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I Denholm - One of the best experts on this subject based on the ideXlab platform.
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correlated responses to neonicotinoid insecticides in clones of the peach potato aphid Myzus Persicae hemiptera aphididae
Pest Management Science, 2008Co-Authors: S P Foster, Diana Cox, L Oliphant, Samantha Mitchinson, I DenholmAbstract:BACKGROUND: Although there are still no confirmed reports of strong resistance to neonicotinoid insecticides in aphids, the peach-potato aphid (Myzus Persicae Sulzer) shows variation in response, with some clones exhibiting up to tenfold resistance to imidacloprid. Five clones varying in response to imidacloprid were tested with four other neonicotinoid molecules to investigate the extent of cross-resistance. RESULTS: All four compounds - thiamethoxam, thiacloprid, clothianidin and dinotefuran - were cross-resisted, with ED 50 values ranked in the same order as for imidacloprid. Resistance factors ranged up to 11 for imidacloprid, 18 for thiamethoxam, 13 for thiacloprid, 100 for clothianidin and 6 for dinotefuran. CONCLUSION: This variation in response does not appear to be sufficient to compromise the field performance of neonicotinoids aimed at controlling aphids. However, it highlights the need for careful vigilance and stewardship in all M. Persicae populations, and a need to consider neonicotinoids as a single cross-resisted group for management purposes.
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variation in response to neonicotinoid insecticides in peach potato aphids Myzus Persicae hemiptera aphididae
Pest Management Science, 2003Co-Authors: S P Foster, I Denholm, R ThompsonAbstract:Laboratory bioassays applying the neonicotinoid insecticides imidacloprid, acetamiprid and nitenpyram against clones of the peach-potato aphid Myzus Persicae (Sulzer) demonstrated that these compounds effectively circumvent the known carboxylesterase, modified acetylcholinesterase (MACE) and knock-down (kdr) insecticide resistance mechanisms in this species. However, some clones showed cross-tolerance (up to 18-fold) of these compounds relative to susceptible standards. A survey assessing the frequency of neonicotinoid tolerance in M Persicae in the UK, based on samples collected from the field and glasshouses between 1997 and 2000, showed that such tolerance is still rare. Experiments on neonicotinoid-susceptible and -tolerant populations of M Persicae under simulated field conditions in the laboratory showed that, although the latter were well controlled by imidacloprid applied at recommended application rates, they were more likely to survive and reproduce when this compound was applied at lower concentrations. Such conditions are probably periodically present in imidacloprid-treated field and glasshouse crops. Selection favouring tolerant forms of M Persicae could lead to increases in their frequency and the evolution of more potent resistance to neonicotinoids.
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the evolution of insecticide resistance in the peach potato aphid Myzus Persicae
Insect Biochemistry and Molecular Biology, 1998Co-Authors: Chris Bass, Linda M. Field, S P Foster, I Denholm, Alin M Puinean, Christoph T Zimmer, Oliver Gutbrod, Ralf Nauen, Russell Slater, Martin S WilliamsonAbstract:The peach potato aphid, Myzus Persicae is a globally distributed crop pest with a host range of over 400 species including many economically important crop plants. The intensive use of insecticides to control this species over many years has led to populations that are now resistant to several classes of insecticide. Work spanning over 40 years has shown that M. Persicae has a remarkable ability to evolve mechanisms that avoid or overcome the toxic effect of insecticides with at least seven independent mechanisms of resistance described in this species to date. The array of novel resistance mechanisms, including several ‘first examples’, that have evolved in this species represents an important case study for the evolution of insecticide resistance and also rapid adaptive change in insects more generally. In this review we summarise the biochemical and molecular mechanisms underlying resistance in M. Persicae and the insights study of this topic has provided on how resistance evolves, the selectivity of insecticides, and the link between resistance and host plant adaptation.
S P Foster - One of the best experts on this subject based on the ideXlab platform.
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micro evolutionary change in relation to insecticide resistance in the peach potato aphid Myzus Persicae
Ecological Entomology, 2010Co-Authors: B Fenton, John T Margaritopoulos, G Malloch, S P FosterAbstract:1. Phenotypic diversity is the fuel that powers evolution. 2. Asexual organisms rely on mutation whereas sexual organisms combine mutation with recombination. 3. Few organisms provide examples of species that are both sexual and asexual, but aphids do. 4. To examine evolution on perceptible timescales requires strong evolutionary forces and, as Darwin noted, agricultural practices provide strong selection. In the case of aphids, insecticides provide a considerable force in the elimination of genotypes. 5. Insecticide resistance in Myzus Persicae (Sulzer) has arisen independently through point mutation and gene amplification on a number of occasions and at different times. Resistance to organophosphates, pyrethroids, and pirimicarb (a dimethyl carbamate) is now widespread. 6. In this paper, we examine these three elements: sexual recombination, clonal expansion, and insecticide selection in the peach–potato aphid M. Persicae in relation to the evolution of insecticide resistance and survival of the fittest clone.
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correlated responses to neonicotinoid insecticides in clones of the peach potato aphid Myzus Persicae hemiptera aphididae
Pest Management Science, 2008Co-Authors: S P Foster, Diana Cox, L Oliphant, Samantha Mitchinson, I DenholmAbstract:BACKGROUND: Although there are still no confirmed reports of strong resistance to neonicotinoid insecticides in aphids, the peach-potato aphid (Myzus Persicae Sulzer) shows variation in response, with some clones exhibiting up to tenfold resistance to imidacloprid. Five clones varying in response to imidacloprid were tested with four other neonicotinoid molecules to investigate the extent of cross-resistance. RESULTS: All four compounds - thiamethoxam, thiacloprid, clothianidin and dinotefuran - were cross-resisted, with ED 50 values ranked in the same order as for imidacloprid. Resistance factors ranged up to 11 for imidacloprid, 18 for thiamethoxam, 13 for thiacloprid, 100 for clothianidin and 6 for dinotefuran. CONCLUSION: This variation in response does not appear to be sufficient to compromise the field performance of neonicotinoids aimed at controlling aphids. However, it highlights the need for careful vigilance and stewardship in all M. Persicae populations, and a need to consider neonicotinoids as a single cross-resisted group for management purposes.
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variation in response to neonicotinoid insecticides in peach potato aphids Myzus Persicae hemiptera aphididae
Pest Management Science, 2003Co-Authors: S P Foster, I Denholm, R ThompsonAbstract:Laboratory bioassays applying the neonicotinoid insecticides imidacloprid, acetamiprid and nitenpyram against clones of the peach-potato aphid Myzus Persicae (Sulzer) demonstrated that these compounds effectively circumvent the known carboxylesterase, modified acetylcholinesterase (MACE) and knock-down (kdr) insecticide resistance mechanisms in this species. However, some clones showed cross-tolerance (up to 18-fold) of these compounds relative to susceptible standards. A survey assessing the frequency of neonicotinoid tolerance in M Persicae in the UK, based on samples collected from the field and glasshouses between 1997 and 2000, showed that such tolerance is still rare. Experiments on neonicotinoid-susceptible and -tolerant populations of M Persicae under simulated field conditions in the laboratory showed that, although the latter were well controlled by imidacloprid applied at recommended application rates, they were more likely to survive and reproduce when this compound was applied at lower concentrations. Such conditions are probably periodically present in imidacloprid-treated field and glasshouse crops. Selection favouring tolerant forms of M Persicae could lead to increases in their frequency and the evolution of more potent resistance to neonicotinoids.
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the evolution of insecticide resistance in the peach potato aphid Myzus Persicae
Insect Biochemistry and Molecular Biology, 1998Co-Authors: Chris Bass, Linda M. Field, S P Foster, I Denholm, Alin M Puinean, Christoph T Zimmer, Oliver Gutbrod, Ralf Nauen, Russell Slater, Martin S WilliamsonAbstract:The peach potato aphid, Myzus Persicae is a globally distributed crop pest with a host range of over 400 species including many economically important crop plants. The intensive use of insecticides to control this species over many years has led to populations that are now resistant to several classes of insecticide. Work spanning over 40 years has shown that M. Persicae has a remarkable ability to evolve mechanisms that avoid or overcome the toxic effect of insecticides with at least seven independent mechanisms of resistance described in this species to date. The array of novel resistance mechanisms, including several ‘first examples’, that have evolved in this species represents an important case study for the evolution of insecticide resistance and also rapid adaptive change in insects more generally. In this review we summarise the biochemical and molecular mechanisms underlying resistance in M. Persicae and the insights study of this topic has provided on how resistance evolves, the selectivity of insecticides, and the link between resistance and host plant adaptation.
Helmut Saucke - One of the best experts on this subject based on the ideXlab platform.
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evidence for trichromacy in the green peach aphid Myzus Persicae sulz hemiptera aphididae
Journal of Insect Physiology, 2005Co-Authors: Sascha Kirchner, Thomas F Doring, Helmut SauckeAbstract:Abstract The green peach aphid, Myzus Persicae (Hemiptera: Aphididae) is an important phytophagous pest of greenhouse and field crops. In the host finding process visual cues are of paramount importance. In order to contribute to the understanding of the perception of visual stimuli in this species, we measured the electroretinogram of alate female summer migrants of M. Persicae. The spectral sensitivity was measured in 10 nm steps under both dark and light adaptation from 320 to 640 nm. The dark adapted spectral sensitivity curve showed one maximum in the green region around 530 nm and a distinct shoulder between 500 and 510 nm. In presence of adapting light, a secondary blue–green peak (490 nm) and a third peak in the near UV (330–340 nm) were observed. From these results we conclude that M. Persicae has three spectral types of photoreceptors.
Jiménez Vela, Enma Emperatriz - One of the best experts on this subject based on the ideXlab platform.
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Influencia de la Hippodamia convergens en el control biológico de Myzus Persicae presente en el Solanum lycopersicum a condiciones de invernadero
'Universidad Cesar Vallejo', 2019Co-Authors: Chinchayhuara Capa, Rosario Kelly, Jiménez Vela, Enma EmperatrizAbstract:El control biológico busca contribuir con una alternativa de solución ante la infestación de plagas en los cultivos, reducir los efectos negativos que en gran mayoría disminuye la producción y la aplicación excesiva de plaguicidas, siendo los químicos los que contaminan el suelo, agua y aire. El objetivo principal de la investigación fue determinar la influencia de la Hippodamia convergens “mariquita” en el control biológico de Myzus Persicae “pulgón” presente en el Solanum lycopersicum “tomate “a condiciones de invernadero, como enemigo natural se utilizó a los cuatro estadíos larvales (I,II,III,VI) de la Hippodamia convergens “mariquita” durante 31 días, se hizo el conteo del número de Myzus Persicae “pulgón” depredados, utilizando el método de la aguja, las larvas fueron criadas desde la reproducción, mientras que los Myzus Persicae “pulgón” fueron recolectado de un huerto de Solanum lycopersicum “tomate” ubicados en distrito El Porvenir –Trujillo. El diseño fue experimental factorial con medidas repetidas, un grupo control, de tipo aplicada – cuantitativa. Los grupos experimentales fueron cuatro tratamientos con grupo control T0:0/1500; T1:3/1500; T2:4/1500; T3:9/1500 (estadíos de Hippodamia converges “mariquita” versus el Myzus Persicae “pulgón” ).Según la prueba estadística de comparaciones múltiples de Duncan fue T3:9/1500 el más eficiente a su vez con un promedio de 1476 Myzus Persicae “pulgón” depredados, con un porcentaje de control del 98,31 % seguido del T2 :6/1500 con un promedio de 962 Myzus Persicae “pulgón” depredados con porcentaje de control de 64.17 % .También el porcentaje de control por estadío fue el IV con 51.47 % en el T3.Finalmente los aspectos etológicos de las larvas por estadío tienen diferente longitud de crecimiento con 2 mm hasta 8 mm ,siendo el III y IV estadío más depredadores contra la plaga que ataca a la planta de solanum lycopersicum “tomate”
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Influencia de la Hippodamia convergens en el control biológico de Myzus Persicae presente en el Solanum lycopersicum a condiciones de invernadero
'Universidad Cesar Vallejo', 2019Co-Authors: Chinchayhuara Capa, Rosario Kelly, Jiménez Vela, Enma EmperatrizAbstract:TesisTrujilloEscuela Académico Profesional de Ingeniería AmbientalCalidad y Gestión de Recursos NaturalesEl control biológico busca contribuir con una alternativa de solución ante la infestación de plagas en los cultivos, reducir los efectos negativos que en gran mayoría disminuye la producción y la aplicación excesiva de plaguicidas, siendo los químicos los que contaminan el suelo, agua y aire. El objetivo principal de la investigación fue determinar la influencia de la Hippodamia convergens “mariquita” en el control biológico de Myzus Persicae “pulgón” presente en el Solanum lycopersicum “tomate “a condiciones de invernadero, como enemigo natural se utilizó a los cuatro estadíos larvales (I,II,III,VI) de la Hippodamia convergens “mariquita” durante 31 días, se hizo el conteo del número de Myzus Persicae “pulgón” depredados, utilizando el método de la aguja, las larvas fueron criadas desde la reproducción, mientras que los Myzus Persicae “pulgón” fueron recolectado de un huerto de Solanum lycopersicum “tomate” ubicados en distrito El Porvenir –Trujillo. El diseño fue experimental factorial con medidas repetidas, un grupo control, de tipo aplicada – cuantitativa. Los grupos experimentales fueron cuatro tratamientos con grupo control T0:0/1500; T1:3/1500; T2:4/1500; T3:9/1500 (estadíos de Hippodamia converges “mariquita” versus el Myzus Persicae “pulgón” ).Según la prueba estadística de comparaciones múltiples de Duncan fue T3:9/1500 el más eficiente a su vez con un promedio de 1476 Myzus Persicae “pulgón” depredados, con un porcentaje de control del 98,31 % seguido del T2 :6/1500 con un promedio de 962 Myzus Persicae “pulgón” depredados con porcentaje de control de 64.17 % .También el porcentaje de control por estadío fue el IV con 51.47 % en el T3.Finalmente los aspectos etológicos de las larvas por estadío tienen diferente longitud de crecimiento con 2 mm hasta 8 mm ,siendo el III y IV estadío más depredadores contra la plaga que ataca a la planta de solanum lycopersicum “tomate”
R Thompson - One of the best experts on this subject based on the ideXlab platform.
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variation in response to neonicotinoid insecticides in peach potato aphids Myzus Persicae hemiptera aphididae
Pest Management Science, 2003Co-Authors: S P Foster, I Denholm, R ThompsonAbstract:Laboratory bioassays applying the neonicotinoid insecticides imidacloprid, acetamiprid and nitenpyram against clones of the peach-potato aphid Myzus Persicae (Sulzer) demonstrated that these compounds effectively circumvent the known carboxylesterase, modified acetylcholinesterase (MACE) and knock-down (kdr) insecticide resistance mechanisms in this species. However, some clones showed cross-tolerance (up to 18-fold) of these compounds relative to susceptible standards. A survey assessing the frequency of neonicotinoid tolerance in M Persicae in the UK, based on samples collected from the field and glasshouses between 1997 and 2000, showed that such tolerance is still rare. Experiments on neonicotinoid-susceptible and -tolerant populations of M Persicae under simulated field conditions in the laboratory showed that, although the latter were well controlled by imidacloprid applied at recommended application rates, they were more likely to survive and reproduce when this compound was applied at lower concentrations. Such conditions are probably periodically present in imidacloprid-treated field and glasshouse crops. Selection favouring tolerant forms of M Persicae could lead to increases in their frequency and the evolution of more potent resistance to neonicotinoids.
