Pest Management Science (2008) 64, 1122-1125

Kevin Gorman, Zewen Liu, Ian Denholm, Kai-Uwe Brüggen and Ralf Nauen (2008)
Neonicotinoid resistance in rice brown planthopper, Nilaparvata lugens
Pest Management Science 64 (11), 1122-1125
Abstract: BACKGROUND: Rice brown planthopper, Nilaparvata lugens Stål, is a primary insect pest of cultivated rice, and effective control is essential for economical crop production. Resistance to neonicotinoid insecticides, in particular imidacloprid, has been reported as an increasing constraint in recent years. In order to investigate the extent of resistance, 24 samples of N. lugens were collected from China, India, Indonesia, Malaysia, Thailand and Vietnam during 2005 and 2006. Their responses to two diagnostic doses of imidacloprid (corresponding approximately to the LC₉₅ and 5 × LC₉₅ of a susceptible strain) were examined.
RESULTS: Ten of the 12 samples collected during 2005 were found to be susceptible to imidacloprid, but two late-season samples from India showed reduced mortality at both diagnostic doses. All 13 strains collected in 2006 showed reduced mortality at both doses when compared with the susceptible strain. Dose-response lines showed resistance in one of the most resistant field strains to be approximately 100-fold compared with the susceptible standard.
CONCLUSION: The data demonstrate the development and spread of neonicotinoid resistance in N. lugens in Asia and support reports of reduced field efficacy of imidacloprid.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Ralf Nauen, Ian Denholm, Kevin Gorman

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Nilaparvata lugens		Indonesia
	Nilaparvata lugens		Malaysia
	Nilaparvata lugens		Thailand
	Nilaparvata lugens		Vietnam
	Nilaparvata lugens		India