A flow-through vapor exposure system was developed to evaluate the effects of 2-nonanone vapor on the decay of apple slices inoculated with Penicillium expansum Link. and Botrytis cinerea Pers. Treatments with 2-nonanone at 130 to 300 µL (STP)/L of air at 23ЊC retarded growth of fungi on PDA. At 300 µL⅐L Ϫ1 , fungal growth was completely suppressed; however, it re-grew when transferred to air. At 5ЊC, exposure to 50 µL⅐L Ϫ1 suppressed, and at 100 µL⅐L Ϫ1 apparently killed, P. expansum on PDA and apple slices. For P. expansum at 5ЊC, only 25% of the 2-nonanone used at 23ЊC was needed. Physiological damage occurred on the peel of treated apples.
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