Eur. J. Entomol. 93 (3): 519-523, 1996
Recurrent photoperiodic response in Graphosoma lineatum (Heteroptera: Pentatomidae)
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Photoperiodic response was studied in a pentatomid bug, Graphosoma lineatum (L.). When insects were reared from eggs under constant temperature of 26°C and long-day (18L : 6D) conditions, they developed into reproductive adults and started oviposition about 30 days after ecdysis. Short-day (12L : 12D) conditions and 26°C induced adult diapause. Both diapausing and reproductive adults displayed the photoperiodic response. Reproductive adults stopped oviposition about 10 days after the transfer to short-day conditions, and diapause adults started oviposition about 40 days after the transfer to long-day conditions.
Adults from the field were exposed either to short-day or long-day conditions. In late summer, adults that had already entered diapause responded to long-day photoperiod and started oviposition about 65 days after transfer. Thus, diapause induced under natural conditions appeared more intensive than the short-day ''laboratory'' diapause. Overwintered adults collected in spring started oviposition in both regimens about 7 days after the transfer. The absence of photoperiodic response indicated that diapause was over. However, under short-day photoperiod, females ceased oviposition about 11 days after its onset and re-entered diapause.
Czech population of G. lineatum has a facultative adult diapause induced by short-day photoperiod. The adults are sensitive to photoperiod before and in early hibernation and the completion of diapause is accompanied by a reversible loss of photoperiodic response. After a short period of oviposition the photoperiodic response is resumed. Thus, G. lineatum shows the recurrent photoperiodic response.
Keywords: Heteroptera, Graphosoma lineatum, adult diapause, recurrent photoperiodic response
Accepted: June 10, 1996; Published: September 30, 1996 Show citation
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