殺虫剤の水面施用によるウンカ・ヨコバイ類の防除に関する研究

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  • Studies on the Control of Leaf- and Planthoppers by Submerged Application with Insecticides
  • サッチュウザイ ノ スイメンシヨウ ニ ヨル ウンカ ヨコバイルイ ノ ボウジョ ニ カンスル ケンキュウ

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It has been considered that the effect of submerged application with chemical granulars against plant- and leafhoppers is due to the l thal action caused by the sucked juice in which translocated insecticides are involved. Therefore, various granular insecticides were tested on their systemic actions. In the application level of 3kg per 10a, PHC granular (against the small brown planthopper), PHC, MIPC and NAC granulars (against the green leafhopper) showed a systemic lethal function in the adult insects. This effect was only shown in low mortality and was noticed from the third day after application. Although diazinon and disulfoton have shown a good controling effect in practice, both insecticides showed no systemic lethal function in the application level of 43kg per 10a. On the other hand, the results of experiment concerned with the fumigative lethal function in the leaf- and planthoppers showed high fumigative lethal effects in any granular tried in this test, especially diazinon and disulfoton. Supposing from the results of these experiments, the main effect of submerged chemical application in the paddy field is not only due to their killing effect on adult leafhopper which sucked the insecticidecontaining juice of rice plant, but also due to the lethal action caused by the gas evaporated from water surface in the paddy field.

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