Populational variation in diapause-induction and -termination of Helicoverpa armigem (Lepidoptera: Noctuidae)

Mohammed Hanif Qureshi, Tamotsu Murai, Hideya Yoshida, Hisaaki Tsumuki

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    Diapause induction and termination were compared among three different geographic populations of Helicoverpa armigera from Ishigaki (24.3° N; 124.2° E), Okayama (Ushimado, 34.6° N; 134.1° E) and Kanazawa (36.6° N; 136.7° E) in Japan. The critical daylength for pupal diapause induction among the three populations was between 12L:12D and 14L:10D in the larval stage. No clinal latitudinal variation in the critical daylength was found among the three populations. Most of the diapausing pupae emerged when they were continuously maintained at 20°C under 12L:-12D, suggesting that cold exposure (chilling) is not necessary to break the pupal diapause. Furthermore, the time required for diapause termination of the Okayama population was the longest (214 days), followed by the Ishigaki (149 days) and Kanazawa (73 days) populations at 20°C (without chilling) under the 12L:12D photoperiod. These results showed no clinal latitudinal variation in diapause termination.

    Original languageEnglish
    Pages (from-to)357-360
    Number of pages4
    JournalApplied Entomology and Zoology
    Volume35
    Issue number3
    DOIs
    Publication statusPublished - Aug 2000

    Keywords

    • Clinal variation
    • Diapause termination
    • Helicoverpa armigera
    • Photoperiodic response
    • Populational variation

    ASJC Scopus subject areas

    • Insect Science

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