• Animal Systematics, Evolution and Diversity
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• v.3 no.2
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• pp.64-116
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• 1987

The purpose of the present paper is to record taxonomic notes on several Korean spider mites. The specimens on which this study is based were collected by the authors during the period from May, 1986 to June, 1987. The following species are the spider mites concerned in this paper. 1. Panonychus citri (McGregor), 2. Eotetranychus populi Koch, 3. Eotetranychus smithi Pritchard and Baker, 4. Shizotetranychus bambusae Reck, 5. Schizotetranychus celarius (Banks), 6. Shizotetranychus leguminosus Ehara, 7. Oligonychus orthis Rimando, 8. Tetranychus ranzawai Kishida, 9. Tetranychus phaselus Ehara, 10. Tetranychus trancatus Ehara , 11. Tetranychus vienensis Zacher, 12. Tetranychus urticae Koch . Among them, eight species with asterisk are newly recorded from Korea . In addition, empodiums of pretarsus were carefully observed and enzyme patterns by electrophoresis were compared on some species in order induce their systematic inter-relationship at either species or generic level.

• Korean Journal of Plant Taxonomy
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• v.33 no.4
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• pp.411-420
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• 2003

To examine the seed morphology in Korean Orobanchaceae, seeds of 5 species including 1 variety in five genera and one related taxon, Boschniakia himalaica Hook. f. & Thomson in Hook. f. from the Himalaya (7 taxa in total) were investigated by scanning electron microscopy (SEM). Two different seed types are recognized depending on three characters (e.g, .the seed size, seed coat structure and seed number per fruit). - Type I: size less than 1mm, seed coat structure reticulate and seed number per fruit more than ca. 1,000; Type II: size more than 1 mm, exotesta irregularly crested and seed number per fruit less than 1,000 (Lathraea japonicu Miq.). In Type I, three subtypes of exotesta internal surface pattern can also be classified; (1) Subtype Ia: reticulate - include irregularly striate (Ia') and deeply reticulate (Ia"), (2) Subtype Ib: foveolate, (3) Subtype Ic: smooth. Systematics application of the seed morphological data for the Korean Orobanchaceae is also briefly discussed.

• The Korean Journal of Mycology
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• v.45 no.1
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• pp.1-13
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• 2017

Armillaria species are non-obligate root pathogens, as well as facultative parasites. The genus consists of about 40 species with worldwide distribution that are difficult to identify morphologically. Their hosts include conifers, hardwoods, vines, and even herbs. These fungi contribute to natural thinning and succession of vegetation in forests and decompose wood to develop edible fruiting bodies from spring to autumn. Its genets have a lifespan of up to 2000 years and have been found to occupy as much as 960 ha of forest land. Recently, forest tending work such as thinning of forests has resulted in the creation of tree stumps that support the growth of Armillaria, and these mushrooms have become an income source in mountainous areas. Therefore, identification of these species is needed. We review the difficulties in identification, suggest a species identification key for Korean indigenous species, and discuss the significance of Armillaria in terms of forest ecology and plant pathology.

• Korean journal of applied entomology
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• v.7
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• pp.33-37
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• 1969

This experiment was conducted to investigate the vriabibities of the pupal weight and the number of eggs in the ovary of the fall webworm, Hyphantria cunea Drury. collected from the seven different host plants in the field. The correlation between the pupal weight and the number of eggs in the ovary was studied in connection with the species of the host plants. The results obtained were as follows. I) The pupal eight was varied with the species of the host plants and sexes. The order of average female pupal weight was Populus euramericanal Guinier(206.6 mg). Juglans mandshurica Max. (J97.8 mg). Platanus orientalis L. (182.4 mg). Acer neugndo L. (172.2 mg). Taxodium distichum Rich. (172.1 mg). Salix babylonica L. (128.8 mg) and Prunus serrulata var. spontanea (Max). Wilson (103.4 mg). and of the average male pupal weight. T. distichum (125.2 mg). P. orientalis (123.5mg). J. mandshurica (114.4 mg). A. negundo (109.5 mg). Peuramericana (106.3mg). S. babylonica (94.3 mg). and P. serrulata var. spontanea(74.6 mg). The weight of female pupae was greater than that of male pupae in all case. 2) The unmber of eggs in the ovary was also vaied with the species of the host plants. The order of the average number of eggs in the ovary was P. euramericana(1331.1). J. mandshurica(I239.9). T. disichum (1237.0). A. negundo (1186.9). P. orientalis (1145.5), S. babylonica (800.0) and P. serrulata var. spontanea (641.5). 3) The number of eggs in the ovary for all the host plants tested was highly correlated with the pupal weight.

• Korean Journal of Plant Resources
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• v.37 no.4
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• pp.314-320
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• 2024

To speed up the extract of endoparasitic nematodes from roots, four extraction methods with or without root-grinding were compared; 1) immersion, 2) immersion + Air, 3) Oostenbrink dish, and 4) Mistifier. The experiments were conducted for nine days by using perilla roots infested with Pratylenchus vulnus. Root-lesion nematodes continuously extracted from perilla roots during the experiments and as much as 3-10% in 9^th days. The total number of nematodes extracted from 2 g of perilla root in nine days were varied among methods (379-1,824 nematodes); the most nematodes were extracted by root grinding + immersion + air (1,824) and the root-grinding + mistifier method (1,349) (p = 0.05). In the first two days of extraction, root-grinding + mistifier extracted the most nematodes (725 nematodes), followed by root-grinding + immersion + Air (555 nematodes), and root-grinding + Oostenbrink dish (421 nematodes). Root-grinding effected as much as 16-108% more nematodes extraction when compared to without root-grinding (p = 0.01).

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.13 no.4 s.109
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• pp.80-88
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• 1992

토마토의 병해는 우리나라에서 모두 13종이 알려져 있다. 그중에서 가장 피해가 큰 병해는 잿빛곰팡이병, 시들음병(위조병), 배꼽썩음병, 바이러스병이다. 이외에 잎곰팡이병, 겹둥근무늬병, 역병, 더뎅이병등이 발생하고 있으나 앞의 3가지 병해에 비하면 발생도 국부적이고 피해도 적다. 잿빛곰팡이병은 시설재배 농민들이 재배상 격고 있는 가장 큰 골칫거리중의 하나다. 일반노지재배에서는 장마철을 제외하고는 큰 피해는 없으나 시설재배의 저온다습한 환경과 관련하여 이 병이 대발생하여 흔히 큰 피해를 가져온다. 시들음병은 토양전염성 병해로 병원균은 외류의 덩굴쪼김병과 분류학상 같은 종류이나 병원성만 다른 곰팡이의 일종이다. 이 병은 토마토의 연작과 상관하여 그 발생이 점차 늘어나는 추세에 있다. 배꼽썩음병은 기생성인 생물에 의하여 발생하는 병은 아니지만 전염성이 있는 기생성 질병에 못지않게 많은 피해를 가져오는 병해다. 이외에도 피해가 큰 병해로 어느작물이든 문제가 되는 바이러스병해가 있다. 여기서는 농민들이 토마토재배에서 겪고 있는 문제병해를 중심으로 그 발생생태와 효과적인 방제대책을 알아본다.

• The Korean Journal of Pesticide Science
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• v.20 no.1
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• pp.56-65
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• 2016

Pine wood nematode, Bursaphlenchus xylophilus is a fatal damaging pest, infecting pinewood trees and is one of the serious forest pest in Korea. Trunk injection is one of the most effective method to protect the live pine trees from nematode infection. The aim of this research was to reveal the efficacy of the nematicidal materials from 46 Kyrgyzstan, 88 Vietnam plant materials and 21 active materials (${\alpha}$-terpinene, ${\alpha}$-pinene, ${\beta}$-thujaplicin, cinnamaldehyde, eugenol, emodin, geraniol, limonone, methyl palmitate, matrine, myrcene, methyl gallate, nicotine, quassin, resveratrol, rotenone, thymol, thujaplicin, terthiophene, tuberstemonine, ${\gamma}$-terpinene) isolated from plants for using as trunk injection agents. Eclipta prostrata extract was highly effective against pine wood nematode in plant extracts and terthiophene has the best nematicidal activity from active materials isolated from plants. Foliar spray of terthiophene on Japanese black pine (Pinus thunbergii) tree reduced proliferation of inoculated pine wood nematode at 22 days after treatment, however no efficacy was found over 22 days. Eclipta prostrata extract and terthiophene can be used as nematicide for further nematicidal efficacy test against any other plant parasitic nematodes and trunk injection efficacy against pine wood nematode.

• Korean Journal of Ecology and Environment
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• v.34 no.4 s.96
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• pp.292-297
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• 2001

As a part of study on the microalgal dynamics in a small pond in Hongsung, Chungnam, we found a massive bloom of chlorococcalean green alga, Dictyosphaerium pulchellum during the year-round survey from January 2000 to January 2001. D. pulchellum occurred at a low frequency throughout the year. However, D. pulchellum began to increase from 12 March, showed a peak of blooming with 59,200 colonies $mL^{-1}$ in 2 April, and abruptly decreased in 16 April. Colonies were 8-celled and 16-celled at early stage of blooming, 32-celled or 64-celled at the midst of blooming, and most of colonies consisted of 64 cells at the end of blooming. Colonies of D. pulchellum were healthy at the early stage of blooming, but most of colonies were infected with some parasites at the end of blooming. The infected cells bleached out with decomposing chloroplast and pyrenoids. The infection with parasites, together with irradiance and nutrient limitations, appears to stop D. pulchllum bloom. This is the first report on the occurrence of blooming of a green algal genus Dictyosphaerium and its infection with parasite in Korea.

• Korean journal of applied entomology
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• v.25 no.3 s.68
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• pp.175-182
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• 1986

A study was conducted to survey the fauna and the field density ofp lant parastic nematodes on important cash crops in Korea. Studies were carried out with sampling about five hundred grams of soil around roots of eighteen different kinds of crops from fifty five locations throughout the country. Nematodes were elutriated from over three thousand soil samples, and identified into sixteen different genera. Among them Ditylenchus species were found to be the most abundant in fields of garlic and onion, Helicoty-lenchus of sesame, chinese cabbage and mulberry, Meloidogyne of red-pepper, tomato, cucumber and peanut, Pratylenchus of mulberry and peach, Pratylenchus of apple, Chinese cabbage and radish, Trichodorus of potato, and Xiphinema of peach and potato. Field density of Meloidogyne species was increased with the longer continuous cultivation of red-pepper in the same field.

• Korean journal of applied entomology
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• v.31 no.4
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• pp.427-451
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• 1992

The nematodes associated with forest trees were surveyed in the National Parks and Mountains in Korea. A total of 73 species on 28 genera were identified from rhizosphere of 154 tree s species. Platycarya strobilacea, Ulmus davidiana and Acer ginnala were known to new host p plants of Meloinema kerongens. Bursaphelenchus xylophilus was detected only in Pusan on Pi$\pi$us t thunbergii, B. mucronatus was detected in Cheju, Masan, and Chinhae. Insect parasitic nemat todes, Prothallonema intermedium, on P. rigida in Daegu, P. thunbergii in Cheju city, Namwonu up, Gujoa-up and Aewol-up. The number of nematode species according to forest trees was t the highest on P. thunbergii to 32 species, followed by 24 species on Abies holophylla, 20 species on Zelkova serrata, 19 species on Diospyros kaki, 18 species on Quercus acutissima, respectively. L Localities of distribution according to nematode species were as follows; Crico$\pi$emella i$\pi$formis i in 81, X. americanum in 74, Tylenchorhynchus claytoni in 51, C. macrodora in 35, H Hemicriconemoides varionodus and Ogma serratum in 31, Pararotylenchus pini in 25, H Hemicycliophora koreana in 24, Aphelenchus avenae and C. pseudohercyniensis in 24, respectively.