Kyushu Plant Protection Research
Online ISSN : 1884-0035
Print ISSN : 0385-6410
ISSN-L : 0385-6410
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Volume 66
Displaying 1-14 of 14 articles from this issue
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  • Practical use of inoculative release of the predatory mite, Amblyseius swirskii Athias-Henriot, against thrips on broad bean in open fields
    ─ Evaluation in commercial farmer fields ─
    Kazuki Kakimoto, Syotarou Nyuuta, Akihiro Minami
    Article type: research-article
    2020 Volume 66 Pages 40-47
    Published: November 28, 2020
    Released on J-STAGE: February 22, 2023
    DOIhttps://doi.org/10.4241/kyubyochu.66.40
    JOURNAL FREE ACCESS
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    The practical effect of the inoculative release of the predatory mite Amblyseius swirskii Athias-Henriot against thrips on broad bean was evaluated in commercial farmer fields. Experiments were conducted at six different fields from October to December in 2019 in Ibusuki City, Kagoshima, Japan. The dominant species of thrips was Thrips hawaiiensis（Morgan）. The population densities of thrips when A. swirskii was released were significantly lower throughout experiment and decreased by approximately 35% on average compared to the control （non-treatment） trials in the five fields. However, the predatory mites were not effective in one field. Differences in the densities of predatory mites on broad bean might affect the efficacy. Further research is required to improve the efficacy and success of biological control for broad bean.
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  • Effect of the pest management difference against the sweet potato whitefly, Bemisia tabaci （Gennadius）, and melon thrips, Thrips palmi Karny, on mixed cultivation of kidney bean and bitter gourd in a greenhouse.
    Kazuki Kakimoto, Nozomi Maenosono, Yuuki Ikenoue, Naoyuki Horita, Naoy ...
    Article type: research-article
    2020 Volume 66 Pages 48-56
    Published: November 28, 2020
    Released on J-STAGE: February 22, 2023
    DOIhttps://doi.org/10.4241/kyubyochu.66.48
    JOURNAL FREE ACCESS
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    Recently, kidney bean and bitter gourd have been grown under mixed culture in the same protected greenhouse in Kagoshima, Japan. Farmers first cultivate kidney bean from October, and then bitter gourd is cultivated continuously from January. Whiteflies, thrips, spider mites, and leafminers are known to be important pests of kidney bean; however pests on bitter gourd cultivated in a greenhouse have not previously been investigated. Through a survey of 14 commercial fields and additional experiments at a research center, we discovered that the sweet potato whitefly, Bemisia tabaci （Gennadius）, and melon thrips, Thrips palmi Karny, were serious pests on both crops. Furthermore, our survey of the commercial fields indicated that the densities of these two pests on bitter gourd were lower in fields in which biological control agents, including Amblyseius swirskii Athias-Henriot or Amblydromalus limonicus （German & McGregor）, were released on kidney bean, than in fields in which only chemical insecticides were used. Our additional experiments at the research center also showed that biological control using A. swirskii was more effective than chemical control against whiteflies and thrips on both crops
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  • Effects of spraying spinosad on Phytoseiulus persimilis Athias-Henriot (Acari: Phytoseiidae) infested greenhouse roses
    Kanako Uemura, Sachiko Matsumoto, Nobutaka Shimizu
    Article type: research-article
    2020 Volume 66 Pages 57-65
    Published: November 28, 2020
    Released on J-STAGE: February 22, 2023
    DOIhttps://doi.org/10.4241/kyubyochu.66.57
    JOURNAL FREE ACCESS
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    The effects of applying spinosad to Phytoseiulus persimilis Athias-Henriot on roses were evaluated by laboratory and field tests. In the laboratory tests, spinosad wettable powder (diluted 5,000 times) was applied with two different methods for P. persimilis: dipping rose leaves in the spinosad solution (dipping treatment) or spray application to the mites on roses (spraying treatment). Mortalities of P. persimilis after 72 h in the spinosad-treated group were 22.9% and 67.6% by the dipping and the spraying treatments, respectively. Statistical analysis showed that the survival of P. persimilis was significantly affected by application of spinosad and treatment methods. However, the harmful effects of the dipping treatment on the mites were moderate when compared with spraying. In the field tests conducted in commercial greenhouse roses where P. persimilis were released and colonized, different amounts of spinosad solution, l00 L/1,000 m2 or 500 L/1,000 m2, diluted 5,000 times were sprayed after surveying the numbers of Tetranychus urticae Koch and P. persimilis. Although the number of T. urticae significantly affected the number of P. persimilis, spraying spinosad did not affect P. persimilis. Thus, the generally used application rates of spinosad wettable powder for greenhouse roses did not significantly reduce P. persimilis density.
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[title in Japanese]
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