Global ETD Search
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 19 of 19 for “"plant volatiles"”.
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Olfactory responses of Dasineura Dielsi Rübsaamen (Diptera: Cecidomyiidae) females to host plant volatiles
… a biological control agent on the invasive alien plant species, Acacia cyclops (Mimosaceae). An investigation was launched to test the following hypotheses: 1) the midges respond to the scent of A. cyclops to locate suitable oviposition sites; 2) the floral scent of A. melanoxylon, A. longifolia …
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Effects of habitat and plant volatiles on mosquito spatial, seasonal, and chemical ecology
… which allows a mosquito to differentiate between plant nectar, required for metabolic processes, and host odors, which will help them navigate towards hosts, source of the blood required for producing eggs. Mosquitoes interpret and respond to chemical volatiles very differently depending on their …
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Learning and Olfactory Processing by the Parasitic Wasp, Cotesia Congregata, In Response to Concentration of Herbivore Related Tomato Volatiles
<p>Learned attraction to herbivore-related plant volatiles provides a simple but effective mechanism to increase parasitoid foraging effectiveness. Hypotheses that learned attraction is dose dependent, that parasitoid wasps use elemental processing during learning, and that the concentration during …
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Investigating host plant selection of harlequin bug, Murgantia histrionica (Hahn), in order to improve a trap cropping system for its management
… olfactometer choice tests, male HB responded to plant volatiles of bean, collard and mustard, but preferred Brassica volatiles over those from bean. Female response to plant volatiles alone was weak and inconsistent. Both males and females preferred volatiles from other males feeding on Brassica …
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Biochemical Separation of Geographical Strains of Plum Curculio, Conotrachelus nenuphar (Herbst) (Coleoptera: Curculionidae), and Evaluation of Olfactory Attractants in Virginia Orchards
… trap designs baited with grandisoic acid, plant volatiles, and a combination of pheromone and plant volatiles were tested. In 1999, significantly more plum curculios were captured with Tedders traps baited with grandisoic acid and unbaited control in traps baited with limonene, plum essence …
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Investigations of the integrated pest management of Colorado potato beetle, Leptinotarsa decemlineata (Say): Host plant preference, development of semiochemical-based strategies, and evaluation of a novel insecticide
… in pest management. To better understand host plant selection by CPB, field and laboratory-choice experiments were conducted in Virginia. In laboratory studies, CPB preferred potato over both tomato and eggplant foliage and eggplant over tomato foliage. However, field studies using counts of …
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Integrated Multiple-tactic Management of the Redbanded Stink Bug on Soybeans in Louisiana
… to determine the combined effects of host plant resistance and insecticide application, on the abundance of stink bugs and their natural enemies. The soybean cultivar Pioneer 95Y20 had the least pest pressure, seed damage, and yields were higher from these plants. Insecticide application of …
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Biotic and abiotic mechanisms shaping multi-species interactions
… rainforest in Costa Rica and focus on one plant genus, Piper (Piperaceae). The final data chapter (Chapter 5) was conducted within a working landscape of soybean (Glycine max) fields in eastern Maryland, USA. In Chapter 2, I explore intra- and inter-specific dietary niche partitioning of …
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Circadian rhythms and effects of different diets on the development and reproduction of Nabis Kinbergii (Hemipteria : Nabidae).
… conditions, they would spend more time moving on plants at night. They spent less time moving than other activities. Furthermore, they were more active during the second day of the observations, probably because of the hunger. A mixed diet including Plutella xylostella, Myzus persicae and …
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Chemoreceptors From the Hawk Moth Manduca Sexta L
… it functions as a general Or, perhaps tuned to plant volatiles. A gustatory receptor was sequenced from the labial palp mRNA of M. sexta using degenerate inosine primers designed to the conserved motifs of two gustatory receptors found in the Anopheles gambiae and Drosophila melanogaster …
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Disrupting insect-mediated transmission of plant viruses
Many plant viruses are vectored by aphids in the non-persistent mode, in which virus particles are transported on these insects’ specialised piercing mouthparts (stylets). Virus infection can change plant-vector interactions and it is thought that this may accelerate virus transmission. To better …
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Toward developing pheromone emitting trap crops: Metabolic engineering of an aggregation pheromone for enhanced attraction of Phyllotreta cruciferae
… pest management tools that use insect and/or plant volatiles to reduce pest populations on crops of interest. Generating pheromone-emitting trap plants may allow for a continuing and highly-specific attraction of insect pests without repeated and costly application of synthetic pheromones. …
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Studies of the mechanisms involved in host finding and mating behaviour of the African coffee white stem borer, Monochamus leuconotus (pascoe) (Cleoptera: Cerambycidae)
… between conspecific beetles and host plants. Mating behaviour and daily activity patterns of adult M. leuconotus were characterised under laboratory and semifield conditions. Mating was initiated after the male encountered a searching female and touched her with antennae or tarsi. The …
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Allee effects and the persistence of small populations
… N. ogloblini potentially utilize feeding-induced plant volatiles as a cue to find their host, thereby increasing dispersal success among host patches and aggregation on host plant patches. As the Allee effect plays an important role in the dynamics of newly established and low-density populations …
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Biochemical and Functional Characterization of Induced Terpene Formation in Arabidopsis Roots
Plants have evolved a variety of constitutive and induced chemical defense mechanisms against biotic stress. Emission of volatile compounds from plants facilitates interactions with both beneficial and pathogenic organisms. However, knowledge of the chemical defense in roots is still limited. In …
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Factors affecting the response of thrips to an olfactory cue
… Because a large number of insects utilize plant volatiles in host finding, there is growing interest in exploiting the olfactory cues that insects use to find their hosts, including the use of semiochemicals as attractants in pest management. However, our understanding of the mechanisms …
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Plant-insect interactions between female dogwood borer and apple
… from a previous, three-year study in two newly planted apple orchards were subjected to geostatistical analyses to examine the temporal and spatial patterns of infestation by larval dogwood borer and to gain further information about the spatial scales at which oviposition occurs. There were …
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Biochemical, Molecular and Functional Analysis of Volatile Terpene Formation in Arabidopsis Roots
Plants produce secondary (or specialized) metabolites to respond to a variety of environmental changes and threats. Especially, volatile compounds released by plants facilitate short and long distance interaction with both beneficial and harmful organisms. Comparatively little is known about the …