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By Arshad Ali and Parvez Qamar Rizvi


Abstract: The data on age and stage specific life-table of C. septempunctata at varying temperature revealed that it took maximum period (68 days) to complete generation at 20±1°C followed by (61 days) at 24±1°C and (53 days) at 28±1°C. The survivorship and mortality curve showed an irregular pattern with sharp high peaks and negative low peaks. The expectancy of life exhibited a continuous decline with advancement of age. As far as stage specific life table concerned, the developmental stages of C. septempunctata showed highest survivor fraction and lowest apparent mortality, mortality survival ratio, indispensable mortality and k-values at low temperature as compared to high. On the other hand, minimum total generation mortality (K) was recorded (0.1079) at 24±1°C followed by (0.2076) 20±1°C and (0.2676) 28±1°C. The study revealed that among three different constant temperatures, 24±1 °C has been proved as a most suitable for the life cycle of C. septempunctata

Year: 2014
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