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 20 of 52 for “"Insecticide Resistance"”.
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Detection And Characterization of Insecticide Resistance Mechanisms in Culex Tarsalis
<p>Insecticide resistance in disease-transmitting arthropods has become a serious hindrance for successful vector control. Mosquitoes, in particular, are notorious vectors of potentially deadly diseases like malaria, dengue fever, and West Nile virus. Anopheles gambiae and Culex quinquefasciatus …
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Mosquitoes, West Nile Virus, Attractants, Competition, Environmental Conditions, and Insecticide Resistance
… abundance, and 6) measure levels of enzymatic insecticide resistance present in species of female mosquitoes that tested positive for the presence of West Nile Virus. Ofthe two species that were collected, only <em>Culex quinquefasciatus</em> females were found to contain West Nile Virus. Of …
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Factors Affecting the Control of Corn Rootworms With Soil Insecticides: Insecticide Resistance, Distribution, and Persistence
… than in soil from their respective borders. Insecticide persistence and the application method were very important factors affecting insecticide efficacy.
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Morphological and Physiological Characteristics that Contribute to Insecticide Resistance in Bed Bug (Cimex lectularius L.) Eggs
… life stage to control with our currently labeled insecticides, few studies have examined how bed bug egg morphology and physiology is potentially related to pesticide resistance in bed bug eggs. Bed bug egg morphological features were examined using scanning electron microscopy (SEM) and the …
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Reduced cuticular penetration as a contributor to insecticide resistance in the common bed bug, Cimex lectularius L.
… to the sudden resurgence of the bed bugs is insecticide resistance. In this study, we investigated the mechanisms of reduced cuticular penetration type insecticide resistance in bed bugs. First, we determined and compared the lethal dosage (LD50) of a pyrethroid insecticide using topical and …
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STUDIES ON INSECTICIDE RESISTANCE IN TUTA ABSOLUTA (MEYRICK), WITH SPECIAL EMPHASIS ON CHARACTERISATION OF TWO TARGET SITE MECHANISMS
… to both yield and fruit quality. Chemical insecticides have been the main control tools used against T. absoluta, but decreasing efficacy has been attributed to the development of insecticide resistance. During this study, leaf-dip bioassays were used to quantify responses of five field …
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Quantification of insecticide resistance in the tobacco-adapted form of the green peach aphid, Myzus persicae (Sulzer)(Hemiptera: Aphididae)
… in the United States and around the world. Insecticides play a major role in controlling the aphid on tobacco because natural enemies usually fail to maintain its populations below damaging levels. The aphid has a history of developing resistance to many insecticides. Therefore, baseline …
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Investigations of Colorado potato beetle [Leptinotarsa decemlineata (Say)] pest management including: sampling strategies for insecticide resistance detection, development of a knowledge-based expert system and the physiology of cold tolerance
… decemlineata (Say), in a filter-paper insecticide bioassay was determined in three Virginia potato fields in 1989 and five fields in 1990. Bioassays were performed for each of three different insecticides on Colorado potato beetle larvae collected from 12-16 different locations (equal …
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Antibiotic resistant and xenobiotic degrading bacteria that shape the microbiota of the vectors Aedes aegypti & Culicoides sonorensis
… vector control methods involve the use of insecticides such as synthetic pyrethroids like permethrin; however, the development of insecticide resistance has rendered this measure insufficient to control the spread of vectors and their diseases. The new age approach to vector control, …
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Are Post-Transcriptional RNA Modification Events in the Glutamate-Gated and GABA-Gated Chloride Channels of Anopheles minimus and Anopheles dirus associated with Ivermectin Insensitivity?
… every year. Vector control strategies such as insecticide use were initially effective in reducing malaria transmission. However, the emergence and ever-increasing presence of insecticide resistance has drastically hindered malaria control efforts. Insecticide resistance develops through …
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Biology and integrated pest management of the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), in Southeastern cotton
… cotton area sprayed with broad-spectrum insecticides for L. lineolaris has increased in these states. As such, this dissertation research sought to answer a variety of questions to address this issue including 1) mapping the spatiotemporal abundance of L. lineolaris across Virginia as …
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The cabbage whitefly, aleyrodes Proletella: causes of outbreaks and potential solutions
… the year. In order to test the contribution of insecticide resistance to these outbreaks, a leaf-dip bioassay method was developed. Resistance to several pyrethroids was found in multiple populations in Lincolnshire and Kent, with similar patterns between compounds but differing magnitudes of …
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Regulatory mechanisms involved in the control of <i>CYP6M2</i> gene in insecticide resistant <i>Anopheles gambiae</i> (Diptera: culicidae)
… variable expression of <i>CYP6M2</i> in all the insecticide selected individuals, which may potentially be associated with insecticide resistance. This study provides useful information on our understanding of the regulatory mechanisms involved in insecticide resistance. These results have …
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Molecular Definition of Cytochrome P450 -Mediated Multiple Resistance in Helicoverpa Zea
… as a pre-adaptation for the acquisition of insecticide resistance. To evaluate this hypothesis, I conducted a series of experiments with Helicoverpa zea, a polyphagous noctuid of economic importance. Studies at the population level demonstrated that exposure to xanthotoxin, a linear …
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Invasion genomics, adaptive evolution, and transcriptional plasticity of Anopheles stephensi in Ethiopia and Yemen : implications for malaria transmission and control.
… loci under positive selection associated with insecticide resistance and urban adaptation. Complementary larval RNA sequencing from Ethiopian populations demonstrates that local environmental conditions drive differential expression of genes involved in detoxification, immunity, metabolism, and …
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Optimal Management of a Common Property Pest Under Risk: An Application to the Corn Rootworm
… threshold model. Two control actions, soil insecticide and crop rotation, are included. The effect of crop insurance and improved scouting accuracy on insecticide use is evaluated. The rootworm population is considered to be a common property resource with an exhaustible stock of …
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Factors Influencing Sugar Feeding in Invasive Mosquitoes
… and because challenges, such as the rise of insecticide resistance, arise, there is an urgent need for developing effective and ecologically friendly disease vector control strategies. It is therefore important to deepen our understanding of mosquito phytophagy and, consequently, its …
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Exploring Mosquito Thermal Biology and Chemical Ecology in the Context of Host-Seeking and Climate Change
… these methods may be challenged due to a rise in insecticide resistance in some mosquito species, the increasing impacts of global climate change, and invasive species populations. This work presents four distinct projects investigating Culex spp., Ae. albopictus, and Ae. j. japonicus mosquitoes …
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The Plant Diet of Mosquitoes: Sugar Feeding on Ornamentals and Wildflowers
… by current control methods, such as increased insecticide resistance and environmental damage, novel control strategies have emerged that exploit the mosquito's biological need to feed on sugar. However, an improved understanding of sugar feeding behavior is needed to better optimize these …
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Investigating the role of glutathione and glutathione biosynthetic genes in the adaption of Anopheles gambiae to insecticides
… where vector control measures involve the use of insecticides in the forms of long-lasting insecticide-treated nets (LLINs) and indoor residual spraying (IRS). The development of insecticides resistance mitigates these approaches. Glutathione (GSH) is widely distributed among all living organisms, …
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