Susceptibility monitoring to Cry1Ie in Asian corn borer Ostrinia furnacalis from 2015 to 2021
To determine the susceptibility of Asian corn borer Ostrinia furnacalis field populations to Cry1Ie,specimens were collected from 14 regions of seven provinces in the north spring corn region and Huang-Huai-Hai summer corn region from 2015 to 2021.Diet-incorporation bioassays were con-ducted to evaluate the susceptibility of these geographic field populations to Cry1Ie.The LC50 values across 54 field populations ranged from 0.65 to 6.28 μg/g,with the lowest LC50 recorded in Qiqihar pop-ulation in 2016 and the highest in the Zhaodong population in 2017.Similarly,the LC95 values ranged from 4.99 to 70.29 μg/g,with the lowest LC95 observed in Hefei population in 2015 and the highest in the Songyuan population in 2017.Compared to the laboratory population,the Tieling population(2018)exhibited the most susceptibility,while the Zhaodong population(2017)displayed the highest tolerance,with resistance rations of 0.26 and 1.17 at the LC50 level,respectively.Although field populations showed different levels of susceptibility,they remained susceptible to Cry1Ie,reflecting natural varia-tion.Therefore,Cry1Ie has the potential for the control of the O.furnacalis.
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