杂草给人类带来了很大的危害,它同作物争阳光、争水分和养分。有些杂草是作物病虫害的中间寄主,帮助病虫害蔓延与传播。甚至有些杂草本身或其种子是有毒的,人、畜食后能引起中毒,甚至死亡。据联合国粮食与农业组织估计,世界农业生产因受草害约减产10％。我国的杂草为害 Weeds have brought great harm to human beings, it competes with crops for sunshine, fight water and nutrients. Some weeds are intermediate hosts of crop pests and diseases and help spread and spread pests. Even some of the weeds themselves or their seeds are poisonous, humans and livestock can cause poisoning and even death. According to the UN Food and Agriculture Organization, the world’s agricultural production has been cut by about 10% due to grass weeds. Our weeds are harmful