ナミハダニの発育とcycloprateの生理活性

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  • Toxicity of Cycloprate to the Two-spotted Spider Mite, <i>Tetranychus urticae</i> KOCH, in Laboratory (Acarina: Tetranychidae)
  • ナミハダニ ノ ハツイク ト cycloprate ノ セイリ カッセイ

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Toxicity of cycloprate (ZARDEX®, ZR-0856, hexadecyl cyclopropanecarboxylate) to the egg, larva, nymph and adult of Tetranychus urticae was investigated by bioassay method using kidney bean leaves. Toxicity of cycloprate to eggs was evaluated by the hatch inhibition and larval mortality soon after hatching. Both activities decreased with the treatments at the later stage of egg development. Lethal effect of cycloprate on larvae and nymphs was lower in mobile stage than during the time of quiescence, or soon after moulting. The lethal effect on adults was low and the surviving female adults deposited as many eggs as the controls, although the number of offspring was markedly reduced. Sterilizing effect of cycloprate on female adults was only a transitory phenomenon. The reduction in the number of offspring might be due to the hatch inhibition of laid eggs caused by residues of cycloprate on leaves contaminating the eggs. The results of the present experiments show that the reduction in mite population consecutive to field application of cycloprate may be ascribed to the inhibitory effect on both egg hatch and larval and nymphal development.

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