What kind of bug is this? White. That's disgusting.

This is a scale insect disease: Lagerstroemia indica.

Scale insects are an important pest group of garden plants. The main characteristics of this group are: small or tiny insects, hidden life, fast reproduction and wide host range. This kind of pests not only do direct harm to the host by female adults and nymphs sucking juice on the branches, stems, leaves and fruits of plants, but also secrete a lot of dense dew to induce sooty blotch and affect the photosynthesis of the host. Because insects are covered with white powder or wax, it is quite difficult to control them. The common species are Eriocheir sinensis, Eriocheir Lagerstroemia, Eriocheir sinensis, Eupolyphaga sinensis, Eupolyphaga sinensis, Eriocheir sinensis, Eupolyphaga sinensis, Eupolyphaga sinensis and Eupolyphaga sinensis.

Prevention and control methods:

1, manual control. When there are few insect mouths, the branches with insects can be cut off, or the insect bodies can be washed with brushes and washing powder water to focus on eliminating the branches with insects.

2. Landscape technology control. Combined with pruning and shaping, cut off damaged branches; Strengthening water and fertilizer management can promote the healthy growth of trees and enhance the resistance of plants to scale insects.

3. Chemical control. A, scraping a branch ring with a width of about 25cm on the trunk during the occurrence period of young nymphs, and then coating 40% omethoate stock solution; B, spraying 40% chlorpyrifos EC 1000 times, 25% chlorpyrifos EC 1000- 1500 times or 100% imidacloprid EC 1000 times and 654,300 times during the peak period of newly hatched nymphs.