Biology of Chrysoperla carnea (Stephens) on Corcyra cephalonica (Stainton) at different temperature levels

Studies on biology of Chrysoperla carnea on Corcyra cephalonica indicated that the incubation period of C. carnea was significantly minimum to the extent of 2.96 days at 30°C followed by 25°C (4.0 days) and 20°C (06.26 days). The significantly maximum egg hatching (98.00 per cent) of C. carnea was observed at 25°C followed by 20°C (93.94 per cent) and 30°C (85.00 per cent). The growth index and the larval duration of C. carnea were 4.43, 8.87 and 13.43 and 20.93, 10.81 and 6.96 days at 20, 25 and 30°C, respectively. The significantly lowest pupal duration of 4.25 days was observed at 30°C temperature followed by 6.76 days at 25°C and 19.95 days at 20°C. Significantly the shortest life-cycle duration of 33.28 and 32.07 days by female and male of C. carnea was observed at 30°C. The pre-oviposition period (5.83 days) was lowest at 30°C while oviposition period (22.20 days) of C. carnea was highest at 25°C.