• The Korean Journal of Soil Zoology
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• v.11 no.1_2
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• pp.7-12
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• 2006

Asthma and allergic rhinitis due to outdoor spider mites are major health problems worldwide. The sensitization route to spider mites has not yet been well elucidated. We examined the microstructure of faecal pellets and silk of the two-spotted spider mite, Tetranychus urticae, using a field emission scanning electron microscope. Black and white pellets of the two-spotted spider mites faeces contain a large amount of plant pigment waste products. Black faecal pellets are strawberry-shaped. White faecal pellets are silken threads. These pellets are likely to be the source of allergens of relevant mites because desiccated faeces particles probably disintegrate and become incorporated into dust particles more readily than whole bodies or encased internal organs. We conclude that the importance of spider mites in respiratory allergy needs emphasis.

• Korean Journal of Environment and Ecology
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• v.24 no.3
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• pp.258-263
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• 2010

To study on the typical domatia structure, the leaves of six broad-leaved tree species were examined. Domatia of the leaves of the broad-leaved trees is the defense strategies against hervivory of many broad-leaved tree species. We observed four type domatia; Pouch type, Tuft type, Pocket type, and Pocket + tuft type. This result suggests that broad-leaved trees have develope leaf domatia structures for mutualism with predatory mites.

• The Korean Journal of Ecology
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• v.10 no.2
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• pp.81-89
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• 1987

This study was carried out to inverstigate the oribatid fauna at Mt. Moak near Chonju, Korea. Samples were taken from 4 sites at the north sides, 200, 300, 500 and 600 above sea levels and south sides, 200, 400, 600, and 700m above sea levels. The results were as follows: Oribatid mites of 37 families, 62 genera, 118 species were collected in this study. Numbers of species were less at high level than at low level sites. Species diversity index was less at high level than at low level sites, and less at the south than at the north side. Species similarity index indicated that there are two types, i.e. "high sea level type", and "low sea level type" at Mt. Moak. According to the MGP analysis-I, most of the sites belonged to "Type G". "Group M" and "Group P" appeared more in the lower level sites.up P" appeared more in the lower level sites.ites.

• Korean journal of applied entomology
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• v.39 no.4
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• pp.267-274
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• 2000

As the pest of the citrus in Cheju, 69 insect species and 5 animal species were investigated during 1996 to 1998. Of these, Panonychus citri, Phyllocnistis citrella, Aphis citricola, Aphis gossypii and Frankliniella occidentalis are major pests. Especially, F. occidentalis and Peridroma saucia are very important species because of increasing damage. The number of pests species injuring leaf, branch, fruit and flower of the citrus are 36, 16, 41 and 2 species respectively. The rate of damaged fruits by pests is 20.5% in 1997 and 18.6% in 1998 and the rate of bad quality fruits is 6.4% and 6.7% respectively.

• Animal Systematics, Evolution and Diversity
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• no.nspc3
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• pp.45-58
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• 1992

Tetranychoid mites found from Korea until now are 42 species belonging to 12 genera, 2 families as follows: 1 Bryobia japonica Ehara et Yamada, 2. B. praetiosa Koch, 3. B. rubrioculus(Scheuten), 4. Petrobia latens(Muller), 5. Aponychus corpuzae Rimando, 6. A firmianae(Ma et Yuan). 7. Panonychus citri(McGregor), 8. P. ulmi(Koch), 9. Eotetranychus carpini Oudemans, 10. E. hicoriae(McGregor), 11. E. populi(Koch), 12. E. rubiphilus (Reck), 13. E. sexmaculatus (Riley), 14. E. smithi Pritchard et Baker, 15. E. tiliarium (Hermann), 16. E. uchidai Ehara, 17. Schizotetranychus bambusae Reck, 18. S. celarius(Banks), 19. S. leguminosus Ehara, 20. Oligonychus aceris(Shimer), 21. O. clavatus(Ehara), 22. O. hondoensis(Ehara), 23. O. ilicis(McGregor), 24. O. karamatus(Ehara), 25. O. orthius Rimando, 26. O. peridtus Pritchard et Baker, 27. O. shinkajii Ehara, 28. O. pustulosus (Ehara), 29. O. ununguis(Jacobi), 30. O. sp. 31. Tetranychus kanzawai Kishida, 32. T. phaselus Ehara, 33. T. truncatus Ehara, 34. T. urticae Koch, 35. T. vienensis Zacher, 36. Aegyptobia nothus Pritchard et Baker, 37. Pentamerismus taxi (Haller), 38. P. oregonensis McGregor, 39. Brevipalpus californicus(Banks), 40. B. lewisi McGregor, 41. B. obovatus Donnadieu, 42. Tenuipalpus zhizhilashviliae Reck. On the above species, a taxanomic key was made and ecological data including distribution and host plant are presented in this paper.

• Korean Journal of Veterinary Research
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• v.23 no.2
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• pp.187-191
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• 1983

In the course of surveying the internal parasites of domestic animals, a large number of eggs and mites were detected in the feces and feeds of cattle, pigs, chickens and ducks. Three kinds of mites were identified in the present studies: Acarus siro (Linnaeus), Tyrophagus putrescentiae (Schrank) and Cheyletus malaccensis (Oudemans). The eggs of the mites were similar to those of flukes. In the fecal examination, therefore, it is necessary to differentiate the mite eggs from fluke eggs. The mites found in the present studies live by organic materials. Thus, they were found in the mixed commercial animal feeds. The spoiling of animal feeds by these mites remains to be verified. The damage of the gut epithelium of animals by these adult mites has to be examined more thoroughly, although macroscopic changes were not detected in the present studies. In the commercial animal feeds, the mites were largely found during the warm, humid seasons. As these mites can cause dermatitis in man, care should be taken not to contact continuously with the contaminated feeds.

• Journal of Korean Society of Forest Science
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• v.72 no.1
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• pp.1-8
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• 1986

This study was carried out to classify the arthropods inhabited in pine mushroom (Tricholoma matsutake Singer). The arthropods were collected in a state forest (196 compartment, 157ha) located in Yangyang-gun, Kangwon-do. After collection the arthropods were classified in laboratory. The results obtained are summarized as follow; 1. Insects inhabited in pine mushroom are in total 19 Families of 7 Orders. Some animals in Araneina, Acarina, Nematoda and Stylommatophora were also observed, 2. The most injurious pests are Gyrophaena niponensis, Elateridae, Deosophilidae and Philomycidae (Stylommatophora). 3. The most dominant species is Gyrophaena niponensis (Staphylinidae, Coleoptera). 4. Some possible natural enemies are Oxyporus germanus, Sphedanolestes impressicollis, Phoridae, Carabidae, Pteromalidae, Eulophidae and Araneina.

• The Korean Journal of Ecology
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• v.10 no.1
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• pp.23-31
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• 1987

This study was carried out to investigate by the MGP analysis the composition of oribatid mite in coniferous and broad-leaved forests, Kwang Yng experiment plantation, Chola Nam Do Province, southern part of Korea. In these study area, 157 species of oribatid mites (Acari: Cryptogimata) were identified. Among them 6 species such as; Brachychochthonius jugatus JACOT, B hungaricus BALOGH, Eremulus translamealtus BALOGH et. MAHUNKA, Brachioppiella ctenifera GOLOSOVA, Striatoppia opuntiseta BALOGH et. MAHUNKA, Suctobelba perdentata baculifer BALOGH et. MAHUNKA have not been described in Korea. Species compositions were as follows; Among them 69 species were found in all the six sampling sites, 33 species scattered sporadically in all the area, 12 species found in coniferous forest, 10 species in broad-leaved forest only, and 33 species sampled at one site. According to the MGP analysis I, site B-1, B-2, and B-3 were found to be "Type G" and site C-1, C-2, and C-3 were "Type MG". According to the MGP analysis II, site B were found to be all "Type G". But site C-1 was "Type MG", C-2 was "Type M" and C-3 was "Type G" suggesting that "Group M" increased in the site C.e G" suggesting that "Group M" increased in the site C. in the site C.

• Korean journal of applied entomology
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• v.44 no.2
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• pp.91-95
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• 2005

This study was conducted to investigate the morphological characteristics, overwintering sites and behavior for each stage of Oligota kashmirica benefica (Coleoptera: Sthphylinidae). Egg was oval type, yellow, 0.3 mm size. Larva exuviated 3 times and the last (3rd) instar, length 1.6 mm, wide 0.4 mm, became dermata pupa in soil. Adult was lightish dark-brown, and coriaceous forewing covered a half of abdomen. O. kashmirica benefca mainly overwinters with adult at Japanese cedar (Cryptomeria japonica) windbreaks of orchards, but it did not diapause in greenhouse during winter.

• Journal of the Korean Chemical Society
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• v.10 no.4
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• pp.149-152
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• 1966

An insecticide was obtained by condensation of chloral hydrate with p-chloroanisole. The structure of the insecticide was found to be 2,2-bis(2-methoxy-5-chlorophenyl)1,1,1-trichloroethane(M.C.T.). The best conditions for this condensation reaction were as follows: 1) The sulfuric acid concentration: 93% 2) The mole ratio of sulfuric acid to p-chloroanisole: 8 3) The mole ratio of chloral hydrate to p-chloroanisole: 0.7 4) The reaction time and reaction temperature: 12 hrs and 25-30$^{\circ}C$ The insecticidal effects of M.C.T against the Citrus Red Mite and Chrysanthemum Aphid were five times as strong as D.D.T.