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Age-stage-specific survival rate (Sxj) of Spodoptera frugiperda reared on six different maize varieties. L1–L6 are the larval instars from first to sixth. The Sxj on Baitiannuo (A), Ziyunuo (B), Zaocuiwang (C), Wuke 113 (D), Wuke No. 4 (E) and Zhengdan 958 (F).
