从本世纪四十年代开始广泛使用化学农药以来,现在面临两个难题:一是农药对环境污染日趋严重,生态平衡遭到破坏;另一个是害虫对农药产生抗性。因此,从维护生态平衡观点出发,探索新的防治途径有着现实而深远的意义。昆虫病毒寄主专一性很强,对生态系内外有害的副作用可能是极小 Since the widespread use of chemical pesticides from the 1940s onwards, they now face two problems: First, the pollution of the environment is aggravated by pesticides and the ecological balance is destroyed; and the other is the resistance of pests to pesticides. Therefore, it is of practical and far-reaching significance to explore new ways of prevention and control from the viewpoint of maintaining ecological balance. Insect virus hosts are highly specific and may have minimal side effects that are harmful both inside and outside the ecosystem