书中把有害植物分为促癌植物、剧毒植物、有毒植物、小毒植物、过敏植物等；这些植物，有的是再熟悉不过的切花，常被我们插摆在居室之中；有的是道路绿化或园林布置的常选品种，常在各种人工景观中见到。
实践证明，低耕农业提高了作物产量，减少了用水量；而且，由于有害植物变少了，这种农业对化工产品的需求也降低了。
It has been proved that Low Till Farming increases harvests and reduces water use, and this method reduced the need for chemical products because there are fewer unwanted plants.
城市的环境污染确实有害植物生长，更不要说人的生活了。
Cities are full of pollution, and it does have a detrimental effect on plant life-to say nothing of people life!
文章探讨了林业有害植物的概念及其在山西省的危害，提出对外来有害植物的预防及管理对策。
The article probes into the concept of harmful forestry plants and their harms to Shanxi and proposes some measure to prevent and control alien harmful plants.
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