Preliminary evidence has suggested some benefits and drawbacks associated with more than one treatment of 1-MCP on apples. Research using ‘McIntosh’ and ‘Empire’ apples found that the application of early and consecutive 1-MCP treatments prior to CA storage had improved firmness retention and decreased storage-related disorders (Nock and Watkins, 2013). A similar study demonstrated multiple 1-MCP treatments within a week after harvest was the most effective at maintaining fruit quality and limiting disorders in ‘Cortland’ and ‘Delicious’ apples (Lu et al., 2013). Furthermore, ‘McIntosh’ and ‘Spartan’ apples subjected to consecutive 1-MCP (1 μL L−1) treatments or a single 1-MCP treatment at double the concentration (2 μL L−1) demonstrated risks associated with applications greater than the commercial standard; incidence of external CO2 injury and internal browning increased during long-term air or CA storage (DeEll and Ehsani-Moghaddam, 2013). For most apple cultivars, there continues to be no clear understanding of the optimal combination of 1-MCP treatment timing, conditions and number of applications to effectively maintain fruit firmness and limit the development of disorders during long-term storage.