关键词: 棉蚜, 桉油精, 农药复配, 增效作用, 田间防效

Abstract:

Aphis gossypii Glover is a globally devastating pest that has developed resistance to various insecticides. To delay the development of resistance and achieve the efficient use of biopesticides, this study evaluated the combined toxicity and field efficacy of a 5% eucalyptol soluble concentrate (SL) in combination with three novel insecticides: 50% sulfoxaflor water dispersible granules (WG), 50 g/L afidopyropen dispersible concentrate (DC), and 10% flonicamid water dispersible granules (WG). The combination toxicity was determined using the dipping method. Through interactive testing and calculation of co-toxicity coefficients (CTC), three combinations with significant synergistic effects were identified: eucalyptol+sulfoxaflor (active ingredient ratio of 8:1, CTC＝826.83), eucalyptol+afidopyropen (2;1, CTC＝261.37), and eucalyptol+flonicamid (13:1, CTC＝293.23). Field trials showed that the three mixtures achieved 7-day control efficacies of 91.79%, 96.17%, and 96.04% against A. gossypii, representing increases of 10.92%—13.19%, 15.23%—17.57%, and 11.70%—17.44% over the respective single agents, while effectively reducing chemical pesticide usage. These finding provide crucial theoretical basis and data support for the green control and resistance management of A. gossypii.

Key words:

Aphis gossypii, eucalyptol, pesticide combination, synergistic effect, field efficacy