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Influence of Temperature on Age-Specific Fecundity of the Ladybeetle Micraspis discolor (Fabricius)

  • OmkarEmail author
  • Ahmad Pervez
Research Article

Abstract

The influence of temperature on the age-specific fecundity of an aphidophagous ladybeetle, Micraspis discolor (Fabricius) (Coleoptera: Coccinellidae) feeding on the cowpea aphid, Aphis craccivora Koch (Homoptera: Aphididae) at four different temperatures, viz. 20, 25, 27 and 30°C, was investigated. The age-specific fecundity function was triangular and oviposition rate (no. of eggs/day) increased with increase in reproductive age of the ladybeetle, attaining a peak then gradually decreasing before finally ceasing. Young adults were more efficient at converting aphid biomass into eggs than older ones. The oviposition peak tended to shift towards younger females and the oviposition rate increased with increase in temperature from 20 to 27°C. The maximum fecundity and percent egg viability was 750 eggs and 95% at 27°C and minimum 385 eggs and 65% at 20°C, respectively.

Key Words

ladybeetle Micraspis discolor predator aphids temperature fecundity 

Résumé

L’influence de la température sur l’évolution de la fécondité de la coccinelle aphidiphage Micraspis discolor (Fabricius) (Coleoptera: Coccinellidae) se nourissant sur le puceron du niébé, Aphis craccivora Koch (Homoptera: Aphididae) a été étudiée à quatre températures différentes, 20, 25, 27 et 30°C. Le taux d’oviposition (nb d’oeufs/jour) augmente avec l’âge reproducteur de la coccinelle, atteignant un pic puis diminuant progressivement avant de cesser. La conversion de la biomasse des pucerons en oeufs est plus performante chez les jeunes adultes que chez les individus âgés. Le pic d’oviposition s’observe chez les jeunes femelles et le taux d’oviposition augmente avec la température entre 20 et 27°C La fécondité et le pourcentage d’oeufs viables sont maximum à 27°C avec 750 oeufs et 95% et minimum à 20°C avec 385 oeufs et 65%.

Mots Clés

coccinelle Micraspis discolor prédateur pucerons température évolution dé la fécondité 

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Copyright information

© ICIPE 2002

Authors and Affiliations

  1. 1.Department of ZoologyUniversity of LucknowLucknowIndia

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