The rice weevil (Sitophilus oryzae L.) is a very destructive pest common in stored grains because of its polyphagous behaviour. For the effective management of the insect, its biology should be understood. So, the present study aimed to evaluate the biology of rice weevil was studied on stored rice variety “Lajawab” under laboratory conditions during 2023-2024. The weevil completed its life cycle in four distinct stages viz., egg, larva, pupa and adult. Female rice weevils laid eggs in rice grains, which hatched in 5-6 days. Larvae moult three times over 19-22 days, and the pupal stage lasted 9-11 days. Adults lived 60-82 days. The complete life cycle average 107 days under controlled lab conditions of temperature 27±1˚C and relative humidity of 70±5 percentage. The duration of different stages of the life cycle of the weevil may be useful in managing the rice weevil effectively

Rice, Rice weevil, Biology, Morphometry

The developmental biology of Sitophilus oryzae, a significant pest of stored rice, was studied by closely examining its various life stages. The life cycle of S. oryzae consisted of four stages, starting with the egg, followed by four distinct larval instars (1st, 2nd, 3rd, and 4th), pupal stage and the adult. Each larval stage involved feeding on the inner grain content, leading to gradual development and eventual pupation. The pupal stage marks the transition from the larval phase to the emergence of the adult weevil, which then actively participates in reproduction and infestation of stored grains. The time required for S. oryzae to complete its full life cycle typically ranged between 93 and 121 days

Tabika Chaudhary, M. Raghuraman, R.S. Meena, Vinita Sharma and Puneet Kumar (2025). Biology of Sitophilus oryzae (L.) on Stored Rice. Biological Forum, 17(4): 33-36