The difference between stock and scion are:
Stock
- A rooted stem into which a scion or a bud is grafted is called a stock.
-
Image Source: naaic.org/TAG/TAGpapers/arcioni/fig8.jpg
Stock is selected for its adaptability, resistance to diseases etc.
Scion
- A piece of young stem or bud which is inserted into a root stock is called scion.
- Scion is selected for good quality of fruits, flowers, resistance to diseases etc.