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1苜蓿病虫害发生、分布规律苜蓿病害主要有苜蓿褐斑病、苜蓿霜霉病、苜蓿白粉病、苜蓿锈病、苜蓿匍柄梅叶病、苜蓿花叶病、苜蓿春季黑茎病、苜蓿黄萎病、苜蓿炭疽病、苜蓿菌核病和苜蓿根腐病等30余种,大范围发生并引起灾害性损失的主要有苜蓿褐斑病、苜蓿霜霉病、苜蓿白粉病和苜蓿根腐病。
1 alfalfa pests and diseases, the distribution of alfalfa disease mainly alfalfa brown spot, alfalfa downy mildew, alfalfa powdery mildew, alfalfa rust, alfalfa stalk Merlot, alfalfa mosaic disease, alfalfa spring black stem disease, alfalfa wilt , Alfalfa anthracnose, alfalfa sclerotinia and alfalfa root rot more than 30 species, the occurrence of large-scale and cause catastrophic losses of alfalfa brown spot, alfalfa downy mildew, alfalfa powdery mildew and alfalfa root rot.