岡山県南部に発生するミカンハダニ個体群の休眠性と寄主選択性の比較

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  • Comparison of Diapause Attributes and Host Preference among Three Populations of the Citrus Red Mite, <i>Panonychus citri</i> (MCGREGOR) Occurring in the Southern Part of Okayama Prefecture, Japan
  • オカヤマケン ナンブ ニ ハッセイスル ミカンハダニ コタイグン ノ キュウミ

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Diapause, reproductive capacity and host preference were compared among the three populations of Panonychus citri occurring in the southern part of Okayama Prefecture. Two of the populations (Sairyuji and Momoezuki) originated from pear orchards and the other (Ushimado) from citrus. Of the two pear populations, the Sairyuji population laid only summer eggs, whereas the majority of the eggs oviposited by the Momoezuki population were winter eggs, when the entire immature stages were exposed to a 15°C: 8L regime. Under the same conditions, the citrus population oviposited only summer eggs. The intrinsic rate of increase of each of the nondiapausing populations (Sairyuji and Ushimado) was much higher, compared to that of the diapausing population (Momoezuki), and the rates of the nondiapausing populations were higher on pear than on citrus. On citrus the diapausing population did not develop at all into the adult stage, but the non-diapausing populations did develop both on citrus and pear. All the three populations including the citrus population strongly preferred pear to citrus. These facts indicate that the Sairyuji population from pear was quite similar to the citrus population with regard to diapause incidence and host preference.

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