十七、保“幼”绝“育”我国科技工作者早在二十世纪中叶就试验成功了以虫防虫、以菌治虫的技术,研制了青虫菌、白僵菌、绿僵菌、杀螟杆菌、苏云金杆菌等生物农药,为控制螟虫、棉铃虫、菜青虫、松毛虫等许多害虫的发生作出了卓越的贡献。近年来,科研工作者先后研制了昆虫几丁质 Seventeen, to protect the “young” must “educate” As early as the mid-twentieth century, China’s scientific and technological workers to test the success of the pests and insect pest control bacteria, the research and development of the worm, Beauveria bassiana, Metarhizium, Bacillus, Bacillus thuringiensis and other biological pesticides, for the control of stem borers, cotton bollworm, cabbage caterpillar, pine caterpillars and many other pests have made outstanding contributions. In recent years, researchers have developed insect chitin