Acta Entomologica Sinica (2008) 51, 930-937

Li-Hua Wang, Ji-Chao Fang and Bao-Sheng Liu (2008)
[Relative toxicity of insecticides to Laodelphax striatellus (Fallén) (Homoptera : Delphacidae) and the resistance of field populations from different areas of East China]
Acta Entomologica Sinica 51 (9), 930-937
Abstract: Relative toxicity index of 11 insecticides belonging to six different categories against the 3rd-instar nymphs of Laodelphax striatellus (Fallen) and the resistance of the nymphs from 7 typically ecological sites in East China to 10 of these insecticides were surveyed with rice seedlings-dipped method. The results indicated that the toxicity of acephate was the lowest among the 11 insecticides, which was used as reference standard herein. The relative toxicity of the other 10 insecticides to the nymphs in a descending turn was fipronil, buprofezin, abamectin, thiamethoxam, alpha- cypermethrin, IPP (a new nitromethylene-compound), chlorpyrifos, dichlorvos, triazophos and imidacloprid. Compared with Yunnan (YN) susceptible population collected from fields of Chuxiong, Yunnan province in 2001, the 7 field populations respectively from Jurong (JR), Tongzhou (TZ), Chuzhou (CZ), Dafeng (DF), Nanjing (NJ) and Suzhou (SZ) of Jiangsu province and Lujiang (LJ) of Anhui province in 2007 showed very high resistance to buprofezin with the resistance ratio over 200-fold, and medium or high resistance to alpha- cypennethrin with the resistance ratio of 7.8 - 108.8 fold. The LJ population showed 7.7- and 12.0-fold resistance to triazophos and chlorpyrifos, respectively, and the CZ, NJ, DF and JR populations showed 5.7 - 12.6-fold resistance to chlorpyrifos. All the 7 field populations of L. striatellus were sensitive to dichlorvos, fipronil, avermectins, imidacloprid, thiamethoxam and IPP.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Jichao Fang

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Laodelphax striatellus	Rice (Oryza)	China (south)
	Laodelphax striatellus	Rice (Oryza)	China (NE)