The hind wings functions as flight wings. The 5 mm long adults perforate the grain to lay one egg. Each female may lay from 300 to 400 eggs that hatch 5-15 days later.
The time from egg to adult is only 35 to 40 days; the larva and pupa remain inside the kernel. The adult chews out of the kernel, leaving behind the characteristics weevil damage.
Sitophilus oryzae L