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小麦黄矮病是由二叉蚜和麦长管蚜等蚜虫传播的一种病毒病。该病的发生流行与蚜虫种群的消长关系密切,并受气候的影响,一般冬季暖而干燥有利于蚜虫的增殖扩散。贵德县现处于冬春麦混种区,春麦的虫源、毒源,有可能来自冬麦,成为春麦的浸染源。贵德县从1998年到2002年每年有2000公顷左右的黄矮病发生面积,平均每年造成约200吨的小麦损失。最严重的是2000年,小麦黄矮病大面积发生,发病率达 94%,发生面积3000公顷,当年因此而造成的粮食损失达280吨。从2003年开始,小麦黄矮病的发生和危害逐步得到控制。
Wheat yellow dwarf is a virus disease that is spread by aphids such as aphids and aphids. The prevalence of the disease is closely related to the decline of the aphid population, and is affected by the climate. Generally, it is warm and dry in winter, which is beneficial to the proliferation and spread of aphids. The county is now in winter and spring wheat mixed area, spring wheat insect source, source of poison, may come from winter wheat, become the source of spring wheat. In Gude County, about 2,000 hectares of yellow dwarf disease occur each year from 1998 to 2002, causing an average annual loss of about 200 tons of wheat. The worst is that in 2000, a large area of wheat yellow dwarf disease occurred, with a prevalence of 94% and an area of 3000 hectares, resulting in a loss of 280 tons of grain during the year. Since 2003, the occurrence and harm of wheat yellow dwarf virus has been gradually controlled.