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Showing 1 to 10 of 10 for “"Parasitic wasp"”.
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"Molecular Analysis of Virulence Factors Unique to Leptopilina heterotoma-a Parasitic Wasp of Drosophila spp."
<p>Endoparasitioid wasps of Drosophila spp. frequently avoid or overcome the immune defense mechanisms of their fly hosts. Leptopilina heterotoma (Lh) is a generalist wasp species, successful on many Drosophila spp. world-wide. During oviposition, the female wasp introduces venom proteins and …
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Multiscale Image Analysis for the Automated Localisation of Taxonomic Landmark Points and the Identification of Species of Parasitic Wasp
… points and the identification of species of parasitic wasps of the order Hymenoptera using SEM images of their heads. These images present significant analysis problems. Image feature extraction techniques investigated to solve this problem<br/>include deformable contour models, texture …
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Learning and Olfactory Processing by the Parasitic Wasp, Cotesia Congregata, In Response to Concentration of Herbivore Related Tomato Volatiles
… attraction is dose dependent, that parasitoid wasps use elemental processing during learning, and that the concentration during learning of herbivore-related plant volatiles affects attraction responses were tested using a novel technology which controlled the concentration of herbivore-related …
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Investigation of pre- and post-zygotic reproductive barriers between two host-plant complex races of the parasitic wasp Cotesia congregata (Say) [Hymenoptera: Braconidae]
Investigations of host-associated differentiation of parasitoids have largely focused on the degree of molecular genetic differentiation, but a true test of species status must examine the mating patterns of differentiated populations to determine if they can interbreed in the wild and produce …
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Diversity and relationships of South Africa's fig-associated nematodes
Parasitic nematodes of the fig microcosm have received limited attention in South Africa. I have assessed the molecular diversity of nematodes present in the native South African species and discovered 24 undescribed species. Two were previously described but the descriptions need reviewing. I have …
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Influences of Climate, Competition, and Novel Hosts on Parasitoids of Emerald Ash Borer, and their Establishment in Virginia, and North Carolina
… Studies in to Asia discovered several species of parasitic wasps which feed and reproduce on emerald ash borer; four of these species were approved for release in the United States. Three species which attack emerald ash borer larvae Tetrastichus planipennisi Yang (Hymenoptera: Eulophidae), …
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Factors influencing the control of the Sirex woodwasp in South Africa
The woodwasp Sirex noctilio is one of the most serious invasive pests of Pinus plantations in the southern hemisphere. Extensive control programs have been developed to manage this pest, of which biological control has been a major component. This thesis examined the factors that could influence …
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The genetics of species differences within the genus Nasonia ASHMEAD 1904 (Hymenoptera: Pteromalidae)
… when hybrids experience a fitness reduction. The parasitic wasp genus Nasonia represents an appropriate model system to investigate the genetics of species differences as well as the genetics of postzygotic isolation. The genus consists of three species N. vitripennis, N. longicornis and N. …
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Effects of Plant Damage, Herbivore-Associated Cues, and Learning on Foraging Behavior of a Parasitoid Wasp
<p>Behavioral assays of the parasitic wasp <em>Microplitis croceipes</em> Cresson (Hyrnenoptera: Braconidae) were made at the Coastal Plain Experiment Station, Tifton, GA during the summer of 2001, in a screened in mesh with a 5 X 5 cotton patch. I quantified the influence of plant and …
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Evidence for Organelle-Like Extracellular Vesicles from a Parasite of Drosophila and Their Function in Suppressing Host Immunity
<p>Parasitic wasps act as keystone species in natural ecosystems. Adept at suppressing immunity of their insect hosts, these natural enemies of insect pests are used for biocontrol in many parts of the world. Female parasitic wasps of the closely-related species <em>Leptopilina heterotoma</em> …