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The Role of Juvenile Hormone in Diapause and Phase Variation in Some Lepidopterous Insects

Abstract

It is well known that various insects respond to environmental stimuli by entering diapause or exhibiting phase variation. In lepidopterous insects, for example, mature larval diapause of both the rice stem borer, Chilo suppressalis and European corn borer, Ostrinia nubilalis is mainly induced by a short day photoperiod (SD), while under a long day photoperiod (LD) almost all larvae fail to enter diapause (Inouye and Kamano, 1957; Beck, 1962). Similar photoperiodic responses were observed in the cabbage armyworm, Mamestra brassicae. In this insect, pupal diapause was mainly induced by SD conditions during the larval period (Matsumoto et al., 1953). On the other hand, it was shown in both the common armyworm, Leucania separata and the tobacco cutworm, Spodoptera litura that larval characters are varied with the density of population (Iwao, 1962).

Keywords

Phase Variation Juvenile Hormone Larval Period Juvenile Hormone Analog Juvenile Hormone Titer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1976

Authors and Affiliations

  • S. Yagi
    • 1
  1. 1.Laboratory of Applied Zoology, Faculty of AgricultureTokyo University of EducationKomaba, Meguro-ku Tokyo 153Japan

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