Postharvest Decay Control of Apple by Acetaldehyde Vapor1

in Journal of the American Society for Horticultural Science
Glenn J. StadelbacherUniversity of Maryland, College Park

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Krishna PrasadUniversity of Maryland, College Park

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Decay of apples (Malus sylvestris Mill.) inoculated with Penicillium expansum was controlled by acetaldehyde vapor concentrations (v/v) of 0.5% for 180 min, 1% for 120 min, 2% for 60 min, and 3% for 30 min. The above treatments did not produce lenticel or skin injury. Fumigated conidia did not germinate in 21 days at 21°C on artificial media and failed to induce decay in stem-punctured apples. The pathogen could not be re-isolated from fumigated inoculated punctures, however, the pathogen was obtained from inoculated punctures not exposed to acetaldehyde vapor. Fungicidal action of acetaldehyde vapor was a function of concentration and exposure period. Objectional off-flavors were not detected in fumigated apples, although appreciable amounts of acetaldehyde vapor were absorbed.

Contributor Notes

Received for publication November 12, 1973. Scientific Article No. A1946; Contribution No. 4876, Maryland Agricultural Experiment Station.

Associate Professor and Research Associate, respectively, Department of Horticulture.

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