Entomologia Sinica (2003) 10, 35-41

Lin He, Zhi-Mo Zhao, Xin-Ping Deng, Jin-Jun Wang and Huai Liu (2003)
Estmation of realized heritability of resistance to fenpropathrin, abamectin, pyridaben and their mixtures in acaricide-selected strains of Tetranychus cinnabarinus (Boiduval)
Entomologia Sinica 10 (1), 35-41
Abstract: Threshold trait analysis was used to estimate realized heritability (h²) of resistance to five acaricides (three single acaricide and two mixtures) and resistance risk in Tetranychus cinnabarinus (Boiduval). Tetranychus cinnabarinus collected from the field of Beibei, Chongqing reared more than 60 generations under pesticide free conditions and considered susceptible. Successively selected for about 30 generations, the strain had a 65.55-, 5.82-, 1.23-, 5.20- and 1.42-fold increase in resistance to fenpropathrin, abamectin, pyridaben, pyridaben-abamectin (pyridaben: abamectin = 7.4:0.1, m/m) and fenpropathrin-abamectin (fenpropathrin: abamectin = 8.9:0.1, m/m), respectively. The realized heritability of resistance to fenpropathrin, abamectin, pyridaben, pyridaben-abamectin (pyridaben: abamectin = 7.4:0.1, m/m) and fenpropathrin-abamectin (fenpropathrin: abamectin = 8.9:0.1, m/m) is 0.2167, 0.0967, 0.0130, 0.0800 and 0.0172, respectively. Under the selected condition, a 10-fold increase in resistance would be expected 15 generations for fenpropathrin, 34 generations for abamectin, 333 generations for pyridaben, 42 generations for pyridaben-abamectin (pyridaben: abamectin = 7.4:0.1, m/m) and 200 generations for fenpropathrin-abametcin (fenpropathrin: abamectin = 8.9:0.1, m/m). The highest resistance risk of the five acaricides in Tetranychus cinnabarinus was fenpropathrin, then abamection, pyridaben-abamectin (pyridaben: abamectin = 7.4: 0.1, m/m), fenpropathrin- abamectin (fenpropathrin: abamectin = 8.9:0.1, m/m) and that to pyridaben was the lowest. The mixture of pyridaben and abamectin is not useful in delaying development of resistance in the pest to the two single acaricide while the mixture of fenpropathrin and abamectin could do it.
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Link to article at publishers website
Database assignments for author(s): Lin He, Jin-Jun Wang

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranychus cinnabarinus		China (south)