Abstract
A field survey on the island of Kauai was done to determine the infestation rates of oriental fruit fly ( Dacus dorsalis Hendel) and melon fly ( D. cucurbitae Coquillett) in papaya ( Carica papaya L. ‘Sunrise’) based on varying levels of visual and “hot spot” colorimetric b indices of fruit ripeness. (The “hot spot” is the most yellow spot on the fruit’s skin surface.) The colorimetric b is a measure of yellowness obtained with the HunterLab LabScan Color Difference Meter. Melon fly never infested ‘Sunrise’ fruits at any stage of ripeness. In contrast, oriental fruit fly infested only one-quarter to fully ripe fruits. Mature green and color-break fruits, or those with values of b ≤ 18.4, were free of oriental fruit fly and melon fly infestations. Data suggest that two-stage hot-water immersion (double dip) treatment is still a viable quarantine treatment for ‘Sunrise’ papaya and that mature green and color-break fruits may be shipped to and marketed in the mainland United States without any treatment.
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