Effects of photoperiod and temperature on development and diapause induction in the Okayama population of Helicoverpa armigera (Hb.) (Lepidoptera: Noctuidae)

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

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    The effects of temperature and photoperiod on the development and diapause induction of Helicoverpa armigera (Hb.) were examined under laboratory conditions. The larvae reared at 20°C under short as well as long photoperiods entered diapause at different rates in the pupal stage, except at 17L:7D. The critical photoperiod for diapause induction was between 12L:12D and 13L:11D. Irrespective of photoperiod, the larvae reared at 15°C entered diapause, while those reared at 30°C did not. The developmental periods for eggs, larvae and pupae (non-diapausing) shortened with increasing temperature were 5.7 and 2.3, 29.0 and 10.6 days, and 25.9 and 9.2 days at 20°C and 30°C, respectively. The developmental threshold temperatures for the egg, larva and pupa were 10.8°C, 13.6°C and 14.6°C, respectively. Furthermore, the effective temperature sums for development were 45.5, 200.0 and 142.9 day-degrees (D°), respectively. The heat requirements indicate that the insect may complete a maximum of four generations per year in southern Okayama Prefecture, western Japan.

    Original languageEnglish
    Pages (from-to)327-331
    Number of pages5
    JournalApplied Entomology and Zoology
    Volume34
    Issue number3
    DOIs
    Publication statusPublished - Aug 1999

    Keywords

    • Critical photoperiod
    • Day-degrees
    • Helicoverpa armigera
    • Life cycle
    • Pupal diapause

    ASJC Scopus subject areas

    • Insect Science

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