日本ダニ学会誌
Online ISSN : 1880-2273
Print ISSN : 0918-1067
ISSN-L : 0918-1067
12 巻, 1 号
選択された号の論文の5件中1~5を表示しています
総説
  • 高藤 晃雄, 森下 正彦
    2003 年 12 巻 1 号 p. 1-10
    発行日: 2003年
    公開日: 2005/08/15
    ジャーナル フリー
    Tetranychus urticae long a cosmopolitan, and T. kanzawai originally limited to the Far East now occurs widely on a variety of horticultural crops in Japan. The latter also depends on wild host plants and there are frequent exchanges of individuals between crops and wild hosts. The two species have many host plants in common and show similar ecological performance. However, the host adaptability of T. kanzawai often differs among mite strains, forming host races, but not in T. urticae. In warmer areas of Japan, the distribution of T. urticae in the field is limited and the mites maintain their populations only if adequate hosts are available in both summer and winter. The incidence of diapause of T. urticae shows a latitudinal cline and in warmer areas the mites have very weak diapause. By contrast, populations in warmer areas, such as Kagoshima and Taiwan, of T. kanzawai show a high incidence of diapause. We then speculated the origin of the two spider mite species.
原著
短報
  • 豊島 真吾, 日本 典秀
    2003 年 12 巻 1 号 p. 33-37
    発行日: 2003年
    公開日: 2005/08/15
    ジャーナル フリー
    Amblyseius womersleyi is a native phytoseiid mite in Japan, and one of the promising natural enemies to control spider mites. A. womersleyi populations were collected from various region of Japan, and reproductive characteristics of the populations were compared to detect the intra-specific variation as a first step to establish high reproductive strains. Although the number of eggs produced by females copulated once did not vary among populations, the total number of eggs produced by females with supplementary copulation and the number of eggs produced daily by females copulated once and with supplementary copulation were significantly different. The mortality during immature development, the sex ratio in offspring when emerged and the prey consumption rate by gravid females also showed significant differences. The daily egg production was correlated with the total egg production, and highly correlated with the prey consumption rate. Consequently, A. womersleyi showed intra-specific variation of reproductive characteristics.
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