Pest Management Science (2009) 65, 1040-1046

Dong Wang, Xinghui Qiu, Xuexiang Ren, Wencheng Zhang and Kaiyun Wang (2009)
Effects of spinosad on Helicoverpa armigera (Lepidoptera: Noctuidae) from China: tolerance status, synergism and enzymatic responses
Pest Management Science 65 (9), 1040-1046
Abstract: BACKGROUND: Spinosad is increasingly used in pest management programmes, and resistance to it has been detected in recent years. However, there is no report on the susceptibilities of field populations of Helicoverpa armigera (Hübner) from China. Furthermore, the impact of spinosad on metabolic enzymes in this pest remains unknown.
RESULTS: Four populations of H. armigera from different locations in China displayed less than 6.5-fold difference in LC₅₀ to spinosad, the highest being in the Xinjiang population, followed by Xiajin, Taian and Hubei populations, while there was no significant difference at LC₉₉ level among the four populations. The toxicity of spinosad could be synergised by piperonyl butoxide (PBO) and triphenylphosphate (TPP), but not by diethyl maleate (DEM). Spinosad exposure for 48 h significantly increased the activities of p-nitroanisole O-demethylase (ODM), while no significant changes in glutathione-S-transferase (GST) and carboxyl esterase (CarE) were observed.
CONCLUSION: Field populations of H. armigera from China displayed marginally different susceptibilities to spinosad and had a relatively low LC₅₀. Cytochrome P450 monooxygenase might be involved in the metabolism of, and hence resistance to, spinosad in this pest in China.
(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): Xinghui Qiu

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.
	Helicoverpa armigera		China (south)
	Helicoverpa armigera		China (NE)
	Helicoverpa armigera		China (NW)