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Survival curves of Pieris brassicae butterflies (males and females combined) that had been reared in Petri dishes on leaf discs treated with fipronil (0–32 µg kg−1 DM). Survival curves with the same letter are not significantly different (Kaplan–Meier log-rank test, α = 0.0023). Open circles denote censored individuals. (Online version in colour.)
