ナシを加害する鳥取産ナミハダニとカンザワハダニの休眠誘起条件と休眠雌出現時期並びに越冬離脱時期

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  • Appearance Time of Diapausing Females and Termination of Diapause in the Two-spotted Spider Mite, <i>Tetranychus urticae</i> KOCH and the Kanzawa Spider Mite, <i>Tetranychus kanzawai</i> KISHIDA on Pear Tree in Tottori District (Acarina: Tetranychidae)
  • ナシ オ カガイスル トットリサン ナミハダニ ト カンザワハダニ ノ キュウ

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The appearance of diapausing females of two mite species (Tetranychus urticae KOCH and T. kanzawai KISHIDA) was observed at the critical photoperiod of about 12 hours at the intermediate temperature of 16°C, and about 50% diapausing females appeared in early October in Tottori District. The diapausing females of T. urticae overwintered in groups under the roughened bark and those of T. kanzawai overwintered under fallen leaves and tight rope knots of lateral shoot. It was found that there was a high correlation between the number of summer females on leaves in late September and the amount of overwintering females. Diapause was broken in about 70% of the females of T. kanzawai collected from pear orchard on November 15, by chilling at about 4°C for 29 days, and in about 50% of the females of T. urticae the diapause was broken by exposure to a temperature of about 4°C for 41 days. But it was observed that in about 60-90% of females of the two species diapause ended in late December in the field. The number of detached females from overwintering areas increased linearly from late February to early March. This phenomenon was completed in late March in T. kanzawai, whereas in T. urticae it extended up to mid-April.

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