• Title/Summary/Keyword: Tetranychidae

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Species Dominance of Tetranychus urticae and Panonychus ulmi (Acari: Tetranychidae) in Apple Orchards in the Southern part of Korea (남부지역 사과원내 점박이응애와 사과응애의 우점변화)

  • Choi, Kyung-Hee;Lee, Dong-Hyuk;Lee, Soon-Won;Yoon, Changmann;Lee, Sun-Young;Do, Yun-Su
    • Korean journal of applied entomology
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    • v.53 no.4
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    • pp.415-425
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    • 2014
  • This study investigated population fluctuations in two mite species in apple orchards over 20-year period. The occurrence of two major mite pests infesting apple trees, two-spotted spider mite Tetranychus urticae and European red mite Panonychus ulmi (Acari: Tetranychidae), was investigated from 1992 to 2011 in major apple-producing districts, including four to eight cities, in the southern part of the Republic of Korea. The 20-year trend revealed that more orchards were infested by T. urticae from 1992 to 1999, but thereafter P. ulmi became dominant. The observed mean density of P. ulmi was consistent, whereas that of T. urticae fluctuated during this period. The analysis of occurrence in four time periods reveals that the density of T. urticae decreased after 2002. The monthly sampling, revealed that the density of P. ulmi was higher in April, whereas the density of T. urticae was higher from May to August. This change may be due to a change in the frequency of pesticide spraying, ground vegetation management, a decrease in nitrogen fertilization, and the overall orchard management practices. However, this projection should be examined in more detail. On the basis of the findings of this study, it can be concluded that cultural practices, including fertilization, and environmental changes, such as pesticide spray frequency and integrated pest management practices, affect species dominance and population densities of the two mite species in apple orchards.

Acaricidal Efficacy of Herbal Extracts against Tetranychus urticae (Acarina: Tetranychidae) (점박이응애, Tetranychus urticae (Acarina: Tetranychidae)에 대한 약용식물 추출물의 살비 효과)

  • Lee, Jung-Su;Ham, Eun-hae;Choo, Ho-Yul;Lee, Suk-Jun;Lee, Dong-Woon
    • Journal of agriculture & life science
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    • v.45 no.6
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    • pp.151-162
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    • 2011
  • Methanol and hexane extracts from 35 species in 27 families of herbal plants were evaluated for their acaricidal activities against two-spotted spider mite, Tetranychus urticae by leaf-dipping and spraying methods in laboratory, pot and field, respectively. Acaricidal activities were different depending on herbal plants. When T. urticae was released on leaves of Phaseolus vulgaris var. humilis that were dipped in the 1,000 ppm hexane extracts from fruits of Torreya nucifer and Daphan genkwa, seeds of Xanthium strumarium and Pharbitis nil at one minute they experienced 56.8, 47.8, 47.7, and 47.7% mortalities, respectively. Dipping time influenced acaricidal activity, that is, one minute dipping was more effective than 30 second dipping of Phaseolus vulgaris var. humilis leaves. However, extracts of X. strumarium and P. nil seeds had comparatively high activities. Concentration of hexane extract of X. strumarium and P. nil seeds revealing LC50 were 1,824 and 1,899 ppm, respectively. Extracts of both plants from hot and cold water were not effective representing <20% mortality at 1,000 ppm. However, hexane extracts of X. strumarium and P. nil seeds were effective against T. urticae on P. vulgaris var. humilis representing 76.3 and 71.3% mortalities in pot, respectively. Control effects of hexane extract of P. nil seed were 50.8 and 35.1% at 2,000 and 1,000 ppm against T. urticae on Chrysanthemum morifolium in greenhouse, respectively.

Susceptibility of Tea Red Spider Mite, Tetranychus kanzawai (Acari: Tetranychidae) to Cyenopyrafen (차응애의 cyenopyrafen에 대한 감수성)

  • Paik, Chae-Hoon;Kim, Sang-Soo
    • The Korean Journal of Pesticide Science
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    • v.14 no.2
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    • pp.170-174
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    • 2010
  • The acaricidal activity of cyenopyrafen on the tea red spider mite, Tetranychus kanzawai was evaluated in laboratory and field studies. In the laboratory, cyenopyrafen was highly effective against egg, larva, protonymph and adult female of T. kanzawai. In surviving adult females of T. kanzawai exposed to cyenopyrafen, we observed significant reduction in reproduction and no egg hatch. Effectiveness of cyenopyrafen against adult female of T. kanzawai on bean leaves was lasted for 15 days at treatments of 125 and 83.3 ppm. In a field study, cyenopyrafen exhibited excellent activity to mixed developmental stages of T. kanzawai. Based on the results, cyenopyrafen could be used for the control of T. kanzawai and treatment of this acaricide at 83.3 ppm was recommended as the field rate.

Taxonomic Studies on Spider Mites (Tetranichidas: Acarina) of III. Spider Mites Parasitic on Conifers (한국산 응애과(거미강: 진드기목)의 분류학적 연구 3. 침엽수에 기생하는 응애류)

  • Lee, Won-Koo;Lee, Byung-Hoon;Kim, Byung-Jin
    • Animal Systematics, Evolution and Diversity
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    • v.5 no.1
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    • pp.13-24
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    • 1989
  • Specimens of spider mites parasiting on conifer trees were collected from Korea during the period from May, 1986 to June, 1988. As a result, seven species belonging to the tribe Tetranychini, subfamily Tetranychinae, family Tetranychidae were identified as follows: 1. Panonychus citri(McGregor, 1916), *2. Oligonychus clavatus(Ehara,1959), *. O.hondoensis(Ehara,1954), *4. O.pustulosus Ehara, 1962, 5. O.karamatus(Ehara, 1956), 6. O.perditus Pritchard and Baker, 1955, 7. O. ununguis(Jacobi, 1905). Of which, three species with asterisk are newly recorded from Korea.

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Fuctional Response of Amblyseius longispinosus (Acari:Phytoseiidae) to Tetranychus urticae (Acari: Tetranychidae): Effects of Prey Density, Distribution, and Arena Size (긴털이리응애의 점박이응애에 대한 기능반응: 피식자 밀도, 분포 및 면적크기의 영향)

  • 김동순;이준호
    • Korean journal of applied entomology
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    • v.32 no.1
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    • pp.61-67
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    • 1993
  • Experiments were conducted to study the functional response of Amblyseius longispinosus Evans to egg densities (10-80) of Tetranychus urtica Koch under different egg distributions (clumped & uniform) and arena sizes (3, 9 & 16 $cm^2$). The searching success of A. longispinosus was affected by the spatial distribution and density of the prey but not by the arena size. there was a highly significant negative correlation (r=-0.85; p=0.0001) between predation amount and distances between preys. The predation response showed a type III functional response. The random predator equation satisfactorily described A. longispinosus predation. The search rate ranged from 0.1030 to 0.1504 under distribution of the prey while it ranged from 0.0546 to 0.276 under uniform distribution.

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Microstructure of Faecal Pellets and Silk of the Two Spotted Spider Mite, Tetranychus urticae (Tetranychidae: Acarina) (점박이응애 분비물의 미세구조)

  • Shin, Hee-Kwan;Yoo, Sea-Hee;Lee, Won-Koo;Park, Joong-Won;Lee, In-Yong
    • 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.

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Joint Toxic Action of Acaricide Mixtures to the Field-Collected Strain of Tetranychus urticae(Arcarina: Tetranychidae) (야외계통의 점박이응애(Tetranychus urticae)에 대한 살비제 혼합의 연합독작용)

  • 김상수;김도익;이승찬
    • Korean journal of applied entomology
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    • v.32 no.2
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    • pp.176-183
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    • 1993
  • These sutdies were conducted to investigate the joint toxic action of mixtures of several acaricides including amitraz, bifenthrin, propargite, fenbutatin dxide and bxide dicofol to the field-collected strian of Tetranychus urticae. The synergistic action of acaricidal mixtures was greatly varied with the kind of acaricide combinations and their mixture ratios. The combinations of amitraz with each of the tested acaricides were synergized at the given mixture ratios. The higher synergistic action in the each combination was observed at 2 : 8 ratio of amitraz and bifenthrin, 8 : 2 ratio of amitraz and fenbutatin oxide, 4 : 6 ratio of amitraz and propargite and 6 : 4 ratio of amitraz and dicofol.

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foraging behavior of Amblyseius longispinosus (Acarina;Phytoseiidae) for Tetranychus urticae (Acarina: Tetranychidae) Eggs (점박이응애(Tetranychus urticae) 알에 대한 긴털이리응애 (Amblyseius longispinosus)의 채식행동)

  • 김동순;이준호
    • Korean journal of applied entomology
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    • v.33 no.1
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    • pp.33-38
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    • 1994
  • The expenment was conducted to study the foraging behavior of Amblyseius hngisp~nosus for eggs of Tetranychus urticoe. When preys were abundant, A. longispinosus repeated a series of foraging process (feeding, after-feeding movement, restmy, and searching) The time (Mean\ulcorner SD) spent for these components were 6 83+ 1.73. 3 OOi 1.66. 93.57+ 30 19. and -0.00 min., respectively. Afterfeeding movement was chractetired as a complex one-way circular moving path with a slow speed (0.09 mm/sec) and area-restricted Escaping movement was fast (0 31 mm/sec), more straight in direction, and edge-oriented walking. Positions of prey consumption of A. longispinosus were distributed in clump. KEY WORDS Foraging behavior, nlovlng path, Arnblyseius longispinosus, Tetranychus urtlcae.

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Development of Acaricidal Resistance and Esterase Isozyme of Tetranychus urticae (Acarina : Tetranychidae) (점박이응애의 살비제저항성 발달과 Esterase Isozyme에 관한 연구)

  • 김상수;이승찬
    • Korean journal of applied entomology
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    • v.29 no.3
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    • pp.170-175
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    • 1990
  • These studies were conducted to examine the mechanism of acaricidal resistance in the twospotted spider mite (Tetranychus urticae Koch). The resistant strains were obtained by succssive selection of five acaricides including carbonphenothion and ethion of organophosphorus compound, dicofol of organochlorine compound, cyhexatin of compound and biphenthrin of synthetic pyrethroid. Esterase isozymes were separated by polyacrlyamide gel susceptible strains. The differences of the esterase isozymes of the resistant strains were Est. 1, Est. 3 in the carbonphenothion-selected strain, Est. 3 in the ethion- and the cyhexatin-selected strains, Est. 1, Est. 3, Est. 7 in the dicofol-selected strain, Est. 7 in the biphenthrin-selected strain as compared to the susceptible strain. With the difference of electrophoretic bands and their activities, esterases were related to the resistant mechanism of tested acaricides.

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A Preliminary Study on the Biological Control of Tetranychus kanzawai Kishida in Angelica utlis Makino by Phytoseiulus persimilis Anthias-Henriot (Acarina: Tetranychidae, Phytoseiidae) (신선초에서 칠레이리응애에 의한 차응애의 생물적 방제 예비실험)

  • 김용헌;김정환;한만위
    • Korean journal of applied entomology
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    • v.38 no.2
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    • pp.151-155
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    • 1999
  • Biological control of Tetranychus kanzawai by Phytoseiulus persimilis on the Angelica utilis was done in 'walk-in' plastic tunnels. The population of T. kanzawai nymphs and adults per 4 cm2 in damaged leaf decreased from 25 mites on July 22 after 25 predatory mites per m2 were released on July 23 to 0.4 mites on September 9 and then rose to 9.3 mites on October 16, 1997. Phytoseiulus persimilis could suppress T. kanzawai to low population level from August 13 to October 1.

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