Thesis (Ph.D.)--University of Adelaide, Dept. of Applied & Molecular Ecology, 2002. / Bibliography: leaves 113-144.

Thesis (Ph. D.)--University of Canterbury, 2008. / Typescript (photocopy). "November 2008." Includes bibliographical references (p. 167-182). Also available via the World Wide Web.

Thesis (M. Sc. (Zoology & Entomology))--Rhodes University, 2004.

Dissertation (PhD(Agric)--University of Stellenbosch, 2008. / Bibliography. Also available via the Internet.

Thesis (M.S.)--Montana State University--Bozeman, 2006. / Typescript. Chairperson, Graduate Committee: David K. Weaver. Includes bibliographical references (leaves 105-112).

Bibliography: leaves 108-128. Maternal protein secretions from the parthenogenetic endoparasitoid wasp Venturia canescens Gravenhorst (Hymenoptera: Ichneumonidae) were analysed regarding their ability to protect the parasitoid egg against the host immune system. These secretions include nucleic acid-free glycoproteins, called virus-like particles (VLPs) that are produced in the ovarian calyx gland. Results found that VLP-free calyx fluid has the ability to actively suppress host defence reactions, rather than VLPs on the egg surface being solely responsible for the protection of the egg. It was shown the VLP-free calyx fluid contains serine protease-inhibitor activity capable of transiently inhibiting melanogenisis and hemocyte spreading in the host. This indicates that immediately after oviposition the egg surface is not fully protected against host defence reactions. However, at later stages the egg seems to have acquired an immunologically inert surface, and is therefore protected after the suppressive activity of the calyx fluid has disappeared.

"February 2005" / Includes bibliographical references. / 1 v. (various paging) : ill., plates ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / It has recently been shown that a thelytokous laboratory culture of the parasitoid wasp Venturia canescens contains two genetically distinct lines, coexisting on their host, the flour moth Ephestia kuehniella. The primary aim of the research presented in this thesis was to determine the basis of the coexistence of the two wasp strains, and estimate whether it is an artefact of the laboratory rearing conditions, or could, in principle, occur in field populations. / Thesis (Ph.D.)--University of Adelaide, School of Agriculture and Wine, Discipline of Plant and Pest Science, 2005

Thesis (M.S.)--Rhodes University, 2004. / Title from PDF t.p. (viewed on Apr. 30, 2006). Includes bibliographical references (p. 81-92).

Made available in DSpace on 2014-06-11T19:25:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-02-28Bitstream added on 2014-06-13T20:32:39Z : No. of bitstreams: 1 viana_ma_me_jabo.pdf: 561645 bytes, checksum: 0c2745a64509b4dad56b0591f7e32d50 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O objetivo do trabalho foi estudar a performance de Trichogramma exiguum e Trichogramma pretiosum, em ovos de populações de Plutella xylostella sob ação de a Bacillus thuringiensis. O experimento constou de quatro tratamentos por parasitoide, sendo: ovos da população suscetível (Ps) a Bt com mais de 100 gerações em laboratório (Testemunha); ovos da população submetida à pressão de seleção ao isolado HD-1 por mais de 40 gerações (Res); ovos da Ps pulverizados com HD-1 e ovos da Ps pulverizados com o isolado T08.024. As fêmeas foram individualizadas e alimentadas com uma gotícula de mel. Os testes realizados foram avaliados: a resposta funcional, capacidade de parasitismo, tabela de vida e teste de preferência. Para análise de resposta funcional foram testadas as densidades de 2, 4, 8, 16, 32 e 64 ovos, e a melhor densidade utilizada para os demais testes, utilizando as densidades de 32 e 8 para T. pretiosum e T. exiguum respectivamente. Os parâmetros avaliados foram: parasitismo, viabilidade, razão sexual, longevidade e período ovo-adulto. B. thuringiensis afeta os ovos de P. xylostella influenciando o parasitismo de Trichogramma sp., de maneira positiva ou negativa dependendo do isolado utilizado. A interação Trichogramma-Bt pode sofrer alterações de acordo com a espécie do parasitoide utilizada e do isolado de Bt, sendo necessário estudo das interações especificas antes de seu uso em conjunto / This research aimed the study of the performance of Trichogramma exiguum and Trichogramma pretiosum in eggs of Plutella xylostella populations under the action of Bacillus thuringiensis (Bt). The experiments consisted of four treatments for each parasitoid, as follows: eggs of the susceptible population (Ps) to Bt with more than 100 generations in the laboratory (Witness), eggs of the population subjected to selection pressure to isolate HD-1 for more than 40 generations (Res); Ps eggs sprayed with HD-1 and eggs of Ps sprayed with isolate T08.024. The females were individualized and fed with a drop of honey. Some parameters were evaluated: the functional response, parasitism capacity, life table and preference test. For analysis of functional response the densities of 2, 4, 8, 16, 32 and 64 eggs were tested, and the best densities were used for other tests, that were, 32 and 8 eggs for T. pretiosum and T. exiguum respectively. The parameters evaluated were: parasitism, viability, sex ratio, longevity and egg-adult period. Bacillus thuringiensis affected the eggs of Plutella xylostella influencing parasitism of Trichogramma sp., positively or negatively, depending on the isolate used. The interaction Trichogramma-Bacillus thuringiensis may change according to the species of parasitoid and the Bt strain used, it is necessary to study the specific interactions prior to use their two agents together

Orientador: Sérgio Antonio de Bortoli / Coorientador: Ricardo Antonio Polanczyk / Banca: Arlindo Leal Boiça Júnior / Banca: Fernando Hercos Valicente / Resumo: O objetivo do trabalho foi estudar a performance de Trichogramma exiguum e Trichogramma pretiosum, em ovos de populações de Plutella xylostella sob ação de a Bacillus thuringiensis. O experimento constou de quatro tratamentos por parasitoide, sendo: ovos da população suscetível (Ps) a Bt com mais de 100 gerações em laboratório (Testemunha); ovos da população submetida à pressão de seleção ao isolado HD-1 por mais de 40 gerações (Res); ovos da Ps pulverizados com HD-1 e ovos da Ps pulverizados com o isolado T08.024. As fêmeas foram individualizadas e alimentadas com uma gotícula de mel. Os testes realizados foram avaliados: a resposta funcional, capacidade de parasitismo, tabela de vida e teste de preferência. Para análise de resposta funcional foram testadas as densidades de 2, 4, 8, 16, 32 e 64 ovos, e a melhor densidade utilizada para os demais testes, utilizando as densidades de 32 e 8 para T. pretiosum e T. exiguum respectivamente. Os parâmetros avaliados foram: parasitismo, viabilidade, razão sexual, longevidade e período ovo-adulto. B. thuringiensis afeta os ovos de P. xylostella influenciando o parasitismo de Trichogramma sp., de maneira positiva ou negativa dependendo do isolado utilizado. A interação Trichogramma-Bt pode sofrer alterações de acordo com a espécie do parasitoide utilizada e do isolado de Bt, sendo necessário estudo das interações especificas antes de seu uso em conjunto / Abstract: This research aimed the study of the performance of Trichogramma exiguum and Trichogramma pretiosum in eggs of Plutella xylostella populations under the action of Bacillus thuringiensis (Bt). The experiments consisted of four treatments for each parasitoid, as follows: eggs of the susceptible population (Ps) to Bt with more than 100 generations in the laboratory (Witness), eggs of the population subjected to selection pressure to isolate HD-1 for more than 40 generations (Res); Ps eggs sprayed with HD-1 and eggs of Ps sprayed with isolate T08.024. The females were individualized and fed with a drop of honey. Some parameters were evaluated: the functional response, parasitism capacity, life table and preference test. For analysis of functional response the densities of 2, 4, 8, 16, 32 and 64 eggs were tested, and the best densities were used for other tests, that were, 32 and 8 eggs for T. pretiosum and T. exiguum respectively. The parameters evaluated were: parasitism, viability, sex ratio, longevity and egg-adult period. Bacillus thuringiensis affected the eggs of Plutella xylostella influencing parasitism of Trichogramma sp., positively or negatively, depending on the isolate used. The interaction Trichogramma-Bacillus thuringiensis may change according to the species of parasitoid and the Bt strain used, it is necessary to study the specific interactions prior to use their two agents together / Mestre