Abstract
Mating behavior of Spodoptera exigua was observed under both laboratory and field conditions. In the laboratory (25°C, 14L-10D), mating started 5-7hr after lightoff and continued for 40-55min while in the field (average night temperature 26.2°C, sunset 18:23, sunrise 5:46 on Sept. 10, 1987), it began 5.5-8.5hr after sunset. Mating time advanced with age in both sexes. Duration of mating tended to decrease in the pairs mated late in the night. Some of the tethered females (7%) copulated twice with different males during one night.
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