Selection and Biochemical Mechanism of the Resistance to Pyridaben in Panonychus citri

Panonychus citri were treated with pyridaben in laboratory. The results showed that the resistance ratio of the pest to the acaricide reached 34.96-fold after 12-generations treatment. The resistant strain displayed cross-resistance to omethoate、amitraz、cyhalothtin、isocarbophos and propargite. The mechanism studies showed that resistance to pyridaben was mainly associated with the increasing activities of glutathione transferase、mixed-function oxidases and Acetylcholinesterase.