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

概要

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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℃ 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℃ entered diapause, while those reared at 30℃ 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℃ and 30℃, respectively. The developmental threshold temperatures for the egg, larva and pupa were 10.8℃, 13.6℃ and 14.6℃, respectively. Furthermore, the effective temperature sums for development were 45.5, 200.0 and 142.9 day-degress (D°), respectively. The heat requirements indicate that the insect may complete a maximum of four generations per year in southern Okayama Prefecture, western Japan.
日本応用動物昆虫学会の論文
1999-08-25