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Dissertations / Theses on the topic 'Insects as carriers of plant disease'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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1

Groen, Simon Cornelis. "Manipulation of plant-insect interactions by insect-borne plant viruses." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648187.

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2

Srivatsavai, Venkata Suresh Kumar Huettel Robin Norton. "Identification, distribution and vector biology of brome mosaic virus of wheat in Alabama." Auburn, Ala., 2005. http://hdl.handle.net/10415/1266.

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3

Engelbrecht, Rene. "The role of the mediterranean fruit fly, Ceratitis capitata, in Botrytis bunch rot of grape." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53168.

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Thesis (MScAgric)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: Botrytis bunch rot of grape is caused by Botrytis cinerea Pers. :Fr. Conidia of the pathogen, which is dispersed by wind, water droplets and by insects, can penetrate the intact grape berry cuticle, but disease expression occurs only under predisposing conditions. Since relatively high infection rates often occur in vineyards, predisposing factors must play a fundamental role in primary infection and subsequent disease occurrence. Insects can play a very important role in this regard by depositing inocula at wound

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4

Lewis, Katherine JoAnn. "Studies on the spread of Verticicladiella procera by soil-borne and insect-borne propagules." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/91132.

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Studies were undertaken to determine the dispersal mechanisms of Verticicladiella procera Kendrick, the causal agent of Procera Root Disease (PRD). Propagule germinability in artificially infested soil decrease rapidly under natural and controlled conditions. Colonization of seedlings in artificially infested soil was rare and symptoms were not displayed by colonized seedlings. Natural populations of V. procera were closely associated with colonized root tissue. Colonization of field planted seedlings was related to proximity to root collars of diseased trees and insect activity on the see

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5

Walter, Cheryl Tracy. "Establishing experimental systems for studying the replication biology of Providence virus." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1003987.

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Providence virus (PrV) is a member of the Tetraviridae, a family of small, positive sense, single-stranded RNA viruses, which characteristically infect the midgut tissue of heliothine larvae. PrV is the only known tetravirus that replicates in cultured insect cells. The virus comprises a monopartite genome resembling members of the genus Betatetravirus with the capsid precursor protein undergoing autoproteolytic cleavage at its C-terminus consistent with other tetravirus capsid precursor proteins. Analysis of viral cDNA predicted the presence of three potential overlapping gene products (from

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6

Gracia, Javier. "Lettuce stunt : effect of Pythium populations and interactions between Pythium tracheiphilum and nematodes." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59387.

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This research has focused on the determination of natural populations in the fields, the effect of different inoculum densities on lettuce growth and a study of the association of this fungus with two nematodes (Pratylenchus penetrans Cobb and Meliodogyne hapla Chitwood). Under conditions of artificial infestation of soil the results were satisfactory, but in trials with naturally infested soil the fungus could not be detected. The effect of different inoculum densities was measured at different stages of growth, and only in those plants inoculated 2 weeks after seeding were differences signif

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7

Staffa, Pumla. "Anti-tick activities of extracts of Tulbaghia violacea (Alliaceae) cultivated in hydroponic media amended with entomopathogenic fungi (Hypocreales)." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2830.

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Thesis (MTech (Horticulture))--Cape Peninsula University of Technology, 2018.<br>Ticks and tick-borne diseases are important limiting factors to the attainment of sustainable animal and human health, affecting livelihood of resource poor farming communities in developing countries. Rhipicephalus appendiculatus and Amblyomma variegatum (Ixodidae) are among the most troubling tick species in Africa. While ticks can be controlled by applying chemical acaricides, these chemicals are quite expensive, especially, for small-scale famers in developing countries. Hence, the quest for alternative tick c

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8

Bisnieks, Maris. "Barley yellow dwarf epidemiology /." Uppsala : Dept. of Entomology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200675.pdf.

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9

Cruz, Danilo Esdras Rocha. "Fauna de mosquiteiros (Diptera: Culicidae) em fragmento de caatinga no Alto Sertão Sergipano." Pós-Graduação em Ecologia e Conservação, 2013. https://ri.ufs.br/handle/riufs/4415.

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The family Culicidae has great public health importance for being composed by haematophagous insects in majority, which can be vector of diseases for the human being and other vertebrates. The knowledge about culicideos fauna, besides of data about various species that compose the Caatinga biome, can also bring information about species that are vector of pathogens, providing important tools in case of eventual epidemic outbreak at the region. The Caatinga biome occupies around 55% of all northeast region, representing 11% of Brazil s surface, and holds the position of the less preserved biom

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10

Gasparoto, Maria Cândida de Godoy. "Epidemiologia comparativa entre \'Candidatus Liberibacter asiaticus\' e \'Candidatus Liberibacter americanus\' em ambiente controlado." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-20102010-164555/.

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Huanglongbing é a mais destrutiva doença da citricultura mundial. Seu recente relato no Brasil, em 2004, e a detecção de duas espécies bacterianas associadas à doença -Candidatus Liberibacter asiaticus e Candidatus Liberibacter americanus resultaram em poucos estudos do comportamento do Huanglongbing nas condições dos pomares brasileiros. Os objetivos deste trabalho foram (i) comparar a eficiência de infecção por Candidatus Liberibacter asiaticus e Candidatus Liberibacter americanus em plantas cítricas inoculadas por meio de enxertia com as duas espécies bacterianas, separadamente, e mantidas

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11

Junior, Newton Cavalcanti de Noronha. "Efeito dos coespecíficos e voláteis das plantas Murraya paniculata (L.) Jack, Psidium guajava L. e Citrus sinensis (L.) Osbeck sobre o comportamento de Diaphorina citri Kuwayama (Hemiptera:Psyllidae)." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-20042010-102148/.

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Os agroecossistemas consistem em complexas relações tróficas entre plantas, herbívoros, e seus inimigos naturais. Sabe-se que a maioria das plantas é capaz de produzir compostos voláteis, utilizados como sinais químicos por diferentes grupos de insetos. Esses voláteis podem ser produzidos de forma constitutiva em plantas sadias, ou seja, sem indução. Por outro lado, a produção de voláteis induzidos se dá a partir do contato de secreções liberadas pelo fitófago com injurias ocasionadas pela alimentação ou oviposição no tecido vegetal. Para os fitófagos esses voláteis podem sinalizar a presença

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12

Nascimento, Ana Mércia Dias. "Atividade repelente e larvicida de Xylopia laevigata, X. frutescens (Annonaceae) e Lippia pedunculosa (Verbenaceae) sobre mosquitos Aedes aegypti (Diptera-Culicidae)." Pós-Graduação em Biologia Parasitária, 2014. https://ri.ufs.br/handle/riufs/3257.

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Dengue is an important arboviral disease transmitted to humans through the bite of female mosquito Aedes aegypti. As there is no vaccine available, the control of disease occurs, mainly, by the reduction of mosquito population and personal protection to prevent contact between hosts and vectors. Given the increasing process of chemical resistance to insecticides, natural products emerge as safer alternatives for integrated control of endemic diseases. The aim of this work was to evaluate the larvicidal and repellent activities of essentials oils extracted from Xylopia laevigata, Xylopia frutes

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13

Shieh, Jong-neng. "Salivation and engorgement parameters of sucking insect vectors : implications in pathogen transmission." Thesis, 1994. http://hdl.handle.net/1957/35672.

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The probing behavior and feeding activity of green peach aphid, Myzus persicae Sulzer, on Bacillus thuringiensis ssp. tenebrionis- transgenic potatoes, insecticide treated potatoes, and host plants with different preference were electronically monitored. I found that first, transgenic potatoes had no effect on green peach aphid probing suggesting that transmission of green peach aphid-borne viruses would not be affected. Second, the probing behavior of green peach aphid was not modified by the insecticides, aldicarb, Admire, and Di-syston. However, the postfeeding behavior of aphids was differ

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14

Sether, Diane M. "Transmission efficiency and life table parameters of western flower thrips, Frankliniella occidentalis (Pergande) exposed to tomato spotted wilt virus-impatiens serotype." Thesis, 1991. http://hdl.handle.net/1957/36670.

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Peppermint, Mentha piperita 'Black Mitcham' was established as a host for tomato spotted wilt virus-impatiens serotype (TSWV-I). TSWV-I infection of peppermint, initially observed in a research greenhouse (Corvallis, OR), included stunting and downward curling of leaves accompanied by bronzing, and occasionally tip necrosis. Young leaves appeared either symptomless, deformed, or pale even under high nitrogen conditions. Older leaves had sunken, brownish-grey lesions. Bright yellow mottling was observed on newly mature deep green leaves. A begonia isolate of TSWV-I was transmitted to peppermint

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15

Orawu, Martin. "Occurrence of cowpea aphid-borne mosaic virus and prospects of improving resistance in local cowpea landraces in Uganda." Thesis, 2007. http://hdl.handle.net/10413/71.

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Viral diseases are a major limiting factor to cowpea production in many countries of Africa. In Uganda, studies indicated that the cowpea aphid-borne mosaic virus (CABMV) is common and a potential threat to cowpea production in the region. There have been no efforts to develop cowpea cultivars with resistance to CABMV in Uganda. This work focused on the development of cultivars resistant to CABMV. Production of cowpea in Uganda is constrained by several factors, including a lack of awareness of diseases among the majority of farmers. A participatory rural appraisal (PRA) was conducted to elici

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16

Ramavhale, Rollet Phindulo. "Seasonal abundance and diversity of insects on Sclerocarya birrea and Berchemia discolor in Tshikundamalema, Limpopo Province, South Africa." Diss., 2018. http://hdl.handle.net/11602/1198.

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MSCAGR (Plant Production)<br>Department of Plant Production<br>Indigenous trees play important roles in livelihoods for rural communities. Sclerocarya birrea and Berchemia discolor are indigenous in Africa and are used in rural communities for food and livestock feed, as well as for medicinal and construction purposes. These trees are subject to attack by insects, which can result in lower tree productivity. However, there is no documented information about insects found on both tree species in South Africa. This study investigated the seasonal abundance and diversity of insects on S. birrea a

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17

Ojwang', Pascal Peter Okwiri. "Genetic studies on host-plant resistance to bean fly (Ophiomyia spp.) and seed yield in common bean (Phaseolus vulgaris) under semi-arid conditions." Thesis, 2010. http://hdl.handle.net/10413/5330.

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Bean fly (Ophiomyia spp.) is a major pest of common bean (Phaseolus vulgaris L.) throughout eastern and southern Africa. In the semi-arid areas, apart from drought, the insect pest is reported to cause high crop losses up to 100%, particularly when drought occurs and under low soil fertility. Host-plant resistance is part of the integrated pest management strategies that have been widely employed against major insect pests of tropical legumes. However, information regarding its use in control of bean fly in common bean is limited. Therefore, the objectives of this study were to: (1) validate f

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18

Weier, Sina Monika. "Ecology and management of bat communities to increase pest control in macadamia orchards, Limpopo , South Africa." Thesis, 2019. http://hdl.handle.net/11602/1315.

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PhD (Zoology)<br>Department of Zoology<br>An ever growing human population and accelerating land use change is associated with the loss of species and their ecosystem services. Agricultural intensification has led to a worldwide threat of extinction to about one quarter of all bat species, despite the valuable ecosystem service of pest control provided by bats. The decline in bat populations is mainly attributed to the loss or fragmentation of habitats, roost sites and feeding opportunities related to agricultural intensification and land use change. Therefore, proactive management of ba

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19

Rinderknecht, Jennifer Murray Nancy Goshorn Murray Kristy O. "Perspectives on the public health implications of global climate change and the epidemiology of vector-borne disease." 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1467464.

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20

Mbowane, Clarah. "Efficacy evaluation of Mohlolo Insecticide Bait on German Cockroach, Blattella Germanica L." Thesis, 2014. http://hdl.handle.net/10386/1378.

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Thesis (M.Sc. (Plant Production)) -- University of Limpopo, 2014<br>In most cases the discipline plant protection is restricted to the protection of propagules, the plants and their produce in storage, while excluding the protection of processed (cooked) food from contaminants. Generally, the German cockroach (Blattella germanica L.) is a serious contaminant of processed food and had recently been viewed as a pest worthy of control in plant protection when viewing the entire value chain of agricultural commodities. Due to the nature of the pest, it is quite difficult to control using registere

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21

Dana, Pelisa. "Effect of soil factors on parasitic nematodes of sugarcane in KwaZulu- Natal, South Africa." Thesis, 2004. http://hdl.handle.net/10413/4210.

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Nematicides are not only expensive and unaffordable to small-scale farmers but are also harmful to the environment as they kill both the target organisms and non-target micro and macro-organisms, thereby destabilising the ecosystem. Most developed countries have or are in the process of banning use of chemicals for pest management, implying that agricultural products from developing countries using pesticides will not be marketed in the developed countries. In former studies, it was shown that plant parasitic nematodes posed serious problems in sugarcane fields as their attacks on sett roots d

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22

Lafaille, Norman R. "Relative susceptibility of endophytic and non-endophytic turfgrasses to parasitic nematodes /." 1998. https://scholarworks.umass.edu/theses/3471.

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23

Bertozzi, Terry. "Biology and control of the Anguinid nematode associated with flood plain staggers / by Terry Bertozzi." Thesis, 2003. http://hdl.handle.net/2440/22004.

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Examines the distribution, biology and ecology of the Anguina-type nematodes and the bacterium Rathayibacter toxicus which are associated with flood plain staggers, a disease similar to annual ryegrass toxicity. Possible pasture and livestock management options to control the disease are discussed, as is biological control using the fungus Dilophospora alopecuri.<br>Thesis (Ph.D.)--University of Adelaide, School of Agriculture and Wine, Discipline of Plant and Pest Science, 2003?

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24

Bertozzi, Terry. "Biology and control of the Anguinid nematode associated with flood plain staggers / by Terry Bertozzi." 2003. http://hdl.handle.net/2440/22004.

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Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Examines the distribution, biology and ecology of the Anguina-type nematodes and the bacterium Rathayibacter toxicus which are associated with flood plain staggers, a disease similar to annual ryegrass toxicity. Possible pasture and livestock management options to control the disease are discussed, as is biological control using the fungus Dilophospora alopecuri.<br>Thesis (Ph.D.)--University of Adelaide, School of Agriculture and Wine, Discipline of Plant and Pest Science, 20

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25

Mathebula, Dephney. "Multi-Scale Modelling of Vector-Borne Diseases." Thesis, 2018. http://hdl.handle.net/11602/1252.

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PhD (Mathematics)<br>Department of Mathematics and Applied Mathematics<br>In this study, we developed multiscale models of vector-borne diseases. In general, the transmission of vector-borne diseases can be considered as falling into two categories, i.e. direct transmission and environmental transmission. Two representative vector-borne diseases, namely; malaria which represents all directly transmitted vector-borne diseases and schistosomiasis which represents all environmentally transmitted vector-borne diseases were studied. Based on existing mathematical modelling science base, we est

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26

Ramutsa, Brenda Nyeverwai. "Integrating indigenous and scientific knowledge in community-based early warning system development for climate-related malaria risk reduction in Mopani District of South Africa." Thesis, 2020. http://hdl.handle.net/11602/1520.

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PhD (Geography)<br>Department of Geography and Geo-Information Sciences<br>Malaria is a climate-change concatenated biological hazard that may, like any other natural hazard, can lead to a disaster if there is a failure in handling emergencies or risks. A holistic solution for malaria mitigation can be provided when indigenous knowledge is complemented with scientific knowledge. Malaria remains a challenge in South Africa and Limpopo province is the highest burdened malaria-endemic region. Specifically, Vhembe District is the highest burdened followed by Mopani District (Raman et al., 2016). T

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