Ovarian development, fecundity and sex ratio of Trissolcus plautiae (WATANABE) (Hymenoptera:Scelionidae), an egg parasitoid of the brown-winged green bug, Plautia stali SCOTT.

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  • OHNO Kazuro
    Institute of Biological Control, Faculty of Agriculture, Kyushu University

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  • チャバネアオカメムシの卵寄生蜂チャバネクロタマゴバチの卵巣発育，蔵卵数と性比
  • チャバネアオカメムシ ノ ランキセイバチ チャバネクロタマゴバチ ノ ランソウ

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Trissolcus plautiae is a solitary and dominant parasitoid of the brown-winged green bug, Plautia stali which lays 14 eggs in compact masses. Laboratory studies were carried out to investigate the ovarian development, fecundity and sex allocation. T. plautiae was found to be a synovigenic species, that is, newly emerged females had only a few mature eggs in their ovaries, produced 14.8 mature eggs on the average after one day and a full complement was reached after 4 days. During first several days females laid nearly 14 eggs daily even when large host egg masses artificially constructed were provided to the wasps. However, in such a case, the mortality of the progeny in hosts was high. It was concluded that the primary sex ratio was 0.07 and the sex allocation into a host egg mass of 14 eggs was one male and 13 females. Based on the sex allocation data and net reproductive rate, T. plautiae appears to be able to parasitize 8-9 host egg masses consisting of 14 eggs throughout the life time. The present results suggest that the ovarian development and oviposition rate of T. plautiae are closely related to the typical size of a host egg mass.

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