Figure 10. Typically, growers will try to select healthy fruiting spurs about every 5–6 inches along the cordon. The individual spurs are pruned to 4–7 inches. If spurs exceed 7 inches, they are technically called canes. On a 4-inch spur you will find two to three buds.
Illustration shows thicker, older wood, and 4 inch fruiting spur (1 year wood)