Applied Entomology and Zoology

, Volume 46, Issue 1, pp 65–73 | Cite as

Current status of insecticide resistance in the small brown planthopper, Laodelphax striatellus, in Japan, Taiwan, and Vietnam

  • Sachiyo Sanada-Morimura
  • Shinji Sakumoto
  • Reiko Ohtsu
  • Akira Otuka
  • Shou-Horng Huang
  • Dinh Van Thanh
  • Masaya Matsumura
Original Research Paper


The small brown planthopper, Laodelphax striatellus, is one of the most serious pest insects of rice plants. A large migration of the insects from overseas was reported in western parts of Japan in June 2008. Insecticide resistance to imidacloprid, fipronil and BPMC was compared among local populations in these western regions after migration. The insecticides were applied to the insects using a topical application method. In some populations, the resistance status coincided with that of the immigrant insects just after migration, i.e., resistance to imidacloprid but susceptibility to fipronil. In other populations, resistance was observed not only against imidacloprid but also fipronil. It is likely that the status of the latter populations resulted from intercrossing between domestic populations of the insects and migrants. Insecticide resistance was also assessed in other areas of northern and eastern parts of Japan. In general, these populations showed relatively low resistance, although resistance to fipronil was high in the eastern part of Japan where the density of domestic populations has recently increased. Insecticide susceptibilities were also assessed in several sites in Taiwan and the northern parts of Vietnam. Although susceptibilities differed among these sites or countries, they have recently seen a decline for all three insecticides.


Imidacloprid Fipronil BPMC Long-distance migration Topical application 



The authors thank Koji Nakagawa, Hiroyuki Etoh, Miyuki Sakai, Toshinobu Nakamura, Yuji Kajitani, Yurika Koga, Hideko Murakami, Shinichiro Shobu, Yozo Hashimoto, Kiyomitsu Ito, Kazumi Ikezawa, Nobuyuki Endo, Keiichiro Matsukura, Yi-Shin Chen, Ta-Chi Yang, Nguyen Thi Duong and Lai Tien Dung for their help in collecting L. striatellus. Thanks are due to Kayoko Abe, Reiko Yamada and Akiko Okada for their assistance in testing for insecticide resistance and laboratory rearing of the insects.


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Copyright information

© The Japanese Society of Applied Entomology and Zoology 2010

Authors and Affiliations

  • Sachiyo Sanada-Morimura
    • 1
  • Shinji Sakumoto
    • 2
  • Reiko Ohtsu
    • 3
  • Akira Otuka
    • 1
  • Shou-Horng Huang
    • 4
  • Dinh Van Thanh
    • 5
  • Masaya Matsumura
    • 1
  1. 1.National Agricultural Research Center for Kyushu Okinawa RegionKoshiJapan
  2. 2.Kumamoto Prefectural Agricultural Research CenterKoshiJapan
  3. 3.Nagasaki Plant Protection StationIsahayaJapan
  4. 4.Chiayi Agricultural Experiment StationTaiwan Agricultural Research Institute, Council of AgricultureChiayiTaiwan, ROC
  5. 5.Plant Protection Research InstituteVietnam Academy of Agriculture ScienceHanoiVietnam

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