采用环境气候室人工接蚜虫鉴定和累计蚜情指数（I_aa）评判法，对22份玉米品种进行抗玉米蚜Rhopalosiphum maidis Fitch鉴定。结果表明，不同玉米品种的抗蚜性差异显著，在抗性品种上玉米蚜种群数量为负增长，产生的有翅蚜少；在感虫品种上玉米蚜种群数量急剧增长，并伴随大量有翅蚜产生。I_aa值从高抗蚜品种的1.1到高感品种的31.4。高感或感蚜品种9个，占比41%；中抗和抗蚜品种4个，占比18%；高抗品种9个，占比41%。生产上推广种植面积较大的京科968和先玉335等具有中等抗蚜水平，郑单958等高感蚜虫。

Evaluation of corn hybrids for resistance to corn leaf aphid Rhopalosiphum maidis Fitch was carried out by artificial infestation with one day aged nymphs at the Walk-in Environmental Chamber. Accumulative aphid index(I_aa) was mainly used to compare resistant levels of 22 commercialized hybrids. The results showed that there were significant differences in performance of resistance to corn leaf aphid among those hybrids. The population density was a drastic decline in the highly resistant hybrids. Meanwhile the mean number of alatae was also significant less. In contrast, the population density was significantly increased and more alatae were developed in the susceptible hybrids. I_aas ranged from 0.2 to 45.5 representing highly resistant to highly susceptible. Nine of 22 hybrids were highly susceptible and/or susceptible, which accounted for 41%. Four hybrids were resistant or moderately resistant, and nine hybrids were highly resistant, which accounted for 18 and 41%, respectively. Most widely adapted hybrids such as Jingke968 and XY335 demonstrated moderately resistance, but Zhengdan958 performed highly susceptible. These results will provide valuable information for working out a resistant hybrid-based program for IPM of corn leaf aphid in the corn production.

国家重点研发计划项目“北方玉米化肥农药减施技术集成研究与示范”（2017YFD0201800）