How Do You Tell If a Silkworm Is Male or Female?

Short of scientific procedures, such as X-ray imaging, it is impossible to determine silkworm gender in the larva or pupa stage. In the adult moth stage, females can be distinguished from the males because of their larger size.

Male silkworms produce more silk in their cocoons and a higher quality silk than females. In the silk business, gender is therefore an important factor in farming silkworms.