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Author

C. I. Shih

Bio: C. I. Shih is an academic researcher. The author has contributed to research in topics: Population. The author has an hindex of 1, co-authored 1 publications receiving 15 citations.
Topics: Population

Papers

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14 Aug 2003
TL;DR: Greenhouses, plants and mites introduction to acari methods and techniques spider mites false spider mite tarsonemid mites eriophyoid mites acarid mite.
Abstract: Greenhouses, plants and mites introduction to acari methods and techniques spider mites false spider mites tarsonemid mites eriophyoid mites acarid mites.

371 citations

Journal ArticleDOI
TL;DR: The effect of four constant temperatures on biological (survival and duration of developmental stages, fecundity and longevity of females and sex ratio), demographic parameters and demographic parameters of Tetranychus evansi was studied in the laboratory under controlled conditions.
Abstract: The effect of four constant temperatures (21, 26, 31 and 36°C) on biological (survival and duration of developmental stages, fecundity and longevity of females and sex ratio) and demographic parameters (R0, G, rm and ) of Tetranychus evansi was studied in the laboratory under controlled conditions: 75 ± 10% RH and 12L : 12D. The lower thermal threshold was 10.3°C. The shortest developmental time (6.3 days) was obtained at 36°C. Maximum fecundity was recorded at 31°C with 123.3 eggs per female. The highest intrinsic rate of increase (rm) (0.355) was obtained at 31°C. The optimal temperature for population growth seems to be 34°C. © Rapid Science Ltd. 1998

85 citations

Journal ArticleDOI
TL;DR: Several phytoseiid mites and a chrysopid predator have been studied for control of spider mites with good effect and efforts to market these predators should be intensified so that biological control can be a real choice for farmers.
Abstract: Problems with spider mites first appeared in Taiwan in 1958, eight years after the importation of synthetic pesticides, and the mites evolved into major pests on many crops during the 1980s. Of the 74 spider mite species recorded from Taiwan 10 are major pests, with Tetranychus kanzawai most important, followed by T. urticae, Panonychus citri, T. cinnabarinus, T. truncatus and Oligonychus litchii. Most crops suffer from more than one species. Spider mites reproduce year-round in Taiwan. Diapause occurs only in high-elevation areas. Precipitation is the most important abiotic factor restricting spider-mite populations. Control is usually accomplished by applying chemicals. Fifty acaricides are currently registered for the control of spider mites. Acaricide resistance is a serious problem, with regional variation in resistance levels. Several phytoseiid mites and a chrysopid predator have been studied for control of spider mites with good effect. Efforts to market these predators should be intensified so that biological control can be a real choice for farmers.

52 citations

Journal ArticleDOI
TL;DR: The results confirm field observations linking E. willamettei damage to cooler, coastal vineyards and early in the season in inland vineyards, and T. pacificus infestations to hot vineyards in inland and coastal areas, and additional information on temperature effects on adult life history details of the two mites is needed.

19 citations

Journal ArticleDOI
01 Dec 2012
TL;DR: Development times and reproduction rates of the two-spotted spider mite Tetranychus urticae Koch were studied when fed on leaves of two pear varieties and sex ratio was affected by temperature as proportion of female increased, thus the reproduction of mites increased.
Abstract: Developmental times and reproduction rates of the two-spotted spider mite Tetranychus urticae Koch were studied when fed on leaves of two pear varieties (i.e. Lacont and Hood varieties) under laboratory conditions of 15, 20, 25 & 30 ± 2°C, 70% ± 5% RH. The longest developmental stages reached 30.6 and 30.1 days for female and male at 15°C when the T. urticae was fed on Lacont pear variety, while when reared on Hood pear variety it was 34 and 32.1 days at the same temperature. The highest total mean fecundity rate was recorded at 30oC (156.8 and 143.6 eggs /female). Sex ratio was affected by temperature as proportion of female increased. In addition, the values of rm and λ increased with temperature increase, while mean generation time (T) and generation doubling time (DT) values decreased with temperature increase, thus the reproduction of mites increased. This mite favored high temperature. The Lacont pear variety was more favored to this mite.

16 citations