Absorption, Translocation, and Persistence of Diazinon in Rice Plants

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  • HIRANO Chisato
    Division of Entomology, National Institute of Agricultural Sciences
  • YUSHIMA Takeshi
    Division of Entomology, National Institute of Agricultural Sciences

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  • 灌漑水へ施用されたダイアジノンのイネ体内への移行
  • カンガイスイ エ シヨウ サレタ ダイアジノン ノ イネ タイナイ エ ノ イコウ

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In two series of tests with rice plants grown on soil in pots, 32P-labeled diazinon granules were broadcast onto irrigation water or applied into culture soils. Study was done on dissolution and hydrolysis rates of 32P-diazinon in water, and absorption, translocation, and persistence of insecticidal-32P activity as well as total radioactivity in rice plants. When granules were broadcast onto irrigation water, diazinon dissolved rapidly into the water, with the highest concentration at 3 days after application. Thereafter diazinon level in the water lowered rapidly owing to absorption by plants and hydrolysis into non-insecticidal compounds. Diazinon and its hydrolysis products were absorbed into plants through leaf-sheath; although some of the absorbed radioactive compounds translocated to leaf-blade and root, most of them were retained in the leaf-sheath. When granules were applied into soils, no radioactivity was detected in the irrigation water. Absorption of radioactivity from soils was conducted by the root, and most of the radioactive compounds translocated to the leaf-blade but less to the leaf-sheath. Among total radioactivity in the rice plants, percentage of insecticidal radioactivity was much higher in the leaf-sheath than in the leaf-blade. Broadcasting the diazinon granules onto irrigation water seemed to be a better way for control of the rice stem borer larvae (Chilo suppressalis) attacking on the leaf-sheath, as compared with the granule application into soils.

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