Relying on the damage and actual production, six occurrence amount degrees of brome were provided, i.e.0,1,2,3,4,5.The brome occurrence amount in different type fields and the related controlling methods were also provided.

• 根据危害损失和生产实际,将雀麦发生程度区分为0、1、2、3、4、5六个等级,提出了不同类型麦田雀麦发生量和应采取的防除策略;