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Dissertations / Theses on the topic 'Forest pests and pathogens'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Petucco, Claudio. "Forest health economics : Management of forest pests and pathogens in conditions of global change." Thesis, Paris, Institut agronomique, vétérinaire et forestier de France, 2017. http://www.theses.fr/2017IAVF0007.

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Au cours des dernières décennies, la détérioration de la santé des forêts a entraîné des épidémies fréquentes des ravageurs et pathogènes. Ces phénomènes menacent la capacité des forêts à fournir des biens et services écosystémiques à la société. Il est donc nécessaire de maintenir la santé des arbres et de réduire les effets des parasites et des agents pathogènes. Cette thèse considère trois problèmes de gestion du point de vue économique : l'invasion actuelle, l'invasion attendue d'un agent pathogène, et les attaques d'un parasite endémique. À partir de ces trois problèmes de gestion, la thè

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Cobb, Richard C., Katinka X. Ruthrof, David D. Breshears, et al. "Ecosystem dynamics and management after forest die-off: a global synthesis with conceptual state-and-transition models." WILEY, 2017. http://hdl.handle.net/10150/626548.

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Broad-scale forest die-off associated with drought and heat has now been reported from every forested continent, posing a global-scale challenge to forest management. Climate-driven die-off is frequently compounded with other drivers of tree mortality, such as altered land use, wildfire, and invasive species, making forest management increasingly complex. Facing similar challenges, rangeland managers have widely adopted the approach of developing conceptual models that identify key ecosystem states and major types of transitions between those states, known as "state-and-transition models" (S&T

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3

Melander, Margareta. "Transgenic resistance to pathogens and pests /." Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a496.pdf.

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4

Sodja, Eric P. "Effects of Soil-Borne Pathogens on Seedling Establishment Patterns in Forest Systems." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7703.

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The Janzen-Connell mechanism is proposed to maintain plant diversity: predators and diseases of seeds reduce the number of seeds that survive near a parent tree, but allow seeds far from the parent tree to grow into adulthood. In the area where seeds don’t survive, seedlings from other tree species which are not affected by the seed consumer can grow. At large scales, this effect is thought to increase overall plant diversity. Soil-borne pathogens can contribute to seed mortality in this way, but we don’t know how important different parts of their lifecycle are in creating Janzen-Connell patt

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Van, Niekerk Jan Marthinus. "Characterisation of pathogens associated with trunk diseases of grapevines." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49879.

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Thesis (MScAgric )--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: In an attempt to combat some of the pathogens that are associated with trunk diseases and disorders of grapevines, research in this thesis focused on the taxonomy and pathological aspects of Coniellai/Pilidiella, Botryosphaeria and Phomopsis spp. Previously, conidial pigmentation was used to separate Pilidiella from Coniella. Recently, however, the two genera have been regarded as synonymous, with the older name, Coniella, having priority. The most important species in the Coniellai/Pilidiella complex of grapevines

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Bester, Wilma. "Characterisation and management of trunk disease-causing pathogens on table grapevines." Thesis, Stellenbosch : Stellenbosch University, 2006. http://hdl.handle.net/10019.1/21550.

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Thesis (MScAgric)--University of Stellenbosch, 2006.<br>ENGLISH ABSTRACT: Phaeomoniella chlamydospora, Eutypa lata, Phomopsis, Phaeoacremonium, and Botryosphaeria spp. are important trunk disease pathogens that cause premature decline and dieback of grapevine. Previous research has focused primarily on wine grapes and the incidence and symptomatology of these pathogens on table grapes were largely unknown. A survey was therefore conducted to determine the status and distribution of these pathogens and associated symptoms in climatically diverse table grape growing regions. Fifteen farms w

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7

au, nolad@iprimus com, and Nola Kim D'Souza. "Pathosystem development, characterisation and genetic dissection of the soil pathogen Phytophthora medicaginis and the model legume Medicago truncatula : a view to application of disease resistance in susceptible legume species." Murdoch University, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20090423.105414.

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Phytophthora medicaginis is an important soil-borne oomycete pathogen of lucerne (Medicago sativa) and chickpea (Cicer arietinum) within Australia and overseas. To understand the host/pathogen interaction, a pathosystem was developed using the model legume Medicago truncatula. Using the resources developed for genetics and molecular characterisation in this model plant, the aim of this research was to understand the interaction between M. truncatula and P. medicaginis, with a view to improving resistance to this important pathogen in related legumes. To observe and characterise the interactio

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8

Rabin, Daniel. "Using Computer Imaging to Assess Visual Impacts of Forest Insect and Disease Pests." DigitalCommons@USU, 1989. https://digitalcommons.usu.edu/etd/6446.

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Forest insect and disease pests alter the appearance of trees, thereby impacting visual resources. Because of the complexity of most forest landscapes, the degree of visual impact of pest-infested forest stands is difficult to quantify. This paper describes a method of measuring visual impacts of pest-infested forest stands. Photographs of healthy Ponderosa pine trees were entered into a computer video-image-processing system. Using this system, images of trees were altered to simulate different degrees of infestation by limb rust, a forest pathogen. The altered and unaltered images were shown

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9

Singh, Satya Ram, University of Western Sydney, of Science Technology and Agriculture Faculty, and School of Horticulture. "Biology of the rice leafroller Cnaphalocrocis (Marasmia) exigua (Butler) (Lepidoptera: Pyralidae: Pauristinae) in Fiji." THESIS_FTA_HOR_SINGH_S.xml, 1997. http://handle.uws.edu.au:8081/1959.7/443.

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The rice leafroller Cnaphalocrocis exigua (Butler) in the only species of the rice leaf folder/roller complex in Fiji. It is one of the major rice pests in the country, its pest status being exacerbrated by the cultivation of high-yielding varieties with minimal pest resistance. Detailed studies on the biology of the moth, in particular on the development, emergence, mating and flight behaviour, effect of adult nutrition on fecundity, egg hatchability and longevity, effect of larval nutrition on larval survival, pupation, pupal weight, pupal eclosion, and fecundity, egg hatchability and longev

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10

Schafer, Michelle. "Impacts of fungal pathogens on seeds of old-field species in meadow and forest habitats." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62907.pdf.

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11

Cloete, Mia. "Pome fruit trees as alternative hosts of grapevine trunk disease pathogens." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4169.

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Thesis (MScAgric (Plant Pathology))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: A survey was undertaken on apple and pear trees in the Western Cape Province to determine the aetiology of trunk diseases with reference to trunk diseases occurring on grapevine. Grapevine trunk diseases cause the gradual decline and dieback of vines resulting in a decrease in the vine’s capability to carry and ripen fruit. In recent years, viticulture has been expanding into several of the well established pome fruit growing areas. The presence of trunk pathogens in pome fruit orchards may affect

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Mohd, Salim @. Halim Jamilah. "Tree resistance and responsiveness to mechanical damage and fungal pathogens in dipterocarp forest of Sabah, Malaysia." Thesis, University of Aberdeen, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=130838.

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A survey of dipterocarp forest in four sites revealed that the incidence of stem canker was relatively low but high localized incidences were recorded. No consistent association was obtained between the presence of mechanical damage and cankers. Cankers occurred more frequently on dipterocarps and less frequently on euphorbs. Field studies and experimental manipulations were used to compare sapling resistance and responsiveness to wounding and stem breakage in relatively nutrient-rich, alluvial forest and relatively nutrient-poor, sandstone ridge forest. Species found on sandstone ridges showe

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Moyo, Mukani. "Molecular and phenotypic characterisation of grapevines expressing non-vinifera PGIP encoding genes." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6825.

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Thesis (MSc)--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Plants are constantly exposed to biotic and abiotic stress inducing factors that threaten their existence. Biotic factors such as pathogens are the cause of huge yield losses to crop plants worldwide with fungal pathogens debatably constituting the worst damage. Fungal pathogens such as Botrytis cinerea, which has a wide host range, release cell wall degrading enzymes called endopolygalacturonases (ePGs) during plant infection. These ePGs break down the pectin component of the cell wall, thus providing an entry route, as

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14

Daniel, Colin John. "Climate and outbreaks of the forest tent caterpillar in Ontario." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28957.

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A review of the current understanding of forest tent caterpillar (Malacosoma disstria Hbn.) population dynamics in Ontario suggests that two climatic factors, the temperature at the time of larval feeding and the minimum temperature through the winter, play important roles in determining outbreaks. Comparing the pattern of defoliation to similarly scaled temperature records over 41 years in Ontario shows no relationship between the year to year dynamics of outbreaks and either the temperature through the larval feeding period or the minimum overwintering temperature. A long-term analysis sugge

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15

Zapata, Mayta Edwin. "Diversity of insects from the Vespidae family in three ecological niches (forest, forest border, and agricultural area) in six communities in the Coroico and Coripata municipalities, department of La Paz." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/5455.

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The Vespidae family (order Hymenoptera) is comprised of 4500 species of wasps in 268 genera and 7 subfamilies. These wasps prey upon a wide range of insects, including Lepidopteran caterpillars. Because of their low prey specificity, the use of Vespid wasps in biological control programs is limited. However, in their natural habitat, they play a role in controlling populations of some pest species. This study was conducted in six different communities in the department of La Paz within the municipalities of Coroico and Coripata. Three ecological niches were selected in each community: 1) the f

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Smith, Thomas Ferguson. "Pathogens and plant community structure in an old-growth mixed-conifer forest of the Sierra Nevada, California /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

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17

Lemessa, Debissa. "Pests and pest controlling organisms across tropical agroecological landscapes in relation to forest and tree-cover." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-102849.

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A major challenge in agroecosystems is how to manage the systems so that it reduces crop pests and enhances natural pest control. This thesis investigates patterns of crop pests and top-down effects of birds and arthropod predators in relation to land-use composition across spatial scales. In paper (I) I examined the crop distribution and land-use types in relation to the crop raiding patterns in 15 transectsin sites close to and far from forests along with a questionnaire survey at household level. I found severe crop raiding close to forests, but it had no impact on crop composition growing

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18

Alfaro, R. I., and R. N. MacDonald. "Effects of Defoliation by the Western False Hemlock Looper on Douglas-Fir Tree-Ring Chronologies." Tree-Ring Society, 1988. http://hdl.handle.net/10150/261809.

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Annual rings of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, which sustained 1 year of defoliation by the western false hemlock looper, Nepytia freemanii Munroe (Lepidoptera: Geometridae), showed a period of decrease in breast height ring width starting in the year that followed the damage. The magnitude of the decrease was related to the degree of defoliation: there was no ring width decrease on trees that were 0-10% defoliated; the decrease became progressively more noticeable in trees which sustained increasingly higher defoliation; and it was maximum in trees which sustained 91-100%

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19

Wright, Gordon Tyler. "An Assessment of the Potential Impacts of Emerald Ash Borer (Agrilus planipennis Fairmaire) on Virginia's Municipal Street Trees." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/44186.

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Emerald ash borer (Agrilus planipennis Fairmaire) (EAB) is an invasive, wood-boring beetle (Coleoptera: Buprestidae) introduced unintentionally to the United States from East Asia that infests and eventually kills native ash trees (Fraxinus spp.). First detected near Detroit, Michigan in 2002, EAB had spread to fifteen U.S. states by 2011, killing an estimated 50 million ash trees along the way. EAB was first discovered in Virginia in 2003 and re-infested the state in 2008, raising concerns over impacts that the invasive pest might have on municipal urban forests and street trees. Despite t

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Wallertz, Kristina. "Pine weevil feeding in Scots pine and Norway spruce regenerations /." Alnarp : Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, 2009. http://epsilon.slu.se/200960.pdf.

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Neidermeier, Alexandra N. "Pacific Northwest To New England: Exploring The Intersections Of Invasive Ecology, Forest Management, And Alternative Energy." ScholarWorks @ UVM, 2020. https://scholarworks.uvm.edu/graddis/1174.

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Invasive species exact important ecologic, economic, and cultural tolls in forests. This research focused on the intersections of invasive ecology, forest management, and a forest commodity. Invasive ecology was explored through an assessment of two potential biological control agents of hemlock woolly adelgid. The two species of silver fly (Leucopis spp.) from the Pacific Northwest were first examined for temporal resource partitioning patterns. The niches of these species were then examined spatially by developing a species distribution model. Leucopis spp. exhibited sinusoidal patterns of d

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De, Beer Abre. "Overexpression and evaluation of an antimicrobial peptide from Heuchera sanguinea (Hs-AFP1) for inhibition of fungal pathogens in transgenic tabacco." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52983.

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Thesis (MSc)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: Seed germination is the most vulnerable time in a plant's life cycle, since the thick protective seed coat ruptures and the moist and humid soil environment not only favours seed germination, but also the growth and development of plant pathogens. Infection of plant seeds during germination, however, is the exception rather than the rule. Plant seeds have - - -developed a--cemplex preformed defense mechanism that includes anttfungal agents thatdiffuse into the surrounding environment to form a protective layer around th

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Van, Der Colff Dewidine. "Plant stress and the prevalence of pests and pathogens associated with a native and an invasive alien legume tree in the Cape Floristic Region, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86322.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Invasive alien plant species have devastating effects on the environments that they invade. Australian Acacias, a group of plants that has been planted globally for a range of uses, but has escape plantation areas and became invasive in many countries, are particularly problematic. Acacia mearnsii is one of these invasive alien plant species and in South Africa it is also an important forestry species. It is currently the fifth most widespread invasive alien plant in South Africa, only restricted by the very arid Karoo, thus it

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Lombard, Lorenzo. "Fungal diseases in Eucalyptus and Acacia nurseries in South Africa." Diss., University of Pretoria, 2004. http://hdl.handle.net/2263/24484.

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Studies presented in this dissertation highlight the importance of fungal pathogens in forestry nurseries in South Africa. Both Acacia meamsii seedlings and Eucalyptus hybrid cuttings are shown to be affected by important nursery pathogens. Chapter one presents an evaluation of the potential importance of pathogens to Eucalyptus hedge plants maintained in hydroponics. Hydroponics is a new technology being used in South African forest nurseries, which allows for the rapid establishment of Eucalyptus hedge plants. However, no information is available on pathogens affecting Eucalyptus in hydropon

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Carlander, Anneli. "Assessment of microbial health hazards associated with wastewater application to willow coppice, coniferous forest and wetland systems /." Uppsala : Department of Crop Production Ecology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200629.pdf.

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Tewoldemedhin, Yared Tesfai. "Characterisation of Rhizoctonia in cropping systems in the Western Cape Province." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/2269.

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Thesis (MScAgric (Plant Pathology))--University of Stellenbosch, 2005.<br>The genus Rhizoctonia includes important soilborne plant pathogens that can cause severe economic losses on a wide range of crops including cereal, canola, pasture and grain legume crops. Limited information is available on specific anastomosis groups (AGs), nuclear status, pathogenicity and cross-pathogenicity of Rhizoctonia isolates associated with each of these crops in the Western Cape province. Therefore, these aspects were investigated in this study, since information in this regard is crucial for the developm

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Gure, Abdella. "Seed-borne fungi of the afromontane tree species Podocarpus falcatus and Prunus africana in Ethiopia /." Uppsala : Dept. of Forest Mycology and Pathology, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/s334.pdf.

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Samnegård, Ulrika. "The impact of forest on pest damage, pollinators and pollination services in an Ethiopian agricultural landscape." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-126669.

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The distribution of wild biodiversity in agroecosystems affect crop performance and yield in various ways. In this thesis I have studied the impact of wild biodiversity, in terms of trees and forest structures, on crop pests, pollinators and the pollination services provided in a heterogeneous landscape in southwestern Ethiopia. Coffee, Coffea arabica, is a forest shrub native to Ethiopia and is grown in most wooded areas in the landscape where I conducted my studies. Wild coffee is still found in remote parts of the forests in the landscape. For my first paper, I surveyed pest damage on coff

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Menkis, Audrius. "Root associated fungi of conifer seedlings and their role in afforestation of agricultural land /." Uppsala : Dept. of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/2005106.pdf.

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Wallertz, Kristina. "Pine weevil Hylobius abietis feeding in shelterwood systems /." Alnarp : Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/10040784.pdf.

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Southwood, Michael J. "Evolution and detection of Fusarium oxysporum f. sp. cepae in onion in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2010. http://hdl.handle.net/10019.1/4499.

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Thesis (PhDAgric (Plant Pathology))--Stellenbosch University, 2010.<br>ENGLISH ABSTRACT: In the Western Cape onion industry in South Africa, Fusarium oxysporum Schlechtend.:Fr. f.sp. cepae (H.N. Hans.) W.C. Snyder & H.N. Hans. (Focep) has been identified as the leading cause of harvest and storage losses. This pathogen is of world-wide importance and causes Fusarium basal rot of onions (Allium cepa), affecting all onion growth stages. No information is available on the evolution, genetic diversity, molecular detection and inoculum sources of the South African Focep population. Similar t

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Garlet, Juliana. "LEVANTAMENTO POPULACIONAL DA ENTOMOFAUNA EM PLANTIOS DE Eucalyptus spp." Universidade Federal de Santa Maria, 2010. http://repositorio.ufsm.br/handle/1/8659.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>The cultivation of eucalipto has become an important economic activity in Brazil, due to its rapid growth, productive capacity, adaptability to different environments and great diversity of species, thus meeting the various sectors of industrial logging. However, with increasing areas of plantation Eucalyptus sp. entomological problems tend to increase in the same proportions. In this sense the population surveys are important because they make up one of the first steps of integrated pest management. Constant monitoring enables t

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O'Brien, Erin M. "Conserving Ash (Fraxinus) Populations and Genetic Variation in Forests Invaded by Emerald Ash Borer Using Large-scale Insecticide Applications." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492614729696552.

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Beversdorf, Matthew Arnold. "Forest pest management at Virginia Tech and environmental decision making at the Tennessee Valley Authority an internship /." Oxford, Ohio : Miami University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1082685478.

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Telles, Aline Mara dos Santos. "O uso de modelos matemáticos como ferramenta para avaliar a distribuição espacial de insetos-praga da cultura da soja no estado do Paraná." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2439.

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CAPES<br>Glycine max (L.) Merrill é uma das principais culturas agrícolas do país e integra um conjunto de atividades agrícolas com maior evidência no mercado mundial. Este trabalho objetiva determinar através de modelos em quais regiões do Estado Chrysodeixis includens Walker, 1858 (Lepidoptera: Erebidae), Anticarsia gemmatalis Hübner, 1818 (Lepidoptera: Erebidae), Euschistus heros Fabricius, 1794 (Hemiptera: Pentatomidae) e Nezara viridula Lineaus, 1758 (Hemiptera: Pentatomidae) tem maior ocorrência, bem como analisar possíveis influências sobre uma mudança na distribuição populacional. Fora

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Wessels, Andries Bernardus. "Genetic characterization and fungicide resistance profiles of Botrytis cinerea in rooibos nurseries and pear orchards in the Western Cape of South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20070.

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Thesis (MScAgric)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Botrytis cinerea Pers. Fr. [teleomorph Botryotinia fuckeliana (de Bary) Whetzel] causes serious losses of over 200 crops worldwide, including rooibos seedlings and pears. This pathogen is characterized by morphological, physiological and genetic diversity. The genetic diversity and population structure have not been investigated for B. cinerea populations in South Africa. Botrytis cinerea collected from rooibos seedlings and in pear orchards in the Western Cape of South Africa were investigated in the present study. T

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Muleta, Diriba. "Microbial inputs in coffee (Coffea arabica L.) production systems, southwestern Ethiopia : implications for promotion of biofertilizers and biocontrol agents /." Uppsala : Dept. of Microbiology, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/2007117.pdf.

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Van, Coller Gerhardus J. (Gerhardus Johannes). "An investigation of soilborne fungi associated with roots and crowns of nursery grapevines." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49844.

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Thesis (MScAgric)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: Soilborne diseases of grapevines represent a complex problem with limited information available, both locally and internationally. Previous research in South Africa indicated that Phytophthora and Pythium spp. were the most widespread and devastating pathogens in grapevine nurseries and vineyards in the Western Cape province. The local grapevine industry is currently expanding; new cultivars, methods and agricultural chemicals are being used which can affect soilborne pathogens. It has therefore become necessary to

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Dynes, Robyn A. "Factors causing feed intake depression in lambs infected by gastrointestinal parasites." Lincoln University, 1993. http://hdl.handle.net/10182/2174.

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A reduction in voluntary feed intake is a major factor in the lost productivity of grazing lambs infected by gastrointestinal parasites yet the mechanisms involved are poorly understood. Potential pathways involved in parasite-induced feed intake depression were investigated in lambs with minimal previous exposure to parasites and artificially infected by the small intestinal parasite Trichostrongylus colubriformis. Six in vivo experiments were conducted on lambs housed in individual pens or metabolism crates with similar feeding and experimental procedures. In Experiment 1 (Chapter 4) the ef

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Zhou, Huitong. "Genetic variation in Dichelobacter nodosus Fimbriae." Lincoln University, 2001. http://hdl.handle.net/10182/2244.

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Footrot is a contagious hoof disease of ruminants. It is endemic in New Zealand and throughout sheep and goat farming regions of the world. The disease results from a mixed bacterial infection, but the essential agent is Dichelobacter nodosus, a Gram-negative, anaerobic bacterium that possesses type-IV fimbriae on its surface. Genetic variation in the fimbriae of D. nodosus was investigated in this study. Using the polymerase chain reaction (PCR), the variable region of the gene encoding the fimbrial subunit (fimA) was amplified from bacterial DNA extracted from footrot lesions. Different fim

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Prattley, Deborah Jayne. "Risk-based suveillance in animal health : a thesis presented in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Massey University, Palmerston North, New Zealand." Massey University, 2009. http://hdl.handle.net/10179/1011.

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Animal health surveillance is an important part of animal health care, particularly in countries dependent on livestock for food production and international trade. There are two major issues related to the provision of e®ective surveillance activities. Firstly, for good information to become available, the design and conduct of data collection activ- ities should be carried out following sound statistical principles. In reality, constraints such as imperfect tests and unavoidably-biased sampling strategies hinder straightfor- ward analysis and interpretation of survey results. Risk-based surv

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Benschop, Jacqueline. "Epidemiological investigations of surveillance strategies of zoonotic Salmonella : a dissertation presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy at Massey University." Massey University, 2009. http://hdl.handle.net/10179/1025.

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This thesis is concerned with the application of recently developed epidemiological and statistical tools to inform the optimisation of a national surveillance strategy of considerable importance to human health. The results of a series of epidemiological investigations of surveillance strategies for zoonotic Salmonella are presented. Salmonella are one of the most common and serious zoonotic foodborne pathogenic bacteria globally. These studies were motivated by the increasing focus on the cost-effectiveness of surveillance while maintaining consumer confidence in food supply. Although data f

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Petersson, Magnus. "Regeneration methods to reduce pine weevil damage to conifer seedlings /." Alnarp : Southern Swedish Forest Research Centre, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/s330.pdf.

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Lisboa, Mirne Santana. "Subsídios técnicos para elaboração de plano de contingência para o besouro asiático Anoplophora glabripennis (Motschulsky)." Universidade Federal de Viçosa, 2014. http://locus.ufv.br/handle/123456789/5876.

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Made available in DSpace on 2015-03-26T13:58:41Z (GMT). No. of bitstreams: 1 texto completo.pdf: 912261 bytes, checksum: dff375c92caec2fa9d74d1caef54e18c (MD5) Previous issue date: 2014-01-28<br>Anoplophora glabripennis (Motschulsky) (Coleoptera: Cerambycidae) is native to China and is the latest example of great economic, environmental and social impact of a forest pest introduced into a new environment. The forest pests are transported by material propagation and solid wood packaging material (SWPM) used in accommodating cargo in the international trade. It is estimated that pests are resp

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Greer, Andrew W. "Estimates of the nutritional cost of the development of immunity to gastrointestinal parasites in sheep." Lincoln University, 2005. http://hdl.handle.net/10182/11.

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This thesis describes a series of three experiments designed to estimate the nutritional cost of the immune response to the gastrointestinal nematodes Trichostrongylus colubriformis and Teladorsagia circumcincta in sheep. For each experiment, animals were allocated hierarchically by liveweight into one of four groups that were either infected (group IF), similarly infected and concurrently immuno-suppressed with weekly intramuscular injections of 1.3mg kg liveweight (LW)⁻¹ of methylprednisolone acetate (group ISIF), immunosuppressed only (group IS) or remained as controls (group C). Body compo

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Ribeiro, Raquel Rossi. "Beauveria bassiana Vuill. (Ascomycetes: Clavicipitaceae) sobre Thaumastocoris peregrinus Carpinteiro & Dellapé (Hemiptera: Thaumastocoridae)." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2208.

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O percevejo-bronzeado do eucalipto, Thaumastocoris peregrinus, é um inseto fitófago que ocasiona o amarelecimento das folhas de Eucalyptus e, em casos severos, a desfolha e morte das plantas. Buscam-se formas de controle natural e/ou biológico para o controle deste inseto. Nesta perspectiva, o controle biológico vem ganhando espaço e o emprego de fungos entomopatogênicos torna-se viável, uma vez que já ocorre naturalmente no ambiente. Nesse sentido, objetivou-se avaliar a ação do fungo entomopatogênico B. bassiana, isolado IBCB 66 sobre diferentes fases de desenvolvimento de T. peregrinus, em

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Cedervind, Jan. "Impact of pine looper defoliation in Scots pine : secondary attack by pine shoot beetles, tree mortality, top-kill, growth losses, and foliage recovery /." Uppsala : Dept. of Entomology, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/s297.pdf.

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Morton, J. D. "The effect on protein synthesis in barley of infection with P. hordei." Lincoln College, University of Canterbury, 1989. http://hdl.handle.net/10182/1950.

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Infection of barley (Hordeum vulgare) leaves with the rust fungus, Puccinia hordei, causes changes in the host protein synthesis. This thesis analyses these changes in the barley cultivar Triumph following inoculation of 7-day-old leaves with either a virulent or an avirulent race of P. hordei. The initial approach was to isolate membrane-bound polysomes from infected leaves, translate them in vitro and analyse the translation products. These products include the integral membrane proteins which were expected to be involved in the response of the host to the pathogen. A method based on differ

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Iposu, Shamsideen Oladeinde. "Effect of suckling on response to nematode parasites in young lambs." Diss., Lincoln University, 2007. http://hdl.handle.net/10182/115.

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The series of experiments described in this thesis were designed to investigate the role of suckling or late weaning in the response of young lambs to nematode infection. All experiments were conducted outdoors with grazing animals and no supplementation but for suckled groups of lambs whose counterparts were weaned to ryegrass – white clover swards. The parasite of interest was mainly Teladorsagia circumcincta solely but with mixed infection of Trichostrongylus colubriformis in one instance. In Chapter 3 (first experiment), the hypothesis that milk per se may have a direct effect on nematode

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Meurisse, Nicolas. "Chemical ecology of rhizophagus grandis (Coleoptera: Monotomidae) and its application to the biological control of dendroctonus micans (Coleoptera: Scolytinae)." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210567.

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The Eurasian spruce bark beetle Dendroctonus micans is a major pest of spruce which is expanding its range in France, Turkey, England and Wales. Its monospecific predator Rhizophagus grandis has followed naturally the bark beetle into most areas and, since the 1960s, has also been mass-produced and successfully released within newly infested locations. <p>In this scope, the development of an effective trapping method would be very useful to assess the bark-beetle presence at previously uninfested sites, or predator establishment after release or natural spread. We demonstrated the efficiency o

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