• Korean Journal of Environment and Ecology
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• v.23 no.5
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• pp.411-417
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• 2009

This research is intended to discover physiological and biochemical defense mechanisms against herbivores of 8 species of the genus Acerby examining the morphological characteristics of the leaf, the structure and number of leaf domatia, herbivores insects and mites feeding on leaves, which were collected from the trees growing in Mt. Chiak, Mt. Cheongtae, Mt. Jungwang, Mt. Bangtae, Mt. Taebaek and Wonju City. This research was conducted from May through July, 2009, and the results are as follows. The domatia of A. pseudosieboldianum, A. pictum subsp. mono and A. mandshuricum belongs to tuft type; that of A. palmatum, A. triflorum and A. tschonoskii pocket+tuft type; and that of A. tegmentosum pocket type. The number of domatia per leaf turned out to be the highest in the case of A. tegmentosum(20.2), and the lowest in the case of A. ginnala (4.2). Leaf surface trichomes of A. palmatum, A. pseudosiebotdianum, A. ginnala and A. mandshuricum are covered with villi; those of A. pictum subsp. mono and A. triflorum with soft, pilose type of hair, and those of A. tschonoskii with stiff, strigose hair. The trichome density of lower leaf surface is found to be higher than that of the upper leaf surface. Only in the case of A. palmatum, A. pseudosieboldianum, A. tegmentosum and A. tschonoskii, a small amount of nectar is found to be secreted from the distal vein parts of the leaf margin. The number of mites on each leaf are found to be significantly different among tree species, and average mites number per leaf was the highest in the case of A. tschonoskii (9.2/leaf), and A. mandshuricum, A. pseudosieboldianum, and A. triflorum follow it in decreasing order. Minute insects attacking the leaf of Acer spp. include Periphyllus californiensis, P. viridis, Psylla spp, and gall mites, and the number of these insects are found in Periphyllus californiensis, Psylla spp, P. viridis, and Cicadellidae sp. in decreasing order. The natural enemies of these herbivores insects are predatory mites, such as Chilocorus rubidus, Coccinella septempunctata and the nymph, Aphidius ervi, Poecilocoris lewisi and its larva, and Poecilocoris lewisi. Lasius japonicus and Formica japonica are symbiotic with aphids, and supports herbivores. Finally, our research confirmed that predatory mites attack Periphyllus californiensis and suck the body fluid of their victim. This proves that mites form a symbiotic relationship with plants through the mediation of leaf domatia. This also indicates that a protective mutualism may be more conspicuous in temperate broad-leaved trees.

• Korean Journal of Poultry Science
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• v.47 no.4
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• pp.211-217
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• 2020

This study evaluated calcium hydroxide (slaked lime) and a combination of plant extracts ('natural product'; clove, cinnamon, and saponin; 1:1:1 ratio) as acaricidal control mechanisms for poultry red mites. Red mite susceptibility was evaluated after treatments with 10% slaked lime, 20% slaked lime, and 1% natural product. The duration of the acaricidal effect was also tested at 0, 10, 30, and 60 min after treatment using 20% slaked lime, 1% natural product, or a mixture of both. In the in vitro experiment, the slaked lime treatments were 73.2% (10% slaked lime) and 85.1% (20% slaked lime) effective on red mites. In acaricidal effect of control materials over times, with 20% slaked lime, the acaricidal effect decreased to 50.7% after 30 min, and 12.7% after 60 min (P<0.05). With 1% natural product, there was no acaricidal effect after 30 min (P<0.05). With 20% slaked lime +1% natural product, all of poultry red mites died until 30 min, and 92.9% after 60 min (P<0.05). On the farm, poultry red mites were observed that the number of poultry red mites increased 7,923 from 36 to 45 weeks, but then decreased to 483 after 20% slaked lime plus 1% natural product treatment. These results indicate that combining slaked lime and plant extracts effectively control poultry red mites.

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2002.05a
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• pp.33-33
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• 2002

• Animal cells and systems
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• v.5 no.1
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• pp.17-23
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• 2001

Two new species of oribatid mites, Dicastribates tenuisetosus sp. nov, and Liacarus unjangensis sp. nov. are described from Korea. Dicastribates tenuisetosus sp. nov. is easily distinguishable from a single known species, D. heterotrichus (Mahunka, 1984) from Paraguay by the presence of 14 pairs of distallv attenuate notogastral setae, the smooth rostral and lamellar setae, the relatively short and distally attenuating interlamellar setae, the relatively short sensilli with distinctly clavated head, and presence of two and six setae on epimeral region III and genital plate. Liacarus unjangensis sp. nov. can be easily distinguished from most other known species by the very wide lamellae which cover dorsally whole prodorsum, the presence of equal sized inner and outer teeth of lamellar cusps and the minute rostral, lamellar and interlamellar setae.

• Korean journal of applied entomology
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• v.35 no.4
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• pp.280-286
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• 1996

The present work describes four new species of oribatid mites, which were collected from Sangumburi in Chejudo, Korea. They were Brasilobates sangumburiensis sp. nov., Xenillus multisetosus sp. nov., Nippobodes tamlaensis sp. nov., and Nippobodes chejuensis sp. nov.

• Korean Journal of Environmental Biology
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• v.33 no.2
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• pp.209-214
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• 2015

The Mesostigmata is an order of Subclass Acari either parasiting to diverse invertebrates or free-living predatory in terrestrial ecosystem. Phoresy is one of the unique behaviors of wingless arthropod dispersal by attaching winged arthropods. We collected mites attached on the dorsal part of abdomen adult sciarid fly, from mushroom culture. The mites were identified as Arctoseius cetratus Sellnick, 1940 in the family of Ascidae. Arctoseius cetratus has short J2, Z1, Z2, and S1, S2 setae, not reaching the bases of following setae. Posterior half of dorsal shield with longitudinal garland of puncta between J and Z setae, peritremes extending anteriorly to midlevel of coxaII. The genus Arctoseius and species Arctoseius cetratus are the first record in Korea. We provided the detail description of the species including the identification key in the family with some ecological notes.

• The Korean Journal of Ecology
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• v.12 no.3
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• pp.191-202
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• 1989

This study was carried out to investigate the relationship between soil mites(Acarina:Cryptostigmata) and vegetation in sampled area. From July 1984 to June 1985, samples were taken monthly from coniferous forests; a pinenut (Pinus koraiensis S. et Z.) forest (site C-1), a whitepine(Pinus strobus L.) forest (site C-2), a needle fir tree(Abies holophyla Max.) forest (site C-3), and three broad-leaved forests; site B-1, B-2, and B-3 in Cholanamdo province, southerm part of Korea. Vascular plants of 152 species belonging to 115 genera (53 families) were identified. The flora in the coniferous forests were more diverse than in the broad-leaved forest. Similarity coefficient to the flora was shown highly between the neighbouring sites. The oribatid species in the coniferous forests were more diverse than those in the broadleaved forests. The similarity index suggested that oribatid mites in those surveying sites could be divided into "coniferous forest type" and "broad-leaved forest type".d forest type".uot;.

• Biomedical Science Letters
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• v.22 no.4
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• pp.211-214
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• 2016

House dust mite is an essential allergen in the pathogenesis of allergic diseases. Abnormal regulation of neutrophil apoptosis is an important pathogenic process in allergic diseases. In the present study, we investigated the effects of house dust mites on spontaneous apoptosis of neutrophils and its associated mechanisms. Extract of Dermatophagoides pteronissinus (DP) inhibited neutrophil apoptosis in a time-dependent manner. Cycloheximide (CHX), an inhibitor of translation, increased apoptosis of DP-treated neutrophils as well as control cells. The pro-apoptotic effect of CHX was blocked by DP in neutrophils. In addition, DP increased the phosphorylation of Bad in a time-dependent manner, indicating that it exerted an inhibitory effect on the function of Bad. These results suggest that DP has anti-apoptotic effects of neutrophils and may regulate protein synthesis and activation of Bad. Moreover, these findings may shed light on elucidation of allergy pathogenesis due to house dust mites.

• Journal of Species Research
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• v.5 no.3
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• pp.324-332
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• 2016

Two feather mites, Zachvatkinia larica Mironov, 1989 and Ardeacarus ardeae (Canestrini, 1878) are reported for the first time in Korea. Specimens of Z. larica and A. ardeae were collected from the blacktailed gull Larus crassirostris and little egret Egretta garzetta, respectively. The genera Zachvatkinia Dubinin, 1949 and Ardeacarus Dubinin, 1951 are new to this country. Here, we provided morphological descriptions and illustrations of these two species. Additionally, we provide the partial sequences of the mitochondrial cytochrome c oxidase subunit I (COI) as DNA barcode markers.

• Journal of Species Research
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• v.6 no.spc
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• pp.177-184
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• 2017

Two feather mites, Scutomegninia phalacrocoracis Dubinin and Dubinina, 1940 and Ptiloxenus major ($M{\acute{e}}gnin$ and Trouessart, 1884) are reported for the first time in Korea. Specimens of S. phalacrocoracis and P. major were collected from the great cormorant, Phalacrocorax carbo and great crested grebe, Podiceps cristatus, respectively. The genera Scutomegninia Dubinin, 1951 and Ptiloxenus Hull, 1934 are also new reports for South Korea. Here, we provide morphological descriptions and illustrations of these two species. Additionally, we provide partial sequences of the mitochondrial cytochrome c oxidase subunit I (COI) as DNA barcodes.