抄録
The oak platypodid beetle, Platypus quercivorus (Murayama) (Coleoptera: Platypodidae), could be reared under a 16L : 8D light regime at 25°C on logs of the deciduous oak tree, Quercus serrata Thunb. ex Murray, which had been immersed in water for 10–14 days at 23–25°C. Adult males bored holes into the water-soaked logs, but not on unsoaked logs when they were both provided together. Male adults were released in plastic boxes containing soaked log(s) and allowed to bore holes into the logs 4 days before introducing female adults. Thirty days after introducing the females, about 70% of the individuals in the galleries were in the egg stage. Thirty days later, about 70% of the individuals were 5th stage larvae. About 0.7–3.9 times as many new adults emerged as released from each log. The number of emerging adults per emerging gallery for each log ranged from 18.5±1.5 to 36.0±7.5 (mean±SE). The reproductive performance of the borer reared on a small diameter log was lower than that of the borer reared on a large diameter log. The 50% cumulative adult emergence day ranged from 92 days to 127 days after the females were introduced to the galleries.
