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Effect of Varying Temperature on the Survival and Fecundity of <I>Coccinella septempunctata</I> (Coleoptera: Coccinellidae) Fed on <I>Lipaphis erysimi</I> (Hemiptera: Aphididae)

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Author(s): Arshad Ali | Parvez Qamar Rizvi

Journal: Journal of Entomology
ISSN 1812-5670

Volume: 5;
Issue: 2;
Start page: 133;
Date: 2008;
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Keywords: Coccinella septempunctata | fecundity | survival | Varying temperatures | Lipaphis erysimi

ABSTRACT
Coccinella septempunctata at varying temperatures viz., 181, 241C and 281C coupled with 655% RH and 12 h L: 12 h D photoperiod under laboratory condition was made for two successive generations. The highest potential fecundity and net reproductive rate of C. septempunctata were obtained at 241C (165.67 eggs/female and 41.09 females/female/generation, respectively) and the lowest at 281C (146.63 eggs/female and 29.70 females/female/generation, respectively). Finite, intrinsic and annual rate of increase were however, found maximum at 281C (1.0876, 0.0840 females/female/day and 2.04x1013/annum, respectively) and minimum at 181C (1.0794, 0.0764 females/female/day and 1.281x1012/annum, respectively). The mean length of generation and doubling time was found minimum at 281C (40.77, 8.26 days, respectively) and maximum at 181C (48.27 and 9.08 days, respectively).]]>
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