Pest Management Science (2020) 76, 480-486

Tomohisa Fujii, Sachiyo Sanada-Morimura, Takaho Oe, Manami Ide, Dinh Van Thanh, Ho Van Chien, Phan Van Tuong, Phung Minh Loc, Le Quoc Cuong, Ze-Wen Liu, Zeng-Rong Zhu, Jian-Hong Li, Gang Wu, Shou-Horng Huang, Gerardo F. Estoy Jr, Shoji Sonoda and Masaya Matsumura (2020)
Long-term field insecticide susceptibility data and laboratory experiments reveal evidence for cross resistance to other neonicotinoids in the imidacloprid-resistant brown planthopper Nilaparvata lugens
Pest Management Science 76 (2), 480-486
Abstract:
BACKGROUND
Long-term monitoring data is helpful to understand the fluctuation of susceptibility and pattern of cross resistance in insecticide resistance management. After the occurrence of imidacloprid resistance, the brown planthopper (BPH) has gradually developed resistance to thiamethoxam and clothianidin since 2010, but not to dinotefuran and nitenpyram. Here, we analyzed susceptibilities data of five neonicotinoids during 2005–2017 in East Asia and Vietnam to conduct cross-resistance patterns among neonicotinoids. To determine the factors of development of cross resistance in laboratory bioassays, we used the imidacloprid resistant and control strains that were selected from filed populations in the Philippines and Vietnam.
RESULTS
The Linear Mixed Models (LMM) analyses of insecticide susceptibility data showed that the slope values of imidacloprid resistance effects were 0.68 and 1.09 for resistance to thiamethoxam and clothianidin, respectively. Laboratory bioassay results showed that the LD₅₀ values for thiamethoxam and clothianidin in resistant strains (1.4–5.5 μg g^-1) were 3.2–16.4 times higher than those in the control strains (0.28–1.5 μg g^-1). However, the increase in the LD₅₀ values for imidacloprid was not related to that for dinotefuran and nitenpyram based on the results of the LMM analysis and laboratory bioassay.
CONCLUSION
Our results demonstrate that the development of imidacloprid resistance result in strong-cross resistance to some neonicotinoids, thiamethoxam and clothianidin, but not to others, dinotefuran and nitenpyram. We anticipate that our findings will be a starting point for understanding mechanism of the different trend of cross resistance by analyzing long-term susceptibility data and laboratory bioassays in insect pests.
(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): Zeng-Rong Zhu, Gang Wu, Shou-Horng Huang, Shoji Sonoda, Masaya Matsumura

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