Abstract
Abstract Papaya (Carica papaya L.) grown in Hawaii cannot be shipped to the mainland United States or to the markets in Japan without first being treated for possible fruit fly infestation. Currently, the so-called “double-dip” treatment (2) is being used for this purpose. This treatment consists of immersion of the fruit in 42°C water for 30 min, followed by a second immersion in 49° water for 20 min. Since this treatment is only effective in killing organisms near the surface of the fruit, it cannot be used on a fruit that has ripened to the point where insects may have penetrated deeply.
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