紫花苜蓿Medicago sativaL.属多年生豆科牧草,是饲养奶牛的优质粗饲料。近年来随着我国畜牧业的发展,苜蓿种植面积不断扩大。在南方,受凉湿气候和土壤条件影响,苜蓿菌核病已蔓延成灾。腐霉利为一种内吸低毒杀菌剂,起着保护、治疗双重作用。张薇等[1]研究指出50%腐霉利可湿性粉 Alfalfa Medicago sativa L. is a perennial legume forage that is a good quality forage for dairy cows. In recent years, with the development of animal husbandry in our country, alfalfa planting area has been expanding. In the south, due to the effects of cold and wet climates and soil conditions, alfalfa sclerotinia has been spread. Pythium Lee is a low toxicity germicide, which plays a dual role in protection and treatment. Zhang Wei et al [1] study pointed out that 50% of pythium lyophilized powder