ISSN 1362-1971
An international journal of the Systematic and Applied Acarology Society, published since 1996
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ISSN 1362-1971 An international journal of the Systematic and Applied Acarology Society, published since 1996 [Aims] [Editors] [Content] [Subscriptions] [Contact details] [Society Homepage] |
Systematic & Applied Acarology (2002) 7, 69-76The effects of temperature on the development and reproduction of
Tetranychus piercei McGregor (Acari: Tetranychidae) in bananaYUEGUAN FU, FANGPING ZHANG, ZHENGQIANG PENG, KUI LIU & QIAN JIN
Plant Protection Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, Hainan, China
Abstract
Observations on the development, survivorship and reproduction of Tetranychus piercei McGregor reared on
fresh banana leaves were conducted at 16, 20, 24, 28, 32 and 36°C. The developmental time from egg to adult
varied from 7.2 d at 32°C to 33.1 d at 16°C. The developmental threshold temperatures of egg, larva,
protonymph, deutonymph, preoviposition and a whole generation were 11.2, 9.8, 11.9, 12.5, 13.3 and 10.7°C,
respectively. The effective accumulated temperatures were 72.3, 33.6, 22.2, 27.8, 17.7 and 163.6 day-degrees,
respectively. Within the range of 16 to 36°C, the relationships between developmental and survival rates of all
immature stages, average number of eggs/female, longevity of adults and temperatures showed parabolic trends.
Survival rate was the highest (96.1%) at 32°C; whereas at 36 and 16°C it decreased to 79.1 and 66.4%,
respectively. The highest number of eggs (35.8 eggs/female) was recorded at 28°C; and the lowest at 16°C (17.9
eggs/female). Female longevity was the longest (34.5 d) at 20°C and the shortest (8.2 d) at 36°C. The net
reproductive rate (R 0 ) was the highest (23.6525) at 28°C and the lowest (5.1044) at 36°C. The intrinsic rate of
increase (r m ) and finite rate of increase (l) reached maximal values (0.3488 and 1.4174 respectively) at 32°C,
whereas minimal values (0.0724 and 1.0752 respectively) were at 16°C. The mean generation time and time for
population doubling were the shortest at 36 and 32°C, respectively, which were 7.2192 d and 1.9871 d. The
highest population trend index (25.28) was obtained at 28°C and the lowest (4.88) at 36°C. These population
parameters and population trend indices increased with temperatures in a parabolic function. The results suggest
that T. piercei could develop and reproduce within a wide range of temperatures, and that temperatures from
25.8-32°C are the most suitable conditions for the development, survival and reproduction of the mite.
Key words: Tetranychus piercei McGregor, temperature, development, reproduction, survival
Copyright 1999-2002 Systematic and Applied Acarology Society
Last updated 15 Jul. 2002
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