ウンカ類の種間における殺虫剤の選択毒性

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タイトル別名
  • Selective Toxicity of Several Insecticides on Three Planthoppers
  • ウンカルイ ノ タネ カン ニ オケル サッチュウザイ ノ センタク ドクセイ

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Toxicity of several organophosphorous, carbamate, and chlorinated hydrocarbon insecticides on three species of planthoppers on rice plants was determined by the micro-topical application method. The insects tested were the adults of the brown planthopper, Nilaparvata lugens (STÅL), the white-backed planthopper, Sogatella furcifera (HORVATH), and the smaller brown planthopper, Laodelphax striatellus (FALLÉN). Insecticides were applied by means of an applicator that consisted of a screw micrometer and an ultra microsyringe used for injecting the samples in gaschromatographic analysis. This device enabled the quick application of as small as 0.05μl solution of insecticide dissolved in acetone to the thoracic regions of the test insects. Treated insects were placed at 25°C, and the mortality counts were taken at 24 hours after treatment. Comparison of LD50's indicated as follows: (1) The organophosphorous insecticides tested are the most selective insecticides showing much lower toxicity to the brown planthopper than to the white-backed planthopper and the smaller brown planthopper, and they are slightly less toxic to the white-backed planthopper than to the smaller brown planthopper. (2) The carbamate insecticides are the most toxic group of the compounds tested. They are almost equal in toxicity to the three species of the planthoppers with the exception of several which show relatively lower toxicity to the smaller brown planthopper. (3) The chlorinated hydrocarbon insecticides are less toxic than the organophosphorous and the carbamate insecticides, and their toxicity are not selective. (4) There is no significant difference in the susceptibility between males and famales.

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