Effects of six plant secondary metabolites on activities of detoxification enzymes in Spodoptera litura Mechanisms of pyrethroids resistance in diamondback moth, Plutella xylostella Seasonal dynamics of the resistance to organophosphorus insecticides and its biochemical mechanism in Plutella xylostella (L.) Effect of Spinosad on the Detoxifying and Protective Enzymes of Malacosoma neustria testacea Gene expression of a detoxification enzyme in Tetranychus urticae resistant to fenpropathrin Effect of Transgenic Poplars on the Activities of Detoxification Enzymes in Micromelalopha troglodyta Larvae