The base of the open side of Lamei has beige granules and small wormholes. What kind of insect harm is it? How to prevent and cure

It should be caused by the trunk of the larvae of the leopard beetle moth. The pest sneaked into the branches as early as summer and autumn, but was not found in flower selection. after it was brought back, the temperature changed and the insect began to become active.

Control method: when the branches of ① have dried up, they should be cut off, and the worms should be found and killed along the underpass. ② removes wormhole excreta, injects 50% fenitrothion EC 800-1000 times into the hole with a medical needle; it can also use 80% dichlorvos EC 200-fold solution, dipped in cotton balls to block wormholes, go deep into the tunnel and seal with wet mud, which has a good insecticidal effect.