The average duration of first, second, third and fourth instar larvae of C. septempunctata var divaricata was observed to be 3.56 and 3.66, 2.60 and 2.38, 2.48 and 2.49 and 4.35 and 3.86 days during February and March, respectively. The survival rate of larvae varied between 86.25 and 99.50 per cent in different instars during February and March, respectively. The mean pupal period was 41.16 and 3.46 days with survival rate of 97.14 and 90.97 per cent during February and March, respectively. The average duration of adult longevity was higher in February than March. The survival rate of adult up to 15th day of emergence was higher in March. The adult mortality was recorded to be more after 20, 25, 30 and 35 days of emergence.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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