Insecticide Susceptibility of the Rice Leafroller Larvae, Cnaphalocrocis medinalis GUENEE (Lepidoptera : Pyralidae)

概要

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Insecticide susceptibility of the rice leafroller larvae, Cnaphalocrocis medinalis GUENEE, has been surveyed by the leaf-dipping method since 1979. The ratio of LC_<50> of 5th-instar larvae to that of 1st instar has ranged from 4.8 of fimethylvimphos to 14.5 of chlorpyrifosmethyl. The LC_<50> values of larvae for several insecticides did not change with advacement of the generations except for chlorpyrifos-methyl in 1981. Insecticide susceptibility of different migration waves in Nagasaki populations in 1983 and 1985 did not differ.LC_<50> values of Ishigaki and East China Sea populations for several insecticides were smaller than Kyushu main island populations. Ratios of average LC_<50> values for diazinon, acephate, isoxathion, monocrotophos and cartap obtained in 1985 to those obtained in 1981 were 9.4,2.7,1.6,1.6 and 1.2,respectively, but the ratios for chlorpyrifos-methyl, dimethylvinphos and tetrachlorvinphos were less than 1.
日本応用動物昆虫学会の論文
1987-05-25