Effects of pesticides on a predatory bug, <i>Nesidiocoris tenuis</i> (Reuter), in Okayama Prefecture, Japan

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  • Nishi Yusuke
    Research Institute for Agriculture, Okayama Prefectural Technology Center for Agriculture, Forestry and Fisheries
  • Matsuoka Hiroyuki
    Present affiliation, Department of Dissemination Collaboration, Okayama Prefectural Technology Center for Agriculture, Forestry and Fisheries
  • Kuroyanagi Yasunori
    Research Institute for Agriculture, Okayama Prefectural Technology Center for Agriculture, Forestry and Fisheries
  • Namba Kana
    Research Institute for Agriculture, Okayama Prefectural Technology Center for Agriculture, Forestry and Fisheries

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  • 岡山県における土着天敵タバコカスミカメに対する農薬の影響
  • オカヤマケン ニ オケル ドチャク テンテキ タバコカスミカメ ニ タイスル ノウヤク ノ エイキョウ

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<p>Using an insect-dip method, the toxicity of 57 pesticides (32 insecticides, 20 fungicides, and 5 spreading agents) was tested against adults and nymphs of the predatory bug Nesidiocoris tenuis (Reuter) (Hemiptera: Miridae) collected in Akaiwa, Okayama Prefecture, Japan. Diamides (IRAC code: 28), some acaricides (IRAC codes: 10A, 20B, and 25A), most other groups of insecticides (IRAC codes: 7C, 9B, 17, 23, 29, UN), most fungicides, and two spreading agents were considered nontoxic (corrected mortality <30%) to N. tenuis. Seven insecticides (a mixture of fenpyroximate and buprofezin, bifenazate, fenpyroximate, a mixture of pyflubumide and fenpyroximate, polyglycerin fatty acid ester, hydrogenated starch hydrolysate, and fatty acid glycerides), four fungicides (kresoxim-methyl, fenpyrazamine, tetrachloroisophthalonitrile, and sodium hydrogen carbonate) and three spreading agents (a mixture of sorbitan fatty acid ester and polyoxyethylene resin acid ester, a mixture of polyoxy alkylene oxypropyl heptamethyltrisiloxane and polyoxyalkylene propenyl ether, and polyoxyethylene methylpolysiloxane) were slightly toxic (corrected mortality = 30–79%). Lufenuron, metaflumizone, and blended oil were moderately toxic (corrected mortality = 80–98%). Permethrin, sulfoxaflor, abamectin, emamectin benzoate, indoxacarb, and fluxametamide were highly toxic (corrected mortality >99%) to adults, nymphs, or both. The use of nontoxic or slightly toxic pesticides on N. tenuis should be recommended in integrated pest management using this predatory bug.</p>

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