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The ethylene action inhibitor 1-methylcyclopropene (MCP) reduces the rate of ripening of many apple and pear cultivars. The longevity of MCP responses induced by a single application at harvest is dependent in part on MCP treatment concentration and post-application storage conditions. Experiments were conducted using several apple and pear cultivars to evaluate the efficacy of repeated application to prolong the duration of MCP responses. Fruit were treated with MCP at harvest then stored in air at 0 °C. After various storage durations, MCP was reapplied at the same or higher concentrations. Control fruit not exposed to MCP were stored at the same temperature in either air or a controlled atmosphere (CA). Reapplication prolonged MCP responses compared to fruit treated only at harvest and fruit quality after storage was similar to that of fruit stored in CA. Reapplication was most effective when fruit ethylene production was below 0.1 μL·L –1  at the time of reapplication. The use of low concentration MCP treatments at harvest may allow for more predictable ripening of fruit after storage, particularly for pear fruit where softening is desired.

114 Multiple Applications Extend Duration of 1-Methylcyclopropene-induced Responses of Apple and Pear Fruit