Journal of Economic Entomology (2014) 107, 1916-1922

Kai Zhang, Wei Zhang, Shuai Zhang, Shun-Fan Wu, Lan-Feng Ban, Jian-Ya Su and Cong-Fen Gao (2014)
Susceptibility of Sogatella furcifera and Laodelphax striatellus (Hemiptera: Delphacidae) to six insecticides in China
Journal of Economic Entomology 107 (5), 1916-1922
Abstract: The whitebacked planthopper, Sogatella furcifera (HorvÁth), and small brown planthopper, Laodelphax striatellus (FallÉn), both are important crop pests throughout China, especially in rice. Application of chemical insecticides is the major control practice. Consequently, insecticide resistance has become an urgent issue. In this study, resistance levels to six conventional insecticides were evaluated for these two species collected from major occurring areas of China. Additionally, imidacloprid- (resistance ratio [RR] = 10.4-fold) and buprofezin (RR = 15.1-fold)-resistant strains of whitebacked planthopper were obtained through laboratory selections for cross-resistance profiling and synergism assessment to understand resistance mechanisms. The results showed that all tested populations of both species exhibited low to high levels of resistance to chlorpyrifos, while remaining susceptible to thiamethoxam. Three of the 14 whitebacked planthopper populations showed low to moderate resistance to imidacloprid, while all small brown planthopper populations reminded susceptible. All small brown planthopper and whitebacked planthopper (except one) populations showed at least moderate resistance (RR = 10.1â€"271.1) to buprofezin. All small brown planthopper populations remained susceptible to pymetrozine and nitenpyram, and all whitebacked planthopper populations remained susceptible to isoprocarb. The imidacloprid-resistant whitebacked planthopper strain showed no significant cross-resistance to other tested insecticides. However, the buprofezin-resistant strain exhibited a low-level cross-resistance (CR = 3.1) to imidacloprid. Piperonyl butoxide, triphenyl phosphate, and diethylmaleate displayed no synergism effect on the resistant whitebacked planthopper strains.
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Link to article at publishers website
Database assignments for author(s): Congfen Gao, Jianya Su

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.
	Sogatella furcifera
	Laodelphax striatellus