The impact of age at which mating occurs on the mating success, fecundity, fertility, and adult longevity of Ectropis obliqua Prout (Lepidoptera: Geometridae) was determined in laboratory testing. When newly emerged males were mated with females that emerged 1, 2, 3, 4, 5, or 6 d earlier, mating success, fecundity, and fertility generally decreased with increased age of the females. Similar responses were observed when newly emerged females were mated with males that had emerged 1, 2, 3, 4, 5, 6, or 7 d earlier and when females and males of the same age were allowed to mate. Adult longevity was inversely related to age at which mating occurred.
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