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麦类黄矮病主要发生在大麦、小麦及燕麦上,在我国则以小麦上的为害较显著,故称小麦黄矮病。是由麦蚜(主要是麦二叉蚜)传毒引起的一种病毒病,对小麦的产量影响较大,轻发生年份小麦产量损失率为3%～5%,中度流行年份损失率为20%～30%,大流行年份损失率30%～50%,个别病重田块的损失率可达60%以上。
Wheat yellow dwarf disease occurs mainly in barley, wheat and oats in China is more significant damage on wheat, so wheat yellow dwarf disease. Is a virus disease caused by the wheat aphid (mainly wheat aphid), which has a great impact on the yield of wheat. The yield loss rate of wheat in light years is 3% ~ 5%. The annual loss rate of moderate prevalence is 20% -30%, the annual loss rate of the pandemic will be 30% ~ 50%, and the loss rate of the individual field will reach more than 60%.