冬季タマネギにおけるネギアザミウマ（アザミウマ目：アザミウマ科）の発生動態 (Japanese)

Occurrence of the onion thrips, Thrips tabaci Lindeman, was examined from late December to late May at onion fields with three different cropping types, early, middle, and late seasons, in Kagawa Prefecture, western Japan. In the early season onions, survival of adults, larvae and newly hatched larvae of T. tabaci was observed on onion plants during winter and their occurrence was increased from April. In the middle season onions, T. tabaci of all developmental stages were found from late April. In the late season onions, newly hatched larvae increased from early March in the field where T. tabaci adults had occurred. On the other hand, no such increase of newly hatched larvae was observed in the field where fewer adults had existed. Oviposition of adults on onion seedlings was also examined in the laboratory and field conditions in March. The newly hatched larvae from onion seedlings were found at 10°C and 20°C in the laboratory and in the field. [ABSTRACT FROM AUTHOR]

香川県の冬季タマネギにおけるネギアザミウマの発生状 況を，早生，中生および晩生の3 つの異なる作型で12 月 下旬から4 月中旬まで調査した．早生タマネギでは，冬季 にタマネギに生息するネギアザミウマ成虫，幼虫およびタ マネギ葉からの孵化幼虫が確認され，4 月下旬から増加し た．中生タマネギでは，成幼虫および孵化幼虫ともに4 月 下旬から確認された．晩生タマネギでは，調査開始時から 成虫が認められた圃場では，3 月上旬から孵化幼虫が増加 したのに対して，成虫がほとんど認められなかった別の圃 場では，孵化幼虫は増加しなかった．室内および3 月上旬の野外におけるタマネギ苗へのネギアザミウマの産卵で は，10°C, 20°C および野外に置いたタマネギ苗から孵化幼 虫が観察された． [ABSTRACT FROM AUTHOR]

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