian R. Keener, Julie Coetzee, Nunzio Knerr, and Grant D. Martin. "Genetic analysis of native and introduced populations of the aquatic weed Sagittaria platyphylla – implications for biological control in Australia and South Africa." 2017. http://hdl.handle.net/10962/76991.

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Sagittaria platyphylla (Engelm.) J.G. Sm. (Alismataceae) is an emergent aquatic plant native to southern USA. Imported into Australia and South Africa as an ornamental and aquarium plant, the species is now a serious invader of shallow freshwater wetlands, slow-flowing rivers, irrigation channels, drains and along the margins of lakes and reservoirs. As a first step towards initiating a classical biological control program, a population genetic study was conducted to determine the prospects of finding compatible biological control agents and to refine the search for natural enemies to source p

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18

Chauhan, Bhagirath Singh. "Ecology and management of weeds under no-till in southern Australia." 2006. http://hdl.handle.net/2440/37881.

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No - till systems have been widely adopted by farmers in Australia over the past decade to reduce soil erosion, improve soil physical and chemical properties, conserve soil moisture and save on fuel costs. These changes in tillage practices can have a major influence on the ecology and management of weeds. Studies were undertaken on the seed biology of six important Australian weed species to provide underpinning knowledge of their response to tillage. Field studies were also undertaken to investigate the effect of no - till on weed seedling emergence, seed bank persistence and herbicide behav

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19

Eslami, Seyed Vahid. "Ecology of wild radish (Raphanus raphanistrum) : crop-weed competition and seed dormancy." 2006. http://hdl.handle.net/2440/59619.

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Title page, table of contents and abstract only. The complete thesis in print form is available from the University of Adelaide Library.<br>Field experiments investigating the nature and extent of interference in monocultures and mixtures of wild radish and wheat were conducted in 2003 and 2004 at Roseworthy, South Australia. Intraspecific and interspecific interfenernce between wild radish and wheat was investigated in the field using additive series design. Results indicated that higher densities of wheat were able to suppress seed production of this weed species.<br>http://proxy.library.ad

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20

Katembo, Naweji. "Impact of biocontrol agents on Lantana camara L. (Verbenaceae) in the lowveld region of Mpumalanga, South Africa." Thesis, 2018. https://hdl.handle.net/10539/25839.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the academic requirements for the degree of Doctor of Philosophy School of Animal, Plant and Environmental Sciences. Johannesburg, June 2018.<br>Lantana camara L. (sensu lato) (Verbenaceae) remains one of the worst invasive alien plants in most tropical and subtropical parts of the world, including South Africa. Despite a concerted biological control (biocontrol) effort, with 45 biocontrol agents released against the weed worldwide since the early 1900s to date, L. camara control is

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21

Hill, M. P., and Julie Coetzee. "The biological control of aquatic weeds in South Africa: current status and future challenges." 2017. http://hdl.handle.net/10962/59909.

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Aquatic ecosystems in South Africa have been prone to invasion by introduced macrophytes since the late 1800s, when water hyacinth, Eichhornia crassipes (Mart.) Solms-Laub. (Pontederiaceae), was first recorded as naturalised in KwaZulu-Natal (Cilliers 1991). Several other species of freshwater aquatic plants, all notorious weeds in other parts of the world, have also become invasive in many of the rivers, man-made impoundments, lakes and wetlands of South Africa (Hill 2003). These are Pistia stratiotes L. (Araceae) (water lettuce); Salvinia molesta D.S. Mitch. (Salviniaceae) (salvinia); Myriop

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22

Kitt, Jörg Thomas. "Introduction of Aphidius rosae into Australia for biological control of the rose aphid (Macrosiphum rosae)." 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phk608.pdf.

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Bibliography: leaves 221-240. This thesis deals with the introduction of "Aphidius rosae" as a classical biological control agent into South-Eastern Australia. Appropriate host specificity tests are carried out. Laboratory experiments are also completed to gain a better understanding of the interactions between host and parasitoid in the field. The study aims to monitor the performance of the control agent in the Adelaide environment for the first two years after initial release. It is also planned to invent an experimental field technique to estimate the impact of the control agent on rose ap

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23

Kitt, Jorg Thomas. "Introduction of Aphidius rosae into Australia for biological control of the rose aphid (Macrosiphum rosae) / by Jorg Thomas Kitt." 1996. http://hdl.handle.net/2440/18781.

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Bibliography: leaves 221-240.<br>viii, 240, [13] leaves : ill. (some col.), maps ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>This thesis deals with the introduction of "Aphidius rosae" as a classical biological control agent into South-Eastern Australia. Appropriate host specificity tests are carried out. Laboratory experiments are also completed to gain a better understanding of the interactions between host and parasitoid in the field. The study aims to monitor the performance of the control agent in the A

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24

Cowie, Blair William. "Bugweed biocontrol: new insights into the biological control agents of Solanum mauritianum, Gargaphia decoris and Anthonomus santacruzi." Thesis, 2016. http://hdl.handle.net/10539/21676.

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A Dissertation submitted to the Faculty of Science, University of the Witwatersrand, in partial fulfilment of the requirements for the degree of Master of Science, Johannesburg, South Africa. 2016.<br>Solanum mauritianum Scopoli (Solanaceae) is a perennial tree or shrub native to South America, which has become a prominent and widespread invader in numerous sub-tropical countries around the world. In South Africa, S. mauritianum is listed as one of the country’s worst ecological weeds, having been targeted for biological control efforts since 1984. Despite some constraints, biocontrol ef

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25

King, Anthony Michael. "The effect of temperature on biological control of water hyacinth, Eichhornia crassipes (Pontederiaceae) in South Africa." Thesis, 2012. http://hdl.handle.net/10539/11066.

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MSc., Faculty of Science, University of the Witwatersrand, 2011<br>The behaviour and physiology of every insect, during all developmental stages, is largely determined by temperature. Metabolic rate, flight activity, nutrition, growth rate, oviposition and longevity can all be correlated to temperature. Consequently, insect development occurs within a definite temperature range which can be experimentally determined. This serves as a basis from which models that estimate insect growth, development and reproduction can be formulated. Such studies on temperature-dependent development are th

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26

Oberholzer, Izak Gerhardus. "The effect of nutrient rich water on the biological control of water hyacinth." Diss., 2002. http://hdl.handle.net/2263/28536.

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Please read the abstract on p1 of the document 00dissertation<br>Dissertation (M Inst Agrar (Sustainable Insect Management))--University of Pretoria, 2007.<br>Zoology and Entomology<br>M Inst Agrar<br>unrestricted

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27

Craemer, Charnie. "Eriophyidae (Acari) as potential control agents of South African weeds, with descriptions of a new species of Tegonotus nalepa and of Paraphytoptus nalepa." Thesis, 2014. http://hdl.handle.net/10210/9776.

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M.Sc. (Zoology)<br>This study centres around the findings on mites (Acari: Eriophyidae) (also referred to as "eriophyids") as potential biological control agents of weeds in South Africa. The use of mites in the biological control of weeds is briefly reviewed. Four species of the family Eriophyidae have been used against weeds in other countries. Seventeen eriophyid species, causing symptoms possibly of significance to biological weed control of 12 plant species regarded as weeds in South Africa, are discussed. Methods to rear and study eriophyids in the laboratory have not yet been fully deve

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28

Kokkinn, M. J. (Michael J. ). "A control strategy for `Tanytarsus barbitarsis` Freeman (Diptera : Chironomidae), a small-scale pest organism / M.J. Kokkinn." 1986. http://hdl.handle.net/2440/20989.

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Bibliography: leaves 214-235<br>iv, 235 leaves : ill ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Zoology, 1987

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29

Paull, Cate. "The ecology of key arthropods for the management of Epiphyas postvittana (Walker) (Lepidoptera: Tortricidae) in Coonawarra vineyards, South Australia." 2008. http://hdl.handle.net/2440/47971.

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There is currently little knowledge about the dynamics of invertebrates in Australian viticultural ecosystems. This study was conducted in Coonawarra vineyards over three seasons (years) and has focused on identifying natural enemies, their seasonal phenology, multiple species interactions, and potential for the suppression of the pest lepidopteran Epiphyas postvittana (Tortricidae). The work presented in this thesis shows that endemic natural enemies have far greater potential to control E. postvittana than has been realised. An initial survey identified a diverse and abundant range of potent

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30

Van, der Westhuizen Liamé. "The evaluation of Phenrica sp. 2 (Coleoptera: Chrysomelidae: Alticinae), as a possible biological control agent for Madeira vine, Anredera cordifolia (Ten.) Steenis in South Africa /." 2006. http://eprints.ru.ac.za/496/.

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