Formosan Entomologist (2009) 29, 13-23

Wen-Jer Wang and Ming-Ying Lin (2009)
[Temperature-dependent life history of Tenuipalpus pacificus (Acariformes: Tenuipalpidae) on Phalaenopsis sp.]
Formosan Entomologist 29 (1), 13-23
Abstract: The life history of Tenuipalpus pacificus on Phalaenopsis sp. was studied at 24, 28, 32, and 36°C, with 80 ± 5% RH and a 12-hr/day photoperiod under laboratory conditions. The egg stage was 20.2 days at 24°C, but it was only 6.7 days at 36°C. The developmental period of the larva stage ranged from 9.4 days at 24°C to 3.7 days at 36°C. The developmental period of the protonymph stage was between 8.6 days at 24°C and 3.9 days at 32°C. The developmental period of the deutonymph stage ranged between 10 days and 4.1 days. The developmental periods of the immature stage was 48.4 days at 24°C, and 31.8, 22.6, 19.4 days at 28, 32, and 36°C respectively. The longevity of the male and female stages was between 42.7 to 14.0 days and 42.9 to 21.2 days respectively. The average fecundity was 10.6, 31.3, 35.9 and 6.2 eggs/female at 24, 28, 32 and 36°C, respectively. The low temperature thresholds of the egg, larva, protonymph, and deutonymph stages were 18.6, 17.0 and 17.4°C respectively, and the thermal summation of each stage was 122.2, 74.3 and 56.6 degree-day respectively. The low temperature threshold and thermal summation of the immature stage were 16.2°C and 374.5 degree-days, respectively. It has been estimated that 9 generations can occur in orchid greenhouse annually The intrinsic rate of increase (r) was 0.0195, 0.0531, 0.0578, and 0.0411 d^-1 at 24, 28, 32, 36°C respectively. The net reproduction rate (R_o) was 3.6, 3.9, 8.4, and 3.1 eggs/female, respectively. The mean generation time (T) was 65.8, 49.5, 36.9 and 27.7 d at 24, 28, 32, and 36°C; respectively.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Ming-Ying Lin

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tenuipalpus pacificus	Phalaenopsis (crop)	Taiwan