Trials of control of the cat flea, Ctenocephalides felis (Bouche), by using candidate formulations containing pyriproxyfen, a juvenile hormone analogue, under semi-field conditions

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  • ネコノミに対するpyriproxyfen配合スプレー剤の駆除効果
  • ネコノミ ニ タイスル pyriproxyfen ハイゴウ スプレーザイ ノ クジョ コウカ

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Abstract

We observed the effects on the cat flea, Ctenocephalides felis (Bouche), on the cats and their environmental infestation by spraying the cats directly with flowable formulations containing synergized d-allethrin (synergist: N-(2-ethylhexyl)-bicycro[2,2,1]-hepta-5-en-2,3-dicarboximide; McLaughlin Gormley King Co., USA) and 0.16% or 0.4% pyriproxyfen, a juvenile hormone analogue. For comparision. three groups were evaluated; the first group of cats was treated with a synergized d-allethrin formulation only, the second group was treated with synergized d-allethrin and 0.16% or 0.4% pyriproxyfen formulation at a rate of 8 ml/kg of body weight, and the third group was treated with no insecticide formulation as control. The following results were obtained. The peak of adult cat flea infestation on the host, treated with the formulation containing pyriproxyfen, was at seven days after treating. Then, the population of fleas gradually decreased, and finally showed 100% reduction and such population was continued for 51 days. The hatching of eggs collected from cats treated with the formulation containing pyriproxyfen was completely inhibited for 70 days. The population of eggs, larvae and adults of cat fleas in the model room housing cats treated with the formulation containing pyriproxyfen, showed 100% reduction in 41, 19 and 23 days, respectively. The carpet in the room housing cats treated with the pyriproxyfen formulation indicated residual effectiveness of ovicidal. It can be concluded that flea infestations on cats may be controlled by pyriproxyfen in a test formulation applied directly onto cats. Therefore, pyriproxyfen can interrupt the flea life cycle and prevent new flea reinfestation.

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