1、 Whitefly

1. Harm: after the emergence of whitefly, it will suck the juice inside on the back of the leaves, dry the leaves, cause the leaves to turn yellow and fall down, and there will be a large area of black powder on the stems and leaves, which will affect the ornamental value and look very unsightly

2. Prevention and control: it is very likely that whitefly is too muggy. This aspect needs to be improved and good ventilation conditions should be given. Also spray it with the diluted solution of 40% Omethoate EC, or mix dimethoate with dichlorvos 1000 times. After the agent is sprayed, the black powder on it can be washed down with strong water flow

2、 Scale insects

1. Harm: This is a very common pest, with high incidence in early spring. It is mainly to lie on the stem and leaf part and suck the juice inside. This part will also have poor growth. When it is serious in the later stage, it may cause the withering and death of tiger thorn plum, which has a great impact

2. Prevention and treatment: when the quantity is small, you can brush down with a small brush and remove it manually. They should also be sprayed with 800-1000 times of fast killing liquid in combination with drugs. They can also be sprayed with self-made ashtray water