采用化学方法防治粮食、蔬菜、瓜果、花卉、茶叶、苗术、药草、草坪等发生的病虫害,或者用其进行化学除草,是目前使用最广、也最为有效的方法。然而在农药的包装标贴或说明书中,往往掺杂有不少英文字母或符号,用以表示农药的剂型、浓度、可湿性、密度、重量、毒性、药性、用法硬有效剂量等,而不少种植专业户,对这些符号或字母又不甚了解,从而影响了农药的正确使用,甚至产生意外药害造成不应有的经济损 It is the most widely used and most effective method to prevent and control the diseases and pests of foodstuffs, vegetables, fruits, flowers, tea leaves, seedlings, herbs and lawns by chemical methods or to use them for chemical weeding. However, in pesticide packaging labels or instructions, often mixed with a lot of English letters or symbols, to indicate the pesticide dosage forms, concentrations, wettability, density, weight, toxicity, drug usage, hard dose, etc., Less planting specialized households, these symbols or letters do not quite understand, thus affecting the correct use of pesticides, and even accidental injury caused by unnecessary economic losses