Abstract: 【Aim】 Sucking insect pests have become the major cotton pests since transgenic Bt cotton was widely planted in the northern areas of China. The objective of this study is to make clear the status of insecticide resistance of the major cotton pests, so as to advise farmers to scientifically control insect pests. 【Methods】 Dynamic changes in insecticide resistance of Helicoverpa armigera, Aphis gossypii and Apolygus lucorum from Qiuxian County in Hebei Province, Binzhou City in Shandong Province, Xihua County in Henan Province were monitored from 2013 to 2015 using leaf dipping method and topical application method, respectively. 【Results】 The resistance levels of H. armigera to phoxim and cyhalothrin increased to over 20-fold, and H. armigera became resistant to emamectin benzoate, with a resistance ratio of 10-fold. The resistance ratios of A. gossypii to omethoate, cypermethrin and imidacloprid were over 100-fold. For A. lucorum, although its resistance to imidacloprid increased from susceptible to over 10-fold in the Qiuxian and Binzhou populations, the resistance ratios to malathion and methomyl remained below 10-fold in all the detected populations. However, the Binzhou population of A. lucorum showed 95-fold resistance to cyhalothrin. According to the resistance monitoring results, a rotation-based resistance management strategy was established and implemented in the cotton demonstration areas in Binzhou City, Shandong Province. Compared with conventional farmer-decisive farm, the cotton demonstration areas obtained good benefits, characterized by a 3-fold reduction of pesticide application, a 7.53% yield increase, and an extra income of 109.16 Yuan per 667 m². 【Conclusion】 Insecticide resistance of the major cotton insect pests in the northern areas of China has developed, and rotation-based resistance management strategies are needed.

Key words: Cotton, insect pest, Helicoverpa armigera, Aphis gossypii, Apolygus lucorum, insecticide resistance monitoring, management demonstration