杂草不仅主要指草本植物,还包括灌木、藤本及蕨类植物等,这些长错了地方的野生植物都是杂草。杂草危害农作物和经济作物,它们与作物争肥、争水、争光照,有些杂草还是作物病虫害的寄主和越冬的场所。据调查,世界范围内的农业生产每年受杂草危害损失达10%左右,仅美国每年由于杂草造成的谷物损失就达90～100亿美元。我国因遭受杂草的危害,每年损失粮食 Weeds not only refers mainly to herbs, but also includes shrubs, rattan and ferns, etc., where the wild plants in the wrong place are weeds. Weeds endanger crops and cash crops, fight over crops with crops, fight for water, win glory, and some weeds are host to crop pests and wintering places. According to the survey, worldwide agricultural production is harmed by weeds every year by about 10%. Only the cereal losses caused by weeds in the United States each year have reached 90-10 billion U.S. dollars. Due to the damage weeds in our country, we lose food every year