Comparison of the seasonal activities of field-collected Haemaphysalis flava nymphs (Acari: Ixodidae) : The alternation of the new and old generations under experimental outdoor conditions

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  • 野外採集されたキチマダニ若虫の季節消長の比較 : 屋外の実験条件下での新旧の世代交代

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Abstract

In order to clarify the seasons of the alternation of the new and old generations, the seasonal activities of Haemaphysalis flava nymphs, which were collected monthly from the field, were observed in plastic cylinders placed outdoors. The activities of the field-collected nymphs in May 2004, March and April 2005 were high until June after they were introduced into the plastic cylinders. However, the activities decreased in July and were scarcely observed in August. The activity of the field-collected nymphs in June 2004 was observed until December after introduction, but there were few active nymphs. The activities of the field-collected nymphs in July and August were high until October or November after introduction. Furthermore, active nymphs were observed even in the following spring, although these were few. The activity of the field-collected nymphs in September was similar to those of the nymphs in July and August. The activities of the field-collected nymphs in October and November were high until the following spring (May) after introduction, although the nymphs temporarily decreased their activity in January. The activities of the field-collected nymphs in December, January, and February were similar to those of the nymphs in the autumn (October and November). These results suggest that the participation of the new generation of H. flava nymphs occurs in two seasons; summer and autumn. The new generations in summer and autumn probably begin to climb floor vegetation in June and October, respectively, and all die in June and August/September of the next year.

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