On the effect of some insecticides upon the Coccinellid-beetles

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  • Nohara Keigo
    Entomological Laboratory, Faculty of Agriculture, Kyushu University
  • Harada Tsuyoshi
    Entomological Laboratory, Faculty of Agriculture, Kyushu University
  • Ono Takaaki
    Entomological Laboratory, Faculty of Agriculture, Kyushu University

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Other Title
  • 農薬のテントウムシ類に及ぼす影響について
  • ノウヤク ノ テントウムシルイ ニ オヨボス エイキョウ ニ ツイテ

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In this paper the contact toxicity of some insecticide residues to Coccinellid predators, Chilocorus kuwanae, Stethorus japonicus and others, is reported. The results are summarized in Tables 1 and 2. The last instar larvae receive less toxic influence by zincsulphate plus lime sulphur and oils. In very rare cases, some deformed adults emerged from the pupae applied with dormant oil. Many insecticides having longer residual effect proved to be harmful to the newly emerged adults. The influence of organic arsenics upon the adults was less than that of organic phosphates. After the application of organic arsenics, the adults fell into the state of syncope, but many of them recovered soon from the paralytic effect. Although tedion has been said to be ineffective against natural enemies, it was fatal against the young larvae of Stethorus japonicas and would cause this Coccinellid to vacate treated areas.

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