Critical daylength for diapause induction and properties of non-ovipositing females in the diapausing strain of the citrus red mite, Panonychus citri(McGregor). (Acarina: Tetranychidae).

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Critical daylength for diapause induction was studied in five diapausing populations of the citrus red mite, Panonychus citri (MCGREGOR) from intermediate latitudes in Japan, and the effect of oviposition site was also examined on egg deposition by females reared under short-days. In all populations, females laid only non-diapausing eggs when they were reared at 20°C : 14L-10D and/or 16L-8D throughout their immature stages, whereas only diapausing eggs at 20°C : 12L-12D and/or 11L-13D. Under 13L-11D, the females laid eggs of both types. Under a daylength shourter than 13 hr, oviposition was severely curtailed on pear leaf discs and many females did not lay any eggs. These non-ovipositing females were shown to be diapause-induced, because they developed mature ova in their ovaries and oviposited normally diapausing eggs on a pear twing with a leaf. The combined results showed that the critical daylength for all 5 populations was about 13 hr.
日本応用動物昆虫学会の論文