キボシカミキリの発生に関する生態学的研究

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タイトル別名
  • Ecological Study on the Occurrence of the Yellow-spotted Longicorn Beetle, <i>Psacothea hilaris</i> PASCOE.
  • キボシカミキリ ノ ハッセイ ニ カンスル セイタイガクテキ ケンキュウ 2
  • II. The Effect of Photoperiod on Larval and Pupal Development
  • II. 幼虫の蛹化におよぼす日長条件

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The effect of photoperiod on larval growth in Psacothea hilaris was investigated with newly hatched larvae derived from adults collected at Tsukui (Kanagawa), Ayabe (Kyoto), and Ozu (Ehime). The larvae from the three localities took more than 200 days to pupate and the pupal stage lasted less than 30 days in photoperiods of less than 13 hours at 25°C. Only one generation was therefore possible under these conditions. In photoperiods of more than 14 hours at 25°C, the larvae pupated within 100 to 150 days and adults emerged in less than 20 days later. Thus, two generations might be repeated in these cases. From these results, the critical photoperiod seemed to be between 13 to 14 hours. When the larvae that had been kept in short days for 6 months were transferred to long day conditions, all of them gave rise to adults within a month after the transfer. This suggests that the change in photoperiod exerts an inportant influence on the larval development.

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