不同玉米新品种田间抗蚜性比较

在田间自然感虫状态下,采用5点取样法记录玉米蚜虫在不同玉米品种上的危害状况,对21个品种用蚜量比值法进行抗蚜性鉴定,对玉米蚜虫高峰期蚜量比值测定玉米抗蚜性进行可行性分析。结果表明,不同玉米品种抗蚜性差异较大,金西南8号和陇玉1号为高抗品种,桂单203、青青601、珍禾978、周玉913、贝玉10、普玉3号、水金玉8号、云合2号为易感品种。玉米蚜虫天敌数量与玉米蚜虫口数变化规律出现相对一致性,玉米品种的益害比与蚜量比值呈幂函数关系,益害比随蚜量比值的增大而减小。

Comparison of Aphid Resistance of Different Common Maize Varieties in Field

The damage status of maize aphids on different maize varieties was recorded by 5-point sampling method under the natural susceptibility condition in the field. The aphid resistance of 21 varieties was identified by aphid-to-aphid ratio method, and the feasibility of aphid-to-aphid resistance of maize was analyzed by aphid-toaphid ratio in peak period. The results showed that there were significant differences in aphid resistance among different maize varieties. Guidan203, Qingqing601, Zhenhe978, Zhouyu913, Beiyu 10, Puyu 3, Shuijinyu 8, and Yunhe 2 were highly resistant varieties. The number of natural enemies of maize aphids was consistent with the population of maize aphids. The ratio of benefit to the harm of maize varieties to aphids was a power function. The benefitharm ratio decreased with the increase of aphid population ratio.