Mating Behaviour of the Rice Stem Borer Moth, Chilosuppressalis WALKER : Lepidoptera : Pyralidae : VI. Effects of Photoperiod on the Diel Rhythms of Mating Behaviours

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Diel activity rhythms of mating behaviours in the rice stem borer moth, Chilo suppressalis WALKER, were studied under various conditions of light-dark cycles at 25℃ and 15℃. The mating time shifted later with a shortening of the photoperiod. The distribution of mating time in the scotophase was spread more widely under a short photoperiod than under a longer one. The mating time at 25℃ shifted more with varying photoperiods than it did at 15℃. The mean calling time also shifted later with a shortening of the photoperiod, as well as that in mating. The degree of the calling shift at 25℃ was larger than that at 15℃. The periodicity of male sexual response to the female sex pheromone extracts in 8L-16D also shifted later than that in 16L-8D.
1981-11-25