title: Effect of photoperiod on immature development and diapause induction in the Kanzawa spider mite, Tetranychus kanzawai (Acari: Tetranychidae).
abstract: The diapause response of the Kanzawa spider mite (KSM), Tetranychus kanzawai, was examined. KSMs were reared in aluminum bottles at 18°C with different combinations of light and dark periods created by the light-control unit. The developmental periods for all immature stages tended to decrease as the light period increased. The photoperiodic response curve for diapause induction showed that the critical (=50% diapause) light period was around 13 h days(-1). No diapause induction was observed when the light period was longer than 13.5 h days(-1) or under continuous light. At 13-h days(-1) light period, the developmental period for deutonymphal stage as well as for the total immature stages was longer in diapaused females than in non-diapaused females. These results indicate that immature development as well as diapause induction are affected by photoperiod and further suggest that diapause-inducing stimuli prolong the developmental period especially for the deutonymphal stage of KSMs.
authors.affiliation: Graduate School of Horticulture, Chiba University, Matsudo 648, Matsudo, Chiba 271-8510, Japan. entomologist13@yahoo.com
authors.forename: Maqsood
authors.initials: M
authors.lastname: Shah
authors.forename: Takeshi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Noureldin Abuelfadl
authors.initials: NA
authors.lastname: Ghazy
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Amano
authors.forename: Katsumi
authors.initials: K
authors.lastname: Ohyama
mesh_terms: D000818:Animals; D005260:Female; D007814:Larva / Q000254:growth & development; D009758:Nymph / Q000254:growth & development; D017440:Photoperiod; D040102:Tetranychidae / Q000254:growth & development*