Development of Carbamate Resistance in the Brown Planthopper, Nilaparvata lugens STÅL (Homoptera : Delphacidae)

Abstract

Insecticide susceptibility of the immigrant generation of the brown planthopper, Nilaparvata lugens STÅL, collected from the 6 prefectures in Kyushu in 1979 was estimated by the micro-topical application method. Comparison of the data with those obtained in 1967 revealed obvious development of carbamate resistance with an increse of LD50 by approximately 10 times to MTMC (3-tolyl N-methyl carbamate), carbaryl and MIPC (2-isopropylphenyl N-methyl carbamate). Still higher levels of resistance with a 10-30 times increase of LD50 were observed for the organophosphates tested. No significant local difference in insecticide susceptibility was found in this survey covering whole Kyushu distirc.