Changes in Insecticide Susceptibility of the Rice Leafroller, Cnaphalocrocis medinalis GUENEE(Lepidoptera:Pyralidae), Collected in Kyushu, and Differences in Susceptibility between Japanese and Malaysian Colonies

概要

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Insecticide susceptibility of 1st instar larvae of the rice leafroller Cnaphalocrocis medinalis GUENEE, collected from 1988 to 1991 in Kyushu, was measured by leaf dipping method. The LC_<50> values of diazinon for 1988-1991 colonies were more than 10 times larger than those for the 1981 colony. The LC_<50> values of monocrotophos for 1990 and 1991 colonies were 8 and 28 times larger respectively, than those for the 1981 colony. However, the LC_<50> values of other insecticides for the 1988-1991 colonies did not differ from those for the 1981 colony. There were some differences in insecticide susceptibility between Japanese and Malaysian colonies of the rice leafroller. I_<50> values of monocrotophos for the 1991 colony were 10 times larger than those for the 1989 colony. These colonies differed in their insecticide susceptibility to monocrotophos by a factor of 23. It was supposed that insensitivity of acetylcholinesterase to monocrotophos was involved in the rice leafroller resistance to monocrotophos.
日本応用動物昆虫学会の論文
1993-05-25