The larval stage can take from a few weeks to many months to complete, depending upon temperature and moisture of the bean. Pupation is within the bean. Circular holes are cut for the adult to emerge. All stages may be taken into storage from the field. Development and breeding goes on steadily as long as there is any food left in the bean and the temperature is sufficiently warm.
Infested seeds produce heat.
There may be many bean weevils per bean seed. Provide a clean, dry storage area. Keep the area clean. Store in lots in containers, and in places easy to inspect periodically for insect activity. Treat the seed.