What about the worm eye of the tree-shaped rose trunk?

It could be a bug. The larvae of the rose stem bee drill holes in the stem and drill into the stem to eat, which leads to the branch breaking and the upper part dying. Larvae is white with yellowish head, and its body length is about15-17mm. Adults have wings, a black body and a yellow abdomen. Pupa cinnabar. Usually, 1 generation occurs in 1 year, and the damage occurs in May-June, with pupae overwintering in the stem, which is a harmful pest.

First of all, you should carefully observe whether it is this kind of bug. If so, 1) cut off the upper part from the bottom of the worm to the place where there is no moth-eaten trace, and kill the worm. 2) When the first generation emerged after May, spray 1000- 1200 times 50% chlorpyrifos EC to kill the adults. 3) Spraying dichlorvos EC 1200- 1500 times, or 50% phoxim EC 1000- 1500 times, or 2500-3000 times of 20% pyrethroid EC to kill insects.