随着畜牧养殖业的快速发展,尤其是奶牛养殖的迅速崛起,对牧草的需求越来越突出。紫花苜蓿种植快速发展起来,面积成倍增长。但由于紫花苜蓿生长过程中病虫害的发生及不恰当的防治,往往引起叶片出现病斑甚至脱落、茎叶枯黄、植株萎蔫,或叶片残缺、生长不良,导致苜蓿产草量下降、品质变劣、利用年 With the rapid development of livestock husbandry and aquaculture, especially the rapid rise of dairy farming, the demand for forage grass is becoming more and more prominent. The rapid development of alfalfa cultivation, the area doubled. However, due to the occurrence of pests and diseases and the improper prevention and control of alfalfa growth process, it often leads to leaf spots or even fall off, yellowish stems and leaves, wilting of plants, or incomplete leaves, poor growth, resulting in decreased yield and quality of alfalfa, Use years