What are the many small white things growing on the trunk of the money tree? What should be done?

I can’t see the details clearly in this photo. At a rough glance, it looks like a scale insect. It is a pest and needs to be killed in time.

Scale insects, also known as "scale insects". Scale insects are important pests on citrus and grapefruits. Common scale insects include red round scales, brown round scales, Kangxi scales, sagittal scales and blowing scales. Scale insects damage leaves, branches and fruits. Male scale insects are often winged and can fly. Once the females and larvae emerge, they live on branches, leaves or fruits for life, causing yellowing of leaves, withering of branches, decline of tree vigor, and easily inducing sooty stains.

Based on the morphological characteristics of scale insects, the first choice for the control of this type of pests is pesticides with super strong systemic and penetrating effects, such as "Scale Must Control" sprayed with 750 to 1000 times of liquid. After being absorbed by the tree, the scale insects suck the poisonous tree sap and are poisoned to death. The insecticidal effect is good. It is recommended to use the medication in the afternoon when the temperature is relatively high (required to be between 28°C and 32°C, so the temperature solution conducts quickly and scale insects are easily poisoned, and the wax layer becomes soft at this temperature, which is conducive to the penetration of the solution into the insect body). Spray twice, with an interval of 5 to 7 days. For tall trees that are difficult to spray with pesticides, you can punch holes in the middle and upper part of the trunk to inject "tree insecticides". The liquid is transported to the top through xylem conduits. For trees with large age, thick wax layer and difficult-to-reach trees, The scale insect control effect is obvious, the operation is simple, and the control is thorough.