Proteinaceous food baits in water traps were 20X more efficient in trapping oriental fruit flies, Dacus dorsalis Hendel, in a dry climate (less than 25 cm avg annual rainfall) than in a wet climate (400 cm). Greater efficiency also was observed in a dry climate with the melon fly, D. cucurbitae Coquillett, and the Mediterranean fruit fly, Ceratitis capitata (Wiedemann).
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Cunningham et al. (1978) studied this question.