Chemical and biological control of land-dwelling leech, Haemadipsa japonica

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  • SASAKI Osamu
    Laboratory of Animal Hygiene, Department of Animal Science, Akita Prefectural College of Agriculture
  • TANI Shigekazu
    IKARI Company, Environment Hygiene School

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  • ヤマビルの化学的・微生物学的防除
  • Chemical and biological control of land

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Chemical and biological control of land-dwelling leech, Haemadipsa japonica, was carried out in Akita Prefecture, north Japan. Two-times spraying of a microcapsule formulation of 5% DEET (June and July) fairly controlled the occurrence of leeches. When entomopathogenic fungi, Beauveria bassiana and Fusarium solani (isolated from dead leeches), were infected to leeches, all pests died within 3-4 days post-infection. Also, both fungi were effective against leeches in the field. It was concluded that leeches dwelling around the residential areas can be controlled by 5% DEET, and biological control with fungi could be the most potential way to reduce the impact of the pest in the forest.

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