Systematic & Applied Acarology
ISSN 1362-1971
An international journal of the Systematic and Applied Acarology Society, published since 1996


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Systematic & Applied Acarology (2002) 7, 69-76

The effects of temperature on the development and reproduction of Tetranychus piercei McGregor (Acari: Tetranychidae) in banana

YUEGUAN 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 36C. The developmental time from egg to adult

varied from 7.2 d at 32C to 33.1 d at 16C. 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 10.7C,

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 36C, 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 32C; whereas at 36 and 16C it decreased to 79.1 and 66.4%,

respectively. The highest number of eggs (35.8 eggs/female) was recorded at 28C; and the lowest at 16C (17.9

eggs/female). Female longevity was the longest (34.5 d) at 20C and the shortest (8.2 d) at 36C. The net

reproductive rate (R 0 ) was the highest (23.6525) at 28C and the lowest (5.1044) at 36C. The intrinsic rate of

increase (r m ) and finite rate of increase (l) reached maximal values (0.3488 and 1.4174 respectively) at 32C,

whereas minimal values (0.0724 and 1.0752 respectively) were at 16C. The mean generation time and time for

population doubling were the shortest at 36 and 32C, respectively, which were 7.2192 d and 1.9871 d. The

highest population trend index (25.28) was obtained at 28C and the lowest (4.88) at 36C. 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

25.8-32C are the most suitable conditions for the development, survival and reproduction of the mite.

Key words: Tetranychus piercei McGregor, temperature, development, reproduction, survival


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Last updated 15 Jul. 2002
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