Susceptibility to Insecticides in Scirtothrips dorsalis HOOD (Thysanoptera: Thripidae) Collected from Tea Fields in the South Region of Kyoto Prefecture

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  • 京都府南部地域の茶園に生息するチャノキイロアザミウマの薬剤感受性
  • キョウトフ ナンブ チイキ ノ サエン ニ セイソク スル チャノキイロアザミウマ ノ ヤクザイ カンジュセイ

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Abstract

Susceptibility to 20 insecticides in Scirtothrips dorsalis HOOD female adults collected from 17 tea fields in the south region of Kyoto Prefecture determined by leaf-dipping method during 1998-2000.<BR>Acetamiprid, imidacloprid, nitenpyram (choloronicotinil), DMTP, acephate (organic phosphorus), chlorfenapyr (pyrrole) and emamectin benzoate (macrolide) were highly effective against more than 90% of the collected populations.<BR>Methomyl (carbamate), bifenthrin (pyrethroid) and prothiofos (organic phosphorus) were highly effective against 70-90% of the collected populations.<BR>Cartap (nereistoxin), acrinathrin, ethofenprox, halfenprox, fenpropathrin, fluvalinate and permethrin (pyrethroid) were highly effective against 40-65% of the collected populations.<BR>Diafenthiuron and pyridaben were highly effective against only 20% of the collected populations.<BR>There were no significant correlations between the susceptibility of the collected populations and the years after the registration of the insecticides.<BR>The annual number of chemical spraying on tea fields in the collected sites varied from 5 to 19, and more than a half number of applications are registered against Scirtothrips dorsalis HOOD.

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