抄録
Photoperiodic response of larval development in the yellow-spotted longicorn beetle, Psacothea hilaris (PASCOE), was examined at 20 and 30°C using six geographic populations collected in Japan (Akita, Oyama, Ayabe, Ino, Naze and Ishigaki). The results were compared with the responses at 25°C. By contrast, photoperiodic response at 20°C was largely different from that at higher temperatures. In the Ayabe and Ino populations, which showed clear long-day responses at higher temperatures, supernumerary molting (a characteristic of larval diapause in this species) was induced under both 12L: 12D and 15L:9D. Larvae of the Naze population also showed less clear long-day photoperiodic response. Most noticeably, larvae of the Akita, Oyama and Ishigaki populations, which did not show clear photoperiodic response at higher temperatures, expressed typical long-day responses at 20°C.
