I'm not sure what you mean by "how to treat the Chinese prickly ash tree". If the tree is diseased or pest - infested:
If it's a fungal disease, you can use fungicides. Spray a suitable fungicide on the tree according to the product instructions to control the spread of the fungus.
For pest problems, like aphids, you can use insecticidal soaps or neem oil. These natural substances can be sprayed on the tree to kill the pests. Make sure to cover all parts of the tree where pests are likely to be present.
If the tree is not growing well, it may need proper fertilization. Use a balanced fertilizer, such as one containing nitrogen, phosphorus and potassium, to provide the necessary nutrients for its growth and health.
