紫花苜蓿是优质的多年生豆科牧草,因其营养丰富,适口性良好,产量高,在畜牧业发展中起着重要作用,被称作“牧草之王”。近年来随着畜牧业的发展,黑龙江省苜蓿的种植面积不断扩大。然而,由于种植面积的扩大、种植年限的增加以及引种等因素,苜蓿病害在黑龙江省时有发生,造成生产上 Alfalfa is a high-quality perennial legume that has been known as the “king of pastures” because of its nutrient richness, good palatability and high yield, which play an important role in the development of animal husbandry. In recent years, with the development of animal husbandry, the planting area of ​​alfalfa in Heilongjiang Province has been continuously expanded. However, due to the expansion of planting area, the increase of planting years and the introduction of other factors, alfalfa diseases occur frequently in Heilongjiang Province, resulting in production