蔬菜是农产品的一个重要组成部分,是人们日常生活不可缺少的副食品。为城乡人民供应优质的“无公害”蔬菜是当前蔬菜生产上急待解决的重要课题。 一、“无公害”蔬菜生产的意义 蔬菜品种繁多,柔嫩多汁,生长期短,复种指数高,土地休闲机会少,比其它农作物更有利多种病菌和害虫的滋生发展。长期以来,菜农习惯用单一的化学农药进行防治,虽然取得了一定的效果,但也带来一系列的副作用,杀伤了天敌,破坏了生态环境,失去了生物因子抑制害虫和病菌的作用,病虫抗药性明显增强,用药量日趋增 Vegetables are an important part of agricultural products and are indispensable food for people in their daily life. The supply of quality “pollution-free” vegetables to urban and rural people is an urgent issue to be solved in the current vegetable production. First, the significance of “pollution-free” vegetable production A wide variety of vegetables, tender and juicy, short growth period, multiple crop index high, fewer opportunities for land recreation, more favorable than other crops breeding of a variety of germs and pests. For a long time, vegetable farmers accustomed to using a single chemical pesticides for prevention and treatment, although achieved some results, but also brought a series of side effects, killing natural enemies, destroying the ecological environment, loss of biological factors inhibit the role of pests and bacteria, the disease Insect resistance was significantly increased, the dosage increased