What should longicorn larvae do if they eat branches?

Dichlorvos, chlorpyrifos, phoxim, cypermethrin, deltamethrin and fenpropathrin can kill longicorn larvae. Using a syringe to suck out the liquid medicine and then inject it into the wormhole destroyed by the beetle larvae, or dipping the liquid medicine with cotton and then stuffing it into the wormhole destroyed by the beetle larvae can poison the beetle larvae in the wormhole.