Retainability and egg laying of Chrysoperla carnea adults were observed over a period of 5 weeks under cotton ecosystem. Using weather factors, correlations and multiple regression analysis were worked out to identify the factors influencing the retainability and egg laying. Multiple- correlation studies revealed that a significant positive association exist between the retainability and egg laying of the adults C. carnea under maximum relative humidity with aphid population and significant negative association was also observed with maximum temperature and wind speed. Hence, multiple regression analysis led to the conclusion that a decrease in maximum temperature increases the per cent retainability of C. carneu adults.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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