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Age-stage-specific life expectancy (exj) of Spodoptera frugiperda reared on six different maize varieties. L1–L6 represent 1st–6th instar larvae, respectively. The exj on Baitiannuo (A), Ziyunuo (B), Zaocuiwang (C), Wuke 113 (D), Wuke No. 4 (E) and Zhengdan 958 (F).
