乳浆大戟是我国草原及北美大平原上的一种恶性杂草，有广泛的分布，特别是在草原地区传播、蔓延、侵占草场，取代有经济价值的植物种群。由于该草终生有毒，无放牧及饲用价值，给草地畜牧业造成不良影响，使草地生态条件恶化，生产力下降。因此，寻找安全、经济、有效的防治措施和方法，是很有必要的。在近年的杂草天敌资源调查研究中，我们发现了寄生于乳浆大戟上的重要病原物——大戟栅锈菌，该菌寄主范围狭窄，专化性、致病性强，常可引起恶性杂草乳浆大戟的苗期或成株期的植株枯萎死亡。从控制乳浆大戟草危害这个角度看，该菌是一种有重要研究和应用价值的杂草天敌资源。 Herba Euphorbia is a kind of malignant weed on grassland and North American plains. It has a wide range of distribution, especially spread in the grassland, spreading and encroaching on the pasture and replacing the economically valuable plant population. Due to the poisonous life of the grass, no grazing and fodder value, which adversely affects grassland husbandry, degrading grassland ecological conditions and reducing productivity. Therefore, it is necessary to find safe, economical and effective prevention measures and methods. In recent years, weaver natural enemy resources research, we found that the parasitic in Escherichia coli important pathogens - Euphorbia euphorbia rust, the host host range narrow, specialization, pathogenicity, often Plants that cause the weeds or adult plants of the malignant weed cream Euphorbia wilted and died. From the point of view of controlling the harm of the crude extract of Euphorbia, the fungus is a weed natural enemy resource with important research and application value.