Effect of Postharvest Storage Conditions on Occurrence of Alternaria Rot on Okra Pods

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  • 収穫後の保管条件がオクラ果実黒斑病の発生に及ぼす影響

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We examined the relationship between postharvest storage conditions of okra pods and the occurrence of Alternaria alternata on these pods. Occurrence of Alternaria rot on pods was frequent when pods were stored at 100% relative humidity (RH), and was repressed when they were stored at 50-90% RH (average 86% RH). In addition, we observed that dew condensation on okra pods stimulated occurrence of Alternaria rot. In our transportation test to Tokyo (conducted in September) occurrence of Alternaria rot was frequent at 10 deg C during the period between packing and the following day; however it was repressed at room temperature (18.3-27.0 deg C) over the same time period. Okra pod losses had a tendency to be repressed as storage temperature decreased. We thus indicate desirable conditions for repressing Alternaria rot on okra pods during the distribution process: okra pods should be stored at 50-90% RH (average 86% RH), and at a temperature above the dew point and as low as possible in order to avoid dew condensation caused by rapid changes in temperature.

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