Recent Trends of Insecticide Susceptibility in the Brown Planthopper, Nilaparvata lugens StAl (Hemiptera: Delphacidae), in Japan

Abstract

The brown planthopper, Nilaparvata lugens StÅl, is known to immigrate annually into Japan from overseas, primarily from mainland China. The susceptibility to insecticides of the brown planthopper in the Ono area, Hyogo Prefecture, was monitored annually for 8 years, from 1980 to 1987, by the micro topical application technique. The susceptibility to 8 insecticides tested fluctuated greatly at levels which indicated some degree of resistance. The brown planthopper collected in 1984 and 1985 showed extremely high LD50 values to both carbamates and organophosphates. Data for other prefectures showed similar fluctuations. The LD50 values for 1984 and 1985 were also high. © 1993, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.