长效敌虫块是由敌敌畏和聚氯乙烯等原料制成,是一种控制释放敌敌畏气体,保持长期药效的新剂型。这种类型的缓释剂在国外已有近二十年使用历史。在我国六十年代初期生产敌敌畏农药以来,也广泛用于防治仓库、卫生和农业害虫。在储粮害虫防治上目前仅用作空仓杀虫,以及配合实仓熏蒸杀死空间害虫。在应用技术和改进剂型方面曾进行了不少研究工作,取得了一定的效果。诸如各种塑料袋和乳 Long-lasting worm block is made of raw materials such as dichlorvos and polyvinyl chloride, is a new form of controlled release of dichlorvos gas, to maintain long-term efficacy. This type of sustained-release agent has been used abroad for nearly two decades. Since the production of dichlorvos in the early 1960s in our country, it has also been widely used in the control of storage, hygiene and agricultural pests. Pest control in the stored grain is currently used for short positions insecticide, as well as with the real warehouse fumigation to kill space pests. In the application of technology and improve the dosage form has conducted a lot of research work, and achieved some results. Such as a variety of plastic bags and milk