How to treat diseases and insect pests of red-leaf plum? What is the disease in the picture? Can you give me an answer? Thank you.

Preventive and control measures:

1. strategy: mainly grasp two links. The first is the prevention and control of host dormancy and when a large number of nymphs hatch and transfer during the host growth period or when a large number of overwintering nymphs burst out.

2, prevention and treatment of dormancy, combined with scraping and pruning in winter and spring, cut off branches with insects and concentrate on destruction. Or scrape the overwintering scale insects off the branches manually, and spray 3-5 times of Be-sulfur mixture, turpentine mixture 15 times and 15% diesel emulsion 1000 times before germination in spring.

3. Growth period control: spraying 40% chlorpyrifos EC 1000 times, 40% omethoate EC 1500 times, 50% dichlorvos EC 1000 times, 50% monocrotophos EC 1800 times, 0.3 times.

4. Protect and utilize natural enemies, especially ladybugs, and adjust the application period and method to avoid killing natural enemies.

5, a few rare flowers and trees have this insect, in the nymph and adult fixation damage period, can be brushed off with a fine wire brush.