Abstract: 【Aim】 This study aims to assess the current status of insecticide resistance in wheat aphids and the field trial efficacy of some common insecticides to these pests in Shandong Province, so as to screen highly effective and low toxic insecticides to wheat aphids. 【Methods】 Two field populations of wheat aphids were collected from Yanggu and Wenshang in Shandong Province during 2013-2014. Resistance levels of the two field populations to six insecticides (imidacloprid, beta-cypermethrin, omethoate, deltamethrin, pirimicarb and sulfoxaflor) were tested by residual film methods, and the control efficacy of 8 insecticides was evaluated using field trials in 2015. 【Results】 The bioassay results showed that the field populations of Rhopalosiphum padi and Sitobion avenae remained sensitive to the six insecticides in 2013 and 2014, except that the Yanggu population of R. padi developed a low-level resistance to beta-cypermethrin in 2014. Comprehensive evaluation of field efficacy indicated that sulfoxaflor 50% WG, acetamiprid 20% WP, imidacloprid 10% WP and pirimicarb 50% WP had quick-acting property on wheat aphids, and the control efficacy was 76.9%-85.6% at 3 d after treatment. Sulfoxaflor 50% WG, acetamiprid 20% WP, imidacloprid 10% WP, omethoate 40% EC, pymetrozine 25% WP, pirimicarb 50% WP and chlorpyrifos 40% EC had long persistent effects on wheat aphids, and the control efficacy was 80.0%-97.5% at 7 d after treatment. The control efficacy of lambda-cyhalothrin 25 g/L EC against wheat aphids was only 74.9% at 7 d after treatment, significantly lower than that of other insecticides. 【Conclusion】 These results suggest that sulfoxaflor, acetamiprid, imidacloprid, pirimicarb and pymetrozine have high efficacy on wheat aphids, and these insecticides should be used alternately in the control of field wheat aphids.

Key words: Rhopalosiphum padi, Sitobion avenae, beta-cypermethrin, sulfoxaflor, insecticide resistance, field trial, control efficacy