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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 33 for “"Biocontrol agent"”.
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Constraints on Neltumius arizonensis (Coleoptera: Bruchidae) as a biocontrol agent of prosopis in South Africa : the role of parasitoids
… populations and hence its effectiveness as a biocontrol agent is negligible.
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Using Modelling to Optimise the Use of Biological Control Agents Against Soil-Borne Plant Pathogens
… interest in the use of biological control agents as a control strategy against plant pathogens. However, significant variability in their success at pathogen suppression across field trials has resulted in them often not being seen as commercially viable. This thesis uses mathematical …
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Aspects of the biology of the receptacle weevil, Rhinocyllus conicus (Froehlich) relating to its role as a biocontrol agent of nodding thistle, Carduus nutans L.
Observations were carried out on the lifecycle of Rhinocyllus conicus (receptacle weevil) and growth forms of Carduus nutans (nodding thistle) from Nov. 1988 to June 1990 at Galatea in the central Bay of Plenty and on the coast at Whakatane. The dates of first emergence of adults in the spring, …
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Investigation into the effects of parasitoids on a gall midge Dasineura sp. (Cecidomyiidae), a biological control agent of Australian myrtle, Leptospermum laevigatum
… invading species in the fynbos biome and its biocontrol is of high conservation priority in the Western Cape. The first species used as a biocontrol agent was a leaf-mining moth Parectopa thalassias that became established and wide-spread. The second agent a Dasineura sp (Cecidomyiidae) gall …
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Prediction of safety and effectiveness of a candidate biocontrol agent : quarantine evaluation of the root-feeding, Mexican flea beetle, Longitarsus bethae, for potential release against the noxious weed, Lantana camara, in Africa
… in quarantine as a candidate biological control agent for the noxious weed, Lantana camara L. (Verbenaceae). The premise was that L. bethae would only be released if it could be ascertained that it was: (i) safe for non-target plants; (ii) likely to inflict significant damage on the target weed; …
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Biological control of wood decay in ground contact timbers
… have been extensively investigated as potential biocontrol agents in agriculture and forestry. <br/><br/>A small-scale wood-based screening system was developed for the rapid assessment of biocontrol potential. The screening system used non-sterile soil as a test medium to provide a natural …
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Exploring Interactions of Phyllosphere Epiphytes with Plant Pathogenic Bacteria Pseudomonas and Xanthomonas on Tomato
… secretion system in infection with a potential biocontrol agent. To explain interactions among the <em>phyllosphere</em> residents, nutritional similarity, motility and direct inhibition were observed <em>in vitro</em>. Based off the literature, it was hypothesized that<em> Sphingomonas</em> …
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Patterns of parasitism and emergence in the gall midge Dasineura Dielsii (Diptera: Cecidomyiidae) : a biological control agent of Acacia cyclops in South Africa
… in South Africa and this has limited biocontrol agents to those that reduce only reproductive capacity. Dasineura dielsii was released in 2002 as a biocontrol agent for A. cyclops. This gall-forming midge destroys inflorescences and prevents seedpods from forming, but allows continued …
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Novel antagonistic bacteria as prospective agents for the biocontrol of some plant bacterial diseases
… been continued to improve biological control agents as commercial products for use in disease control (Baker and Cook (1974), Cook and Baker (1983), Cook (1993). The effectivity of biological control agents on numerous plant-pathogen combinations was demonstrated by several authors (Tzeng et …
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Identification and characterization of genes in antagonism against soybean fungal pathogens by lysobacter enzymogenes
… enzymogenes strain C3 (LeC3) is a potential biocontrol agent for various fungal, oomycete, bacterial, and nematode plant diseases. Understanding the molecular mechanism of LeC3 antagonism against multiple pathogens could greatly improve its biocontrol efficacy. In this study, a library …
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Influence of feeding-location on nutritional quality for cochineal insects (Homoptera : Dactylopiidae) on Opuntia ficus-indica (Cactaceae)
… opuntiae has been an extremely successful biocontrol agent of the cactus weed Opuntia ficus-indica. Its resounding success has allowed us to take a closer look at how the relationships between biocontrol agents and their host plants are maintained. The prickly pear, O. ficus-indica, is the …
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Elucidating the Molecular Pathways Involved in the Fitness and Water Stress Response of Pseudomonas synxantha 2-79 in the Plant Rhizosphere
<p><em>Pseudomonas synxantha</em> 2-79 is a biocontrol agent that represents beneficial indigenous rhizobacteria that are broadly distributed in the Pacific Northwest, USA and flourish in the rhizosphere of commercially grown wheat under surprisingly arid conditions. The molecular adaptation of …
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Neltumius arizonensis (Schaeffer) (Coleoptera: Bruchidae) as a biological control agent of mesquite (Prosopis spp., Mimosaceae) in South Africa
… Wooton. Algarobius prosopis (Leconte), the first biocontrol agent released, destroys large numbers of mesquite seeds annually, where livestock do not graze pods that are lying on the ground. Where pods are grazed, however, there is insufficient time for A. prosopis to inflict an adequate degree of …
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Use of the egg parasitoid, Trichogramma ostriniae (Hymenoptera: Trichogrammatidae) as a biological control agent of the European corn borer, Ostrinia nubilalis (Lepidoptera: Crambidae): An approach to integrated pest management in bell pepper
… demonstrate that T. ostriniae has potential as a biocontrol agent for O. nubilalis in solanaceous crops.
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Genetic Analysis of Tritrophic Interactions between Entompathogenic Nematodes, Symbiotic Bacteria and Blood – Sucking Flies.
… EPNs from the U.K. could be used as an effective biocontrol agent for mosquito and chironomid species. This study includes a snapshot of the current EPN diversity in the U.K. which found four different Steinernema species, including the first molecular confirmation of Steinernema carpocapsae. EPNs …
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The analysis of Metarhizium robertsii potential as endophytic plant root coloniser, plant growth enhancer and antagonist to bean root pathogen Fusarium solani f. sp. phaseolis.
… results in the proliferation of root hairs. The biocontrol of bean (Phaseolis vulgaris) root rot fungus Fusarium solani f. sp. phaseolis by Metarhizium robertsii was investigated in vitro and in vivo. Dual cultures on Petri dishes showed antagonism of M robertsii against F. solani. A relative …
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Biological and ecological studies of Hydrotaea aenescens (Wiedemann) (Diptera: Muscidae), and other arthropods of high-rise cage layer poultry houses
… conditions, and to promote its use as a biocontrol agent for controlling house flies in poultry houses. Taxonomic diversity of arthropods in a new high-rise cage layer poultry house was determined from manure samples collected from different manure moisture categories. Stabilization of …
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Molecular characterization of tomato brown rugose fruit virus-host interactions and development of biocontrol strategies
… develop a disease management approach through biocontrol. In this dissertation, the genomes of three ToBRFV Canadian isolates were cloned and sequenced, and full-length cDNA infectious clones were constructed. Defective mutation analyses revealed that ToBRFV movement protein (MP) and coat …
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