一、定义与危害杂草实际上就是长错了地方的野生植物。因为对于人类的经济活动而言,没有绝对的所谓“杂”或“莠”。比如香附子是一种恶性杂草,但它的块茎是著名的中药,能疏肝理气。白茅也是一种恶性杂草,其根可入药,能清热、利尿、止血。杂草对农作物的危害所造成经济上的损失是十分巨大的,如美国每年花费在除草方面的费用高达几十亿美元。中国有15亿亩耕 First, the definition and damage Weeds are actually the wrong place where the wild plants. Because there is no absolute so-called “miscellaneous” or “ametry” for human economic activities. Such as Cyperus rotundus is a vicious weed, but its tubers are famous Chinese medicine, can Shugan Qi. Imperata is also a malignant weed whose roots can be used as medicine to heat, diuretic and stop bleeding. The economic costs of weed damage to crops are enormous, as the United States spends billions of dollars a year on weeding. China has 1.5 billion mu of land