Vol. 80 No: 6

Title:
Influence of 1-MCP application and concentration on post-harvest peel disorders and incidence of decay in citrus fruit

Authors:
H. DOU, S. JONES and M. RITENOUR

pp: 786-792

Abstract:
The effect of 1-methylcyclopropene (1-MCP) application and concentration on the incidence of post-harvest peel disorders and decay was evaluated in ´Fallglo` tangerines, ´Hamlin` and ´Valencia` oranges, and white ´Marsh` grapefruit during the 2000-2002 growing seasons. The disorders studied were chilling injury (CI), post-harvest pitting and stem-end rind breakdown (SERB). The major diseases investigated in this study were Diplodia stem-end rot (Diplodia natalensis), anthracnose (Colletotrichum gloeosporioides), and mould (Penicillium digitatum). Our studies confirmed that, in most cases, application of 1-MCP reduced CI and peel pitting in ´Fallglo` tangerine and grapefruit if applied at concentrations between 50-500 µg l<sup>-1</sup>, while concentrations higher than 1 mg l<sup>-1</sup> enhanced the development of decay in ´Fallglo` tangerine and white ´Marsh` grapefruit. In oranges, application of 1-MCP markedly reduced the incidence of SERB and increased the development of decay, if the 1-MCP concentration was high (1-5 mg l^-1). In parallel to the above results, fruit weight loss and colour development improved if 1-MCP had a positive effect in reducing the development of peel disorders. Overall, applying 1-MCP at concentrations from 50-500 µg l^-1 gave the best protection against CI and the development of post-harvest pitting.

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