Pesticide Susceptibility of Two Dominant Phytoseiid Mites, Neoseiulus californicus and N. womersleyi, in Conventional Japanese Fruit Orchards (Gamasina: Phytoseiidae)

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  • AMANO Hiroshi
    Laboratory of Applied Entomology and Zoology, Faculty of Horticulture, Chiba University
  • ISHII Yuki
    Laboratory of Applied Entomology and Zoology, Faculty of Horticulture, Chiba University
  • KOBORI Youichi
    Laboratory of Applied Entomology and Zoology, Faculty of Horticulture, Chiba University

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  • 日本の慣行防除果樹園で優占するミヤコカブリダニとケナガカブリダニの薬剤感受性（英文）

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Abstract

Pesticide (six insecticides and 16 acaricides) susceptibility of populations of N. californicus (4 populations) and N. womersleyi (5 populations) was investigated to test the hypothesis that the recent species replacement between these two species was due to a change in pesticides used in orchards combined with a differential susceptibility of the two species to one or more of the new pesticides. Although the present results cannot provide a clear conclusion regarding factors responsible for the change in dominant phytoseiid, it was suggested, at this point, that none of the pesticides examined here seemed to have a decisive influence on the replacement of N. womersleyi by N. californicus.

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