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 15 of 15 for “"acaricides"”.
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Toxicological Analysis of Acaricides for Varroa Mite Management
… nervous system is a target site for existing acaricides. These acaricides not only have adverse health effects on bees, but resistance limits their use to reduce mites and diseases in bee colonies. Voltage-gated chloride channels are involved in the maintenance of nerve and muscle excitability …
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Toxicity of selected acaricides on Tetranychus urticae Koch (Tetranychidae: Acari) and Orius insidiosus Say (Hemiptera: Anthocoridae) life stages and predation studies with Orius insidiosus
… Tetranychus urticae (TSSM) rely upon applying acaricides. Multiple applications are required, which impact natural enemies. Growers will benefit from a more complete understanding of acaricide toxicity. My objectives were to determine: 1.) stage-specific direct and residual efficacy of three …
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Using selected acaricides to manipulate Tetranychus urticae Koch populations in order to enhance biological control provided by phytoseiid mites
… of this study were to; 1. Measure the effects of acaricides on the density and age structure of T. urticae populations. 2. Determine the compatibility of acaricides in an IPM program by measuring the toxicity of residues to P. persimilis and T. urticae adults. 3. Study the feeding behavior of P. …
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Adrenal steroid, blocking agent, and social stress effects on northern fowl mite population development on Leghorn chickens and toxicological evaluation of selected acaricides (Acarina: <i>macronyssidae</i>)
Administration of adrenal steroids or blocking agents at optimum doses influenced northern fowl mite development on chickens. Corticosterone at 20 ppm or desoxycorticosterone at 30 ppm in feed were most effective in inhibiting mite infestations. High levels of social stress increased resistance of …
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Methods for controlling two European Honey bee (Apis mellifera L.) pests: Varroa mites (Varroa destructor, Anderson and Trueman) And Small hive beetles (Aethina tumida)
… V. destructor resistance to three common acaricides (amitraz, coumaphos, and tau-fluvalinate) throughout the three geographic regions of Virginia using glass vial contact bioassays; the results showed no resistance in the sites tested. To gain better insights into A. tumida pharmacology, …
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The role of ATP-sensitive inwardly rectifying potassium channels in the honey bee (Apis mellifera L.)
… stressors such as commonly used in-hive acaricides can impact bee cardiac physiology and tolerance to viral infection. These results suggest that KATP channels provide a significant link between cellular metabolism and the antiviral immune response in bees and highlight the significant …
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The Effects of Pesticide Exposures on the Nutritional and Immune Health of the Honey Bee, Apis mellifera L.
… Excessive use of agrochemicals such as the acaricides coumaphos and tau-fluvalinate, and the fungicide, chlorothalonil is implicated in the reduced number of managed bee colonies available for crop pollination services. Here, I report the effects of pesticide exposures on the nutritional and …
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The structure and function of Gene's organ and its associated glands in ticks
… similar manner to sublethal doses of formamidine acaricides. Tick muscle has received few previous investigations, so the present study also concerns the ultrastructure and electrophysiology of the retractor muscles controlling the horns and their innervation. Evidence is presented implicating …
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STUDIES ON INSECTICIDE RESISTANCE IN TUTA ABSOLUTA (MEYRICK), WITH SPECIAL EMPHASIS ON CHARACTERISATION OF TWO TARGET SITE MECHANISMS
… are a major class of neurotoxic insecticides and acaricides used extensively over the last decades. One important mechanism of resistance to pyrethroids, termed knockdown resistance (kdr), has been shown to arise through alterations (point mutations) in the para-type sodium channel protein leading …
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<i>Neoseiulus fallacis</i> (Garman) (Acari: Phytoseiidae) as a potential biological control agent for spider mites (Acari: Tetranychidae) in Virginia vineyards
… the industry in Virginia. Only three effective acaricides are registered on grapes and as resistance begins to occur, control options are limited. Biological control of spider mites by inoculative or inundative releases of predatory mites has been tried on a wide range of crops including grapes. …
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Contribución al manejo integrado de ácaros tetraníquidos (Acari: Tetranychidae) que afectan a frutales de clima templado
… with the development of resistances against many acaricides, is the reason why the spider mites are currently one of the most important phytosanitary problems. Taking into account the importance to implement Integrated Pest Management (IPM) programs, developing researches to optimize its …
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The Effect of Plant Nutrition on the Reproductive Rate and Susceptibility to Malathion of Two Strains of the Two-Spotted Spider Mite, Tetranychus telarius (L.)
… different levels of susceptibility to phosphate acaricides. Lima bean plants were grown in quartz sand and supplied nutrient solutions containing varying levels of nitrogen, phosphorus and potassium. Total nitrogen and total water soluble carbohydrate in the host plant tissue were determined by …
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Spatial Ecology and Remote Sensing in the Precision Management of Tetranychus urticae (Acari: Tetranychidae)in Peanut
… Because TSSM has developed resistance to many acaricides and there are restrictions on the use of pesticides, an alternative approach, such as precision pest management, is needed that would reduce the amount of pesticides that must be applied. This study was initiated to determine whether …
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Changes in Gene Expression and Viral Titer in Varroa Jacobsoni Mites After a Host Shift Asian to European Honey Bees
… and mite resistance to active ingredients of acaricides has become common. <em>V. destructor</em> causes direct impacts on bee production as well as indirect effects on bee health by vectoring viruses and other pathogens. These large ectoparasitic mites are associated with a condition known as …