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Biology of sitophilus oryzae (L.) (Coleoptera: Curculionidae) on stored rice grains during different seasons in Terai agro-ecology of west Bengal

Laboratory experiments were carried out to study the biology of Sitophilus oryzae on stored rice grains in different seasons during 2016-17. The results of the laboratory experiments revealed that the duration of various developmental stages i.e. incubation period, larval period, pupal period and adult longevity varied from one season to another season. The longest incubation period, larval period and pupal period of 5.85±0.31, 21.33±0.99 and 10.20±0.50 days was registered during February. And the longest adult longevity of male with food of 58.72±3.44 days and without food of 12.98±0.98 days and adult longevity of female with food of 77.23±3.11days and without food of 14.47±0.69 days were also recorded during February. Total life cycle of male with food (96.09±3.81), without food (50.35±1.85) and total life cycle of female with food (114.61±2.98), without food (51.84±1.56) were also longest during February when the temperature and relative humidity ranges from 12.39°C to 27.89°C and 58.33 to 88.81% R.H. respectively. The longevity of adult female was always higher than the males irrespective of season and food. | Biology of sitophilus oryzae (L.) (Coleoptera: Curculionidae) on stored rice grains during different seasons in Terai agro-ecology of west Bengal