‘Northern Spy’ apples had a high incidence of core browning after a single 1-MCP treatment at 2 d postharvest; however, the addition of a second 1-MCP treatment after 4 months of CA dramatically reduced incidence of core browning (Table 4). ‘Northern Spy’ with multiple or a single 1-MCP treatment after 4 months of CA developed minimal core browning, which was comparable to ‘Northern Spy’ without 1-MCP.