pesticide, the world's unified English name is pesticide- that is, "killing agent", but in fact the so-called pesticide refers to the control of agricultural and forestry production of harmful organisms (pests, mites, nematodes, pathogens, weeds and rats. Later, through the long-term development of production and life process, gradually realized that some natural control of pests in agriculture and animal husbandry performance. To Class 17, etc.) and chemicals and biological drugs that regulate plant growth. Various auxiliaries used for hygiene and to improve the physical and chemical properties of active ingredients are also commonly included.