Applied Entomology and Zoology
Online ISSN : 1347-605X
Print ISSN : 0003-6862
Regular Papers
Pupal diapause of Helicoverpa armigera: sensitive stage for photoperiodic induction
Anwar KurbanHideya YoshidaYohei IzumiShoji SonodaHisaaki Tsumuki
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Volume 40 (2005) Issue 3 Pages 457-460

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Abstract

Helicoverpa armigera exhibits a facultative pupal diapause, which depends on temperature and photoperiod. Pupal diapause is induced at 20°C by short photoperiods and inhibited by long photoperiods during the larval stage. Sensitive stages for photoperiodic induction of pupal diapause were determined by transferring larvae of various instars between long and short photoperiods. When larvae reared at 20°C under a short photoperiod during egg to fourth instar were transferred to a long photoperiod at the early fifth instar, diapause was not induced. However, when larvae were transferred to a long photoperiod in the middle of fifth instar, diapause was induced. On the other hand, when larvae reared under a long photoperiod during egg to fourth instar were transferred to a short photoperiod at the early fifth instar, about 80 to 100% pupae entered diapause. These results show that the early fifth larval instar is the main sensitive stage for pupal diapause determination even though photoperiod has some effect in the third and fourth instars.

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© 2005 by the Japanese Society of Applied Entomology and Zoology
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