Proper application of pesticide in insect pest control is essential for optimizing alfalfa (Medicago sativa) seed yield. This field experiment was designed to test the effects of pesticide application on alfalfa seed yield, yield components and insect pest. The results indicated that the treatment of applying pesticide at the budding stage and podding stage increased seed yield by 134%, and also significantly increased racemes per stem, pods per raceme, and seeds per pod, compared with CK (no pesticide application). And only applying pesticide at the budding stage decreased the negative effects of insect pest on seed yield, and led to higher seed yield than that of only applying pesticide at the podding stage. Correlation analysis revealed a significant positive relationship between racemes per stem and seed yield as well as between pods per raceme and seed yield under the treatments of pesticide application in insect pest control (P＜0.05).%正确使用农药防治紫花苜蓿Medicago sativa害虫是获得高种子产量的重要技术措施.试验研究了不同防治措施对种子产量、产量构成和主要害虫的影响.结果表明:与不喷药防治处理相比,在现蕾期和结荚期喷药防治处理提高种子产量134%,显著提高了结荚花序数/枝条、荚果数/结荚花序和种子数/荚果;与结荚期喷药防治相比,现蕾期喷药防治显著提高了种子产量,更加有效地减少了害虫对种子产量的负面影响,具有更为重要的作用.相关分析表明,在不同喷药处理下,结荚花序数/枝条与种子产量、荚果数/结荚花序与种子产量之间存在显著的正相关关系(P＜0.05).
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