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生产无公害蔬菜,在农业、生物、物理和生态等防治方法无法控制病虫时,也可及时合理使用一定的化学农药,使用时须切实做到以下四点: 1、不打保险药 要调查掌握病虫发生规律,针对病菌、害虫对药剂抵抗力薄弱的环节适时施药,既可减少防治次数,又能收到最佳防治效果。绝不能盲目打保险药,三天一小打,七天一大打,打得病虫没有了,而蔬菜也受到了农药的严重污染,还增加了生产成本。 2、改进防治技术 若在温室大棚
Production of pollution-free vegetables in the agricultural, biological, physical and ecological control methods such as pests and diseases can not be controlled, but also the timely and rational use of certain chemical pesticides, the use must be effective to achieve the following four points: 1, without insurance drugs to investigate Grasp the occurrence of pests and diseases, for germs, pests on the drug resistance of weak links in a timely manner, can reduce the number of control, but also received the best control effect. Never blindly play insurance drugs, three days and a dozen, seven days a fight, hit the pests gone, and vegetables have also been severely polluted by pesticides, but also increased production costs. 2, if the technology to improve prevention and control greenhouse