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In order to clarify whether or not engorged Amblyomma testudinarium Koch nymphs exhibit morphogenetic diapause, their development was observed at 25°C under four photoperiodic conditions (10L-14D, 11L-13D, 12L-12D, and 16L8D), The molting of the engorged nymphs was little affected by the exposure to 12L12D and 16L-8D photoperiods. However, the molting was retarded or arrested by the exposure to 1OL-14D and 1 1L-13D photoperiods. These results suggest that engorged A, testudinarium nymphs enter rnorphogenetic diapause under short-day photoperiods. Judging from the percentage of molting, their critical photoperiod for the induction of diapause appeared to be close to 11 hr. Thus, a part of the A. testudinarium nymphs that are active in autumn enter morphogenetic diapause and hibernate in the engorged state,

Morphogenetic diapause of engorged Amblyomma testudinarium Koch nymphs (Acari : Ixodidae) induced by short-day photoperiods