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MEK/ERK signalling has been identified as a key factor that terminates diapause in Sarcophaga crassipalpis and Bombyx mori. Paradoxically, high p‐MEK/p‐ERK signalling induces diapause in pupae of the moth Helicoverpa armigera; however, the regulatory mechanism is unknown. In the present study, we show that p‐MEK and p‐ERK are elevated in the brain of diapause‐destined pupae and suppression of MEK/ERK...