The Canadian Entomologist
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Drosophila suzukii is a cosmopolitan polyphagous pest on unripe soft-skinned fruits. We sought to determine 1) temperature treatments that could be used to kill immature D. suzukii in fruit or packaging, and 2) whether development on different fruits led to differences in cold tolerance of immature D. suzukii. We reared animals from egg on a banana-based laboratory diet and diets made of apple, blueberry, cherry, grape, orange, raspberry, or strawberry homogenate in agar, and measured development time, adult body size, and cold tolerance. Diet type had complex effects on development time; in particular, flies reared on apple- or blueberry-based diets developed more slowly to a smaller adult body size than those on other diets. Cold exposure killed eggs and both first- and second-instar larvae. Survival of 24h at +4°C by feeding third-instar larvae was lowest in blueberry and cherry. Five days at +0.6°C killed all feeding third-instar larvae; this treatment is likely sufficient for targeting D. suzukii in fruit. Two hours at -5 or -6°C killed all wandering third-instar larvae and pupae; this exposure could be sufficient for sanitation of packaging.
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