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Asian Journal of Agricultural Research

Year: 2008 | Volume: 2 | Issue: 1 | Page No.: 25-31
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Authors

Syed Kamran Ahmad

Arshad Ali

Parvez Qamar Rizvi

Keywords

Research Article

Influence of Varying Temperature on the Development and Fertility of Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) on Cabbage

Syed Kamran Ahmad, Arshad Ali and Parvez Qamar Rizvi
A laboratory study was conducted to find out the development and fertility of Plutella xylostella at varying temperatures (20±1, 25±1 and 20/25±1°C, coupled with 70±5% RH and 12 h L: 12 h D). The observations of two successive generations revealed that P. xylostella registered maximum life span of 33.13±1.494 days at 20±1°C, followed by 30.75±1.513 days at 20/25°C and 28.84±1.847 days at 25±1°C. When, a comparison was made between the developmental stages of P. xylostella at different temperature, it ranged from 3.0-4.0, 8.0-13.0, 1.0-1.5, 4.0-6.0 and 5.0-15.0 days at egg, larval, prepupal, pupal and adult stage, respectively. Although, the minimum temperature (20±1°C) influenced the highest natality (11 days) of the female, it also persuades highest fecundity of 104.42 eggs/female against the lowest of 78.26 eggs/female at 25±1°C. Similarly, mean length of generation of P. xylostella also attained high value of 27.92 days at 20±1°C and the low of 24.70 days at 25±1°C. However, P. xylostella exhibited a markable variation in different rates of increase (intrinsic, finite and annual) at different temperatures; it scheduled high value at fluctuating temperature (20/25±1°C) in comparison to constant temperature (20±1 and 25±1°C). Likewise, a high carrying capacity (26.57 female/female/day) was also observed at fluctuating temperature (20/25±1°C), against the low (18.52 female/female/day) at 25±1°C. Therefore, the temperature is a crucial abiotic factor, governs the certain biological attributes of various insects. Both minimum and fluctuating temperatures favor the development and survival of Plutella xylostella on cabbage under controlled condition.
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