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John Vontas - One of the best experts on this subject based on the ideXlab platform.
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identification and Geographical Distribution of pyrethroid resistance mutations in the poultry red mite dermanyssus gallinae
Pest Management Science, 2020Co-Authors: Evangelia Katsavou, Spyros Vlogiannitis, Eleanor Karptatham, Damer P Blake, Aris Ilias, Christina Strube, Ilias Kioulos, Wannes Dermauw, Thomas Van Leeuwen, John VontasAbstract:BACKGROUND The poultry red mite (PRM) Dermanyssus gallinae is the most common ectoparasite on poultry and causes high economic losses in poultry farming worldwide. Pyrethroid acaricides have been widely used for its control and, consequently, pyrethroid resistance has arisen. In this study we aim to investigate the occurrence of resistance and study the Geographical Distribution of pyrethroid resistance mutations across PRM populations in Europe. RESULTS Full dose-response contact bioassays revealed very high levels of resistance against several pyrethroids (α-cypermethrin, fluvalinate, and cyfluthrin) in two PRM populations from Greece, compared to a susceptible reference strain. Resistance was associated with mutations in the gene encoding the target site of pyrethroids, the voltage-gated sodium channel (VGSC). Mutations, M918L and L925V in domain IIS4-S5 and F1534L in domain IIIS6, were found at positions known to play a role in pyrethroid resistance in other arthropod species. Subsequent screening by sequencing VGSC gene fragments IIS4-S5 and IIIS6 revealed the presence and Distribution of these mutations in many European populations. In some populations, we identified additional or different mutations including M918V/T, L925M, T929I, I936F, and F1538L. The latter mutation is a possible alternative for F1538I that has been previously associated with pyrethroid resistance in other Acari species. CONCLUSION We report very high levels of pyrethroid resistance in PRM populations from Greece, as well as the identification and Geographical Distribution of 10 pyrethroid resistance mutations in PRM populations across Europe. Our results draw attention to the need for an evidence-based implementation of PRM control, taking acaricide resistance management into consideration. © 2019 Society of Chemical Industry.
E-hyun Shin - One of the best experts on this subject based on the ideXlab platform.
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RESEARCH ARTICLE Coincidence between Geographical Distribution of Leptotrombidium scutellare and Scrub Typhus Incidence in South Korea
2016Co-Authors: Jong Yul Roh, Wook-gyo Lee, Chan Park, Eun Hee Shin, Won Il Park, Bong Gu Song, Kyu-sik Chang, Hee Il Lee, Mi-yeoun Park, E-hyun ShinAbstract:To clarify the Geographical Distribution of scrub typhus vectors in Korea, a survey of larval trombiculid mites was conducted from 2005 to 2007 by collecting wild small mammals twice a year (spring and autumn) at 24 sites nationwide. A total of 67,325 mites representing 4 genera and 14 species were collected from 783 trapped rodents, corresponding to a chigger index (number of chigger mites per rodent) of 86.0. The predominant mite species were Leptotrombidium pallidum (52.6%), Leptotrombiduim scutellare (27.1%), Leptotrombidium palpale (8.2%), Leptotrombidium orientale (5.6%), and Neotrombicula tamiyai (1.7%). However, the proportions of L. scutellare in southern areas, including endemic provinces such as Jeollabuk-Do (34.3%), Jeollanam-Do (49.0%), and Gyeongsangnam-Do (88%), were relatively higher than in central Korean regions where L. pallidum was predominant. In autumn, the ratio of L. scutellare increased to 42 % while the ratio of L. pallidum decreased. The Geographical Distribution map of the L. scutellare chigger index was identical to the incidence pattern of scrub typhus, whereas thos
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Coincidence between Geographical Distribution of Leptotrombidium scutellare and scrub typhus incidence in South Korea
PloS one, 2014Co-Authors: Jong Yul Roh, Wook-gyo Lee, Chan Park, Eun Hee Shin, Won Il Park, Bong Gu Song, Kyu-sik Chang, Hee Il Lee, Mi-yeoun Park, E-hyun ShinAbstract:To clarify the Geographical Distribution of scrub typhus vectors in Korea, a survey of larval trombiculid mites was conducted from 2005 to 2007 by collecting wild small mammals twice a year (spring and autumn) at 24 sites nationwide. A total of 67,325 mites representing 4 genera and 14 species were collected from 783 trapped rodents, corresponding to a chigger index (number of chigger mites per rodent) of 86.0. The predominant mite species were Leptotrombidium pallidum (52.6%), Leptotrombiduim scutellare (27.1%), Leptotrombidium palpale (8.2%), Leptotrombidium orientale (5.6%), and Neotrombicula tamiyai (1.7%). However, the proportions of L. scutellare in southern areas, including endemic provinces such as Jeollabuk-Do (34.3%), Jeollanam-Do (49.0%), and Gyeongsangnam-Do (88%), were relatively higher than in central Korean regions where L. pallidum was predominant. In autumn, the ratio of L. scutellare increased to 42% while the ratio of L. pallidum decreased. The Geographical Distribution map of the L. scutellare chigger index was identical to the incidence pattern of scrub typhus, whereas those of overall mites and L. pallidum showed no relationship with case incidence patterns. Distribution mapping analysis shows an identical Geographical Distribution of L. scutellare and epidemic incidence of scrub typhus in South Korea. L. pallidum could be another vector at all other parts of the Korean peninsula, including the eastern and northern regions that have a low level of scrub typhus incidence.
Evangelia Katsavou - One of the best experts on this subject based on the ideXlab platform.
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identification and Geographical Distribution of pyrethroid resistance mutations in the poultry red mite dermanyssus gallinae
Pest Management Science, 2020Co-Authors: Evangelia Katsavou, Spyros Vlogiannitis, Eleanor Karptatham, Damer P Blake, Aris Ilias, Christina Strube, Ilias Kioulos, Wannes Dermauw, Thomas Van Leeuwen, John VontasAbstract:BACKGROUND The poultry red mite (PRM) Dermanyssus gallinae is the most common ectoparasite on poultry and causes high economic losses in poultry farming worldwide. Pyrethroid acaricides have been widely used for its control and, consequently, pyrethroid resistance has arisen. In this study we aim to investigate the occurrence of resistance and study the Geographical Distribution of pyrethroid resistance mutations across PRM populations in Europe. RESULTS Full dose-response contact bioassays revealed very high levels of resistance against several pyrethroids (α-cypermethrin, fluvalinate, and cyfluthrin) in two PRM populations from Greece, compared to a susceptible reference strain. Resistance was associated with mutations in the gene encoding the target site of pyrethroids, the voltage-gated sodium channel (VGSC). Mutations, M918L and L925V in domain IIS4-S5 and F1534L in domain IIIS6, were found at positions known to play a role in pyrethroid resistance in other arthropod species. Subsequent screening by sequencing VGSC gene fragments IIS4-S5 and IIIS6 revealed the presence and Distribution of these mutations in many European populations. In some populations, we identified additional or different mutations including M918V/T, L925M, T929I, I936F, and F1538L. The latter mutation is a possible alternative for F1538I that has been previously associated with pyrethroid resistance in other Acari species. CONCLUSION We report very high levels of pyrethroid resistance in PRM populations from Greece, as well as the identification and Geographical Distribution of 10 pyrethroid resistance mutations in PRM populations across Europe. Our results draw attention to the need for an evidence-based implementation of PRM control, taking acaricide resistance management into consideration. © 2019 Society of Chemical Industry.
Jong Yul Roh - One of the best experts on this subject based on the ideXlab platform.
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RESEARCH ARTICLE Coincidence between Geographical Distribution of Leptotrombidium scutellare and Scrub Typhus Incidence in South Korea
2016Co-Authors: Jong Yul Roh, Wook-gyo Lee, Chan Park, Eun Hee Shin, Won Il Park, Bong Gu Song, Kyu-sik Chang, Hee Il Lee, Mi-yeoun Park, E-hyun ShinAbstract:To clarify the Geographical Distribution of scrub typhus vectors in Korea, a survey of larval trombiculid mites was conducted from 2005 to 2007 by collecting wild small mammals twice a year (spring and autumn) at 24 sites nationwide. A total of 67,325 mites representing 4 genera and 14 species were collected from 783 trapped rodents, corresponding to a chigger index (number of chigger mites per rodent) of 86.0. The predominant mite species were Leptotrombidium pallidum (52.6%), Leptotrombiduim scutellare (27.1%), Leptotrombidium palpale (8.2%), Leptotrombidium orientale (5.6%), and Neotrombicula tamiyai (1.7%). However, the proportions of L. scutellare in southern areas, including endemic provinces such as Jeollabuk-Do (34.3%), Jeollanam-Do (49.0%), and Gyeongsangnam-Do (88%), were relatively higher than in central Korean regions where L. pallidum was predominant. In autumn, the ratio of L. scutellare increased to 42 % while the ratio of L. pallidum decreased. The Geographical Distribution map of the L. scutellare chigger index was identical to the incidence pattern of scrub typhus, whereas thos
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Coincidence between Geographical Distribution of Leptotrombidium scutellare and scrub typhus incidence in South Korea
PloS one, 2014Co-Authors: Jong Yul Roh, Wook-gyo Lee, Chan Park, Eun Hee Shin, Won Il Park, Bong Gu Song, Kyu-sik Chang, Hee Il Lee, Mi-yeoun Park, E-hyun ShinAbstract:To clarify the Geographical Distribution of scrub typhus vectors in Korea, a survey of larval trombiculid mites was conducted from 2005 to 2007 by collecting wild small mammals twice a year (spring and autumn) at 24 sites nationwide. A total of 67,325 mites representing 4 genera and 14 species were collected from 783 trapped rodents, corresponding to a chigger index (number of chigger mites per rodent) of 86.0. The predominant mite species were Leptotrombidium pallidum (52.6%), Leptotrombiduim scutellare (27.1%), Leptotrombidium palpale (8.2%), Leptotrombidium orientale (5.6%), and Neotrombicula tamiyai (1.7%). However, the proportions of L. scutellare in southern areas, including endemic provinces such as Jeollabuk-Do (34.3%), Jeollanam-Do (49.0%), and Gyeongsangnam-Do (88%), were relatively higher than in central Korean regions where L. pallidum was predominant. In autumn, the ratio of L. scutellare increased to 42% while the ratio of L. pallidum decreased. The Geographical Distribution map of the L. scutellare chigger index was identical to the incidence pattern of scrub typhus, whereas those of overall mites and L. pallidum showed no relationship with case incidence patterns. Distribution mapping analysis shows an identical Geographical Distribution of L. scutellare and epidemic incidence of scrub typhus in South Korea. L. pallidum could be another vector at all other parts of the Korean peninsula, including the eastern and northern regions that have a low level of scrub typhus incidence.
Ding Yulong - One of the best experts on this subject based on the ideXlab platform.
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Geographical Distribution of phacellaria benth santalaceae and its hosts
Frontiers of Biology in China, 2006Co-Authors: Li Dongxue, Ding YulongAbstract:Based on the Geographical Distribution of the species of Phacellaria and its host plants in the world, we speculated on the possible time, sites, and migration of the origin of Phacellaria. The host plants of Phacellaria mainly belong to Loranthaceae. Plants of Phacellaria and their hosts are mainly distributed in tropical and subtropical areas. The plants of Phacellariamight have originated from a tropical area in the south of China before the Tertiary. Their ancestors were parasitic on the ancestors of some plants of Loranthaceae by chance during the Tertiary. It possibly took them millions of years to form a sturdy relationship with their hosts.
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Geographical Distribution of phacellaria benth santalaceae and its hosts
Guihaia, 2005Co-Authors: Ding YulongAbstract:Based on the Geographical Distribution of the species of Phacellaria and their host plants in the world,the possible time,site and migration of origin of Phacellaria were speculated. The host plants of Phacellaria mainly belong to Loranthaceae. Plants of Phacellaria and their hosts were mainly distributed in tropical and subtropical area. Plants of Phacellaria maybe originated in tropical area in the south of China before Tertiary. Their ancestors were parasitic on ancestors of some plants of Loranthaceae by chance during Tertiary. It took them millions of years to form a sturdy relationship between parasites and hosts.
