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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 132 for “"parasitoid"”.
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The effect of aphids in parasitoid-caterpillar-plant interactions
… between herbivores, their host plants and their parasitoids. However, the relationships between parasitoids and herbivore hosts have typically been studied in isolation of other herbivore species. I examined how the outcomes of species interactions change when multiple relationships are …
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Identification of genes from the poxvirus of a parasitoid wasp
… the accessory poison gland apparatus of a female parasitoid wasp, D. longicaudata. The wasp apparently injects DlEPV into host fly larvae along with the egg during oviposition. Although the effect of the presence of DlEPV on wasp larvae survival within the host is unknown, the virus does appear to …
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Genomic insights into the evolution of the parasitoid Microctonus aethiopoides
Parasitoids are used as biocontrol agents in classical biological control programmes for controlling invasive pest populations. In Aotearoa New Zealand, there are two strains of Microctonus aethiopoides that have been used against two serious pest weevils of the Sitona group. However, there is …
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Genetics and Evolution of Drosophila Humoral Immunity against Parasitoid Infections
The parasitoid wasp Leptopilina boulardi is a major natural parasite of Drosophila melanogaster. However, the regulation of Drosophila humoral immunity against parasitoids is not clearly illustrated. In this thesis, I investigated the humoral immune mechanisms underlying Drosophila resistance to …
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Environmental effects of insecticides on non target predator and parasitoid insects
… which reduce the efficacy of the predators and parasitoids in reducing pest insects. The physiological sublethal effects can result in reduced longevity and reproduction. Understanding the sublethal effects of insecticides on beneficial insects is important in agroecosystems, especially in the …
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Host-Parasitoid Interactions of Two Invasive Drosophilids in Virginia Fruit Crops
1.) Sentinel traps were used to survey for parasitoids of frugivorous drosophilids in Virginia fruit cropping systems, and determine if parasitoids were attacking invasive flies Drosophila suzukii (Matsumura) and Zaprionus indianus Gupta (Diptera: Drosophilidae) in the field. Two parasitoids of …
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Spatial ecology of food webs : herbivore-parasitoid communities on the pedunculate oak
… few decades. In this thesis, I study herbivore-parasitoid food webs from a new perspective: I construct multiple, quantitative food webs in a spatially explicit setting, at two different scales. Focusing on food webs consisting of specialist herbivores and their natural enemies on the …
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Mathematical models for host-parasitoid interactions and biological control of Drosophila suzukii
This thesis treats mathematical models for host-parasitoid interactions. It is composed of three parts. In the first part, a class of such models is analyzed theoretically. It focuses on the phenomena of multiple coexistence equilibria of competing parasitoid species. The second part is about a …
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Patterns of association in a co-introduced insect herbivore and parasitoid wasp
… Lepidoptera: Depressariidae), and its primary parasitoid, Copidosoma sosares (Hymenoptera: Encyrtidae) to address the importance of shared population history and ecological fitting in shaping species interactions in introduced ranges. The coevolved reciprocal interaction between wild parsnip, …
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The Developmental Biology of Euplectrus Platyhypenae Howard (Hymenoptera: Eulophidae), a Parasitoid of Pseudaletia Unipuncta (Haw.) (Lepidoptera: Noctuidae), and the Effects of a Microsporidian Disease of the Host on the Parasitoid
Made available in DSpace on 2014-12-14T07:04:04Z (GMT). No. of bitstreams: 1 7821013.pdf: 2359330 bytes, checksum: 3225ff66c19286baa7b9cb85e3452e5e (MD5) Previous issue date: 1978
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Genetic differentiation of the parasitoid, Cotesia congregata (Say), based on host-plant complex
Endoparasitoids of herbivorous lepidopterans have intimate relationships with their host species as well as the plant on which their host develops. Characteristics of both hosts and plants can affect parasitoid success in tri-trophic systems and thus, drive diversification. Genetic differentiation …
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Understanding Virulence Mechanisms of Parasitoid Wasps of Drosophila: A Comparative Approach Across Clades
… of many <em>Drosophila</em> species encapsulate parasitoid wasps’ eggs to inhibit wasp development. Parasitoid wasps of the genus <em>Leptopilina</em> are known to produce extracellular vesicle (EV)-like secretions in their venom. Well-characterized in <em>L. heterotoma</em>, these vesicles kill …
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Phylogenetics patterns of host utilization in two tropical Microgastrine parasitoid genera (Hymenoptera: Braconidae)
Parasitoid wasps play a pivotal role in maintaining the structure and dynamics of complex food webs. However, classical species sampling techniques such as malaise, light and yellow pan trapping, generally lack information regarding host utilization. Even within the species for which host data is …
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Factors influencing populations of the fig pollinator (Liporrhopalum tentacularis) and its parasitoid (Sycoscapter sp.)
… figs, suggesting that the latter might not be a parasitoid. However, in experiments where the numbers of pollinators entering a fig was controlled, Sycoscapter sp. significantly reduced the number of pollinators. It is suggested that Sycoscapter sp.is a parasitoid, or inquiline. It also did not …
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Integrating Molecular, Ecological and Morphological Data to Explore the Biodiversity of Microgastrine Parasitoid Wasps
… explored in the context of the caterpillar and parasitoid inventory of the Area de Conservacion Guanacaste (ACG) in Costa Rica. To understand species relationships and patterns in host utilization, a phylogeny was reconstructed for Apanteles, the largest genus. A five-gene phylogeny recovered a …
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Effects of Plant Damage, Herbivore-Associated Cues, and Learning on Foraging Behavior of a Parasitoid Wasp
… behavior, using the interaction between the parasitoid <em>M. croceipes</em>, cotton <em>Gossypium</em> <em>hirsuium</em> L. (Malvales: Malvaceae), and host larvae <em>Helicoverpa</em> <em>zea</em>(Boddie) (Lepidoptera: Noctuidae) as a tritrophic model. Twenty-five cotton plants were arranged …
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Patch exploitation and defence in the egg parasitoid Trissolcus basalis Wollaston (Hymenoptera : Scelionidae) / Scott A. Field.
Trissolcus basalis (Wollaston) is a solitary endoparasitoid of the eggs of many pentatomid bugs. It is a quasi-gregarious scelenoid and aggressively defends host patches. In the Adelaide (S. Aust.) region its most abundant host is the native horehound bug, Agonoscelis rutila (Fabricius). This study …
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Stink bug egg studies in southeastern Virginia: parasitoid survey, and susceptibility and chorion permeability to insecticides
… to insecticides. A survey of stink bug egg parasitoids was conducted in row crops and vegetables in eastern Virginia. Parasitization was highest in Euschistus servus (Say) with 89.7% and 49.2% of egg masses and individual eggs parasitized, respectively, followed by Acrosternum hilare (Say), …
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