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  • Title: Effects of extending the light phase on diapause induction in a Japanese population of the two-spotted spider mite, Tetranychus urticae.
    Author: Suzuki T, Amano H, Goto E, Takeda M, Kozai T.
    Journal: Exp Appl Acarol; 2007; 42(2):131-8. PubMed ID: 17549585.
    Abstract:
    Artificial lighting is a merit of a 'plant factory', which might be utilized to suppress an increase in pest population. We investigated the effects of extending the light phase on diapause induction in the two-spotted spider mite (TSSM), Tetranychus urticae. TSSM were reared at 18 degrees C under light phases ranging from 2 to 64 h combined with a constant dark phase of 16 h in aluminum bottles, with white light emitting diodes attached inside to minimize fluctuations in air temperature between the light and dark phases. Diapause was induced in adult TSSM females when the light phase was 24 h or shorter, and diapause induction was inhibited when the light phase extended over 32 h. The development of deutonymphs was delayed under a diapause-inducing photoperiod. Diapause inducing photoperiods may suppress an increase in the TSSM population, by slowing down development and reproduction.
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