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Fenpyroximate Resistance in Tetranychus Urticae (Acari: Tetranychidae): Cross-Resistance and Biochemical Resistance Mechanisms

Fenpyroximate Resistance in Tetranychus Urticae (Acari: Tetranychidae): Cross-Resistance and Biochemical Resistance Mechanisms

Young-Joon Kim, Si-Hyeock Lee, Si-Woo Lee, Young-Joon Ahn

Pest Manag Sci. 2004 Oct;60(10):1001-6.

PMID: 15481826

Abstract:

A field colony of the Two-spotted spider mite, Tetranychus urticae (Koch), resistant to fenpyroximate was further selected with fenpyroximate 5SC for 20 generations at a selection pressure of 30-50% mortality (designated as FR-20 strain). Resistance and cross-resistance levels of the FR-20 strain to 18 acaricides were determined using a spray method. The FR-20 strain was extremely resistant to fenpyroximate [resistance ratio (RR) 252]. The strain exhibited extremely strong positive cross-resistance to acrinathrin (RR 196), and high levels of resistance to benzoximate (RR 55) and propargite (RR 64). Moderate levels of cross-resistance (RR 11-40) to abamectin, fenbutatin oxide, fenpropathrin, pyridaben, pyridaben + bifenthrin and tebufenpyrad were observed. The FR-20 strain showed low levels of resistance (RR < 10) to azocyclotin, bromopropylate, chlorfenapyr, chlorfenapyr + bifenthrin, chlorfenapyr + pyridaben, dicofol, fenazaquin and milbemectin. Synergist experiments with different metabolic inhibitors revealed that piperonyl butoxide had the greatest effect on the efficacy of fenpyroximate, followed by iprobenfos and triphenyl phosphate. In a comparative assay with detoxifying enzymes, the FR-20 strain showed 2.5-fold higher activity in p-nitroanisole-O-demethylation, and 2.5- and 2.2-fold higher activities in alpha- and beta-naphthyl acetate hydrolysis, respectively. These results suggested that enhanced activities of both mixed-function oxidases and esterases likely contribute to the fenpyroximate resistance of the FR-20 strain of T urticae.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP134098616	Fenpyroximate		134098-61-6	Price

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