烟草是一种茄科植物。它的杀虫成分是烟碱。我国普遍栽种的是烟碱合量较低、专供卷烟吸用的红花烟草。烟碱含量较高、专供提制杀虫剂用的烟草是黄花烟草和白花烟草。烟草中有10余种植物碱具有杀虫功能,其中最主要的是烟碱。烟草的整个植株都含有烟碱,但以叶中含的最多,茎中含的最少,愈老的烟叶含烟碱愈多。做卷烟的红花烟草含烟碱3%左右,黄花烟草含烟碱10%～15%。烟 Tobacco is a solanaceous plant. Its insecticidal ingredient is nicotine. Generally planted in our country is a lower nicotine content, specifically for tobacco smoking tobacco. Higher nicotine content, specifically for the preparation of pesticides used tobacco is yellow tobacco and white tobacco. Tobacco has more than 10 kinds of plant alkaloids insecticidal function, the most important of which is nicotine. The entire plant of tobacco contains nicotine, but the most is contained in the leaves, the least in the stems, and the older the tobacco contains more nicotine. Red tobacco made cigarettes containing about 3% nicotine, yellow tobacco containing nicotine 10% to 15%. smoke