Biological control method of longhorn beetles on trees

The invention belongs to the technical field of longhorn beetle control and specifically discloses a biological control method of longhorn beetles on trees. The method comprises following steps: applying longhorn beetle larva control agent in the larva stage; applying longhorn beetle pupa control agent in the pupa stage; applying longhorn beetle imago control agent in the imago eclosion hole stage; in this way, the control of longhorn beetles on trees is completed; the longhorn beetle larva control agent is prepared from beauveria bassiana spore liquid, Sichuan azedarach extract, ethanol, and emulsifier; the longhorn beetle pupa control agent is prepared from beauveria bassiana spore liquid, adonis aestivalis extract and ethanol; the longhorn beetle imago control agent is prepared from beauveria bassiana spore liquid, hydrogen peroxide, ethanol and adonis aestivalis extract. According to the method of the invention, beauveria bassiana spore liquid is adopted as biological source for controlling longhorn beetl