Some replications were made: firstly, the feces or tree cuttings blocked in the wormhole of the damaged plant were hooked out with a long iron hook, and then the whole plant was poured thoroughly with 600-800 times of 45% propargyl phoxim solution or 1000 times of 40% chlorpyrifos solution, so that the chemical solution penetrated into the stem to kill the pests (if an adult or larva crawled out of the wormhole during irrigation, it was immediately caught and burned).

I suggest you check the control methods of red-brown weevil. In addition to the above, there are some useful information worth learning.