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Studies on biology of eri silkworm, Samia ricini (Donovan) on castor, Ricinus communis under laboratory condition revealed that the eggs were laid in clusters on kharika. A female laid average 360.10±23.88 eggs with 97.17±2.09 per cent hatching and 8.83±0.91 days of incubation period. The duration of first, second, third, fourth and fifth instar larva were 3.77±0.43, 3.23±0.43, 3.70±0.47, 4.60±0.50 and 7.67±0.55 days, respectively with total larval duration of 22.97±0.85 days. The prepupal and pupal periods were2.63±0.49 and 15.73±0.74 days, respectively. The pre-oviposition, oviposition and post-oviposition period were 11.61±0.37, 70.47±1.78 and 122.73±4.81hrs, respectively. The female and male longevity were 204.82±5.24and155.99±7.99hrs, respectively with sex ratio of 1:2.01 (Male: Female). |
